Ford OBD1 Codes List (Free Download PDF)
Is your Ford vehicle experiencing performance issues or displaying the dreaded “check engine” light? Don’t panic – our complete Ford OBD1 codes list is here to help.
Whether you’re a professional mechanic or a Ford owner, our list is the ideal resource for diagnosing and troubleshooting issues with your vehicle.
With detailed descriptions, you can decode OBD1 codes and confidently get your Ford back on the road.
So, let’s get started!
Our Complete List Of Ford OBD1 Codes
Free Download: A complete Ford OBD1 Trouble Codes List PDF
Note: To read the Ford OBD1 codes list table on your mobile device, swipe left or right to scroll through the codes and their descriptions.
This Ford OBD1 codes list is divided into two parts: 2-digit codes and 3-digit codes as below:
2-Digit Ford OBD1 Codes
| Code | Definition |
|---|---|
| Code 11 | System OK |
| Code 12 | Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too low) – ISC |
| Code 13 | ISC did not respond properly (extends to touch throttle then retracts for KOEO) – ISC |
| Code 13 | Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too high) |
| Code 13 | ISC sticking, open ITS circuit or TP sticking |
| Code 14 | Ignition pickup (PIP) was erratic – Ignition Systems |
| Code 14 | E4OD Transmission diesel RPM sensor – Diesel RPM sensor |
| Code 15 | No Keep Alive Memory power to PCM pin 1 or bad PCM (Memory Test Failure) |
| Code 15 | KAM (pin 1) was interrupted (was battery disconnected ?) |
| Code 16 | 1 9L & 2 5L – Throttle stop set too high – IDLE or Idle Set Procedures |
| Code 16 | 2 3L – RPM’s too low – IDLE |
| Code 16 | Electronic ignition – IDM circuit fault – Ignition Systems |
| Code 17 | 1 9L & 2 5L – Throttle stop set too low – IDLE |
| Code 18 | Check base timing & advance function – Timing Tests |
| Code 18 | Ignition TACH signal erratic – Ignition Systems |
| Code 18 | Spark Angle Word (SAW) circuit failure (1 9L SFI) |
| Code 19 | No Vehicle Power (pins 37 + 57) or bad PCM VPWR Diagnosis |
| Code 19 | Erratic idle during test (reset throttle & retest) – Idle Set Procedures |
| Code 19 | Electronic ignition Cylinder ID sensor/circuit problem – Ignition Systems |
| Code 20 | Cylinder #2 failed cylinder balance test |
| Code 21 | Engine Coolant Temperature (ECT) sensor out of range – ECT |
| Code 22 | MAP (vacuum) or BARO signal out of range – MAP |
| Code 23 | Throttle sensor out of range or throttle set too high – TPS |
| Code 24 | Intake Air Temperature (IAT) or Vane Air Temperature (VAT) sensor out of range – IAT VAT |
| Code 25 | Knock sensor not tested (ignore if not pinging) – KS |
| Code 26 | Mass Air Flow (MAF) or Vane Air Flow (VAF) out of range – MAF VAF |
| Code 26 | Transmission Oil Temperature (TOT) sensor out of range, Transmissions |
| Code 27 | Vehicle Speed Sensor problem – VSS |
| Code 28 | Vane Air Temperature (VAT) sensor out of range – VAT |
| Code 28 | 2 3L w/Electronic Ignition – Cyl ID, IDM low or right coil pack failure – Ignition Systems |
| Code 29 | Vehicle Speed Sensor problem – VSS |
| Code 30 | Cylinder #3 failed cylinder balance test |
| Code 31 | EVP – EVP signal is/was out of range – EVP |
| Code 31 | EVR – EVP signal is/was low – EVR |
| Code 31 | PFE – PFE signal is/was low – PFE |
| Code 32 | EVP – EGR not responding properly during test – EVP |
| Code 32 | EVR – EVP signal is/was low – EVR |
| Code 32 | PFE – PFE shows low pressure, EGR not seating or memory, not seating intermittently – PFE |
| Code 33 | ALL – EGR did not open/ respond during test or if memory code, did not open intermittently – EVP EVR PFE |
| Code 34 | EVP – EGR did not respond properly during test – EVP |
| Code 34 | EVR – EVP sensor is/was high – EVR |
| Code 34 | PFE – PFE sensor is/was out of range – PFE |
| Code 35 | EVP – Engine RPM’s too low to test EGR system – EVP |
| Code 35 | EVR – EVP sensor signal is/was high – EVR |
| Code 35 | PFE – PFE sensor signal is/was high – PFE |
| Code 38 | Idle Tracking Switch signal was intermittent – ISC |
| Code 39 | Transmission Torque Converter clutch not engaging – Transmissions |
| Code 40 | Cylinder #4 failed cylinder balance test |
| Code 41 | System lean – Fuel control |
| Code 41 | System was lean for 15 seconds or more (no HO2S switching) – Fuel control |
| Code 42 | System rich – Fuel control |
| Code 42 | System was rich for 15 seconds or more (no HO2S switching) – Fuel control |
| Code 43 | HO2S sensor not reading (run at 2000 rpm’s for 2 minutes and retest – check for HO2S switching) |
| Code 43 | Was lean at WOT for 3 seconds or more – Fuel control |
| Code 44 | AIR system inoperative – Air Injection |
| Code 45 | AIR not Diverting (AIRD) – Air Injection |
| Code 45 | Electronic Ignition – coil primary circuit failure – Ignition Systems |
| Code 46 | AIR Bypass (AIRB) not working – Air Injection |
| Code 46 | Electronic Ignition – primary circuit failure coil 2 – Ignition Systems |
| Code 47 | Low flow unmetered air (check for small vacuum leaks, injector o’rings, gaskets etc ) |
| Code 47 | E4OD transmission 4×4 switch/circuit problem – Transmissions |
| Code 48 | High flow unmetered air (check for large vacuum leak, inlet hoses etc ) |
| Code 48 | Electronic Ignition – coil primary circuit failure – Ignition Systems |
| Code 49 | Electronic Ignition – spout signal circuit problem – Ignition Systems |
| Code 49 | Transmission 1/2 shift problem – Transmissions |
| Code 50 | Cylinder #5 failed cylinder balance test |
| Code 51 | Engine Coolant Temperature (ECT) sensor signal is/was too high – ECT |
| Code 52 | Power Steering Pressure Switch/circuit open – PSP |
| Code 52 | Did you turn wheel during test ? |
| Code 53 | Throttle Position sensor too high – TPS |
| Code 54 | Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal high – IAT VAT |
| Code 55 | No or low (under 7 5 V) Key Power to PCM pin 5 |
| Code 56 | Vane Air Flow (VAF) or Mass Air Flow (MAF) sensor high – VAF MAF |
| Code 56 | Transmission Oil Temperature sensor too high – Transmissions |
| Code 57 | Intermittent in Park/Neutral/ Switch or Neutral Pressure switch circuit – PNP or Transmissions |
| Code 58 | Idle Tracking Switch (ITS) signal problem ISC |
| Code 58 | Vane Air Temperature (VAT) sensor out of range or open – VAT |
| Code 59 | AXOD 4/3 circuit fault – Transmissions |
| Code 59 | 3 0L SHO – Low speed fuel pump circuit problem – Power / Fuel Pump Circuits |
| Code 59 | Transmission 2/3 shift problem – Transmissions |
| Code 60 | Cylinder #6 failed cylinder balance test |
| Code 61 | Engine Coolant Temperature (ECT) sensor is or was too low – ECT |
| Code 62 | AXOD (KOEO only) 3/2 circuit short to ground – Transmissions |
| Code 62 | AXOD (KOEO AND KOER) 4/3 circuit failure – Transmissions |
| Code 62 | E4OD excessive converter clutch slippage – Transmissions |
| Code 63 | Throttle Position Sensor (TPS) signal too low TPS |
| Code 64 | Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded – IAT VAT |
| Code 65 | Check intermittent HO2S (signal or ground) – Fuel Control |
| Code 65 | E4OD truck – cycle OD cancel switch after engine ID is received – Transmissions |
| Code 65 | 1984 3 8L ONLY – O, M Battery voltage high (check for electrical system overcharging) |
| Code 66 | Vane Air Flow (VAF) or Mass Air Flow (MAF) signal low – VAF MAF |
| Code 66 | Transmission Oil Temperature (TOT) signal low (possibly grounded) – Transmissions |
| Code 67 | Park/Neutral circuit fault – PNP |
| Code 67 | Transmission Manual Lever Position (MLP) sensor circuit – Transmissions |
| Code 67 | Intermittent Park Neutral Position (PNP) sensor fault – PNP |
| Code 68 | Idle Tracking Switch (ITS) circuit (possibly grounded) – ISC |
| Code 68 | Vane Air Temperature (VAT) sensor out of range or grounded – VAT |
| Code 68 | 3 8L AXOD -Transmission Temperature Switch (TTS) open – Transmissions |
| Code 68 | Electronic Transmission – Transmission Oil Temperature (TOT) sensor was overheated -Transmissions |
| Code 69 | AXOD transmission (O) 3/2 switch closed (possible short circuit) – Transmissions |
| Code 69 | AXOD (M) 3/2 switch open (poss short to power) – Transmissions |
| Code 69 | E4OD 3/4 shift problem – Transmissions |
| Code 70 | 3 8L AXOD – Data link to instrument cluster fault Service any other EEC codes, erase memory and retest If code is still present refer to instrument cluster diagnosis manual |
| Code 71 | 1 9L TBI, 2 3L TBI, 2 5L TBI – ITS signal was grounded when throttle should have been opening ITS-ISC ISC motor problem or Idle Tracking Switch (ITS) signal wire shorted to ground – ISC |
| Code 71 | 1 9L MFI – PCM re-initialized Possible electrical noise, case ground or intermittent VPWR problem – VPWR Diagnosis |
| Code 71 | 3 8L AXOD – Data link to instrument cluster fault – See code 70 |
| Code 72 | No MAP or MAF change in “goose” test – retest, check for frequency or voltage change – MAP MAF |
| Code 72 | 1 9L MFI – VPWR circuit to PCM was intermittent – VPWR Diagnosis |
| Code 72 | 2 3L T/C – PCM re-initialized Possible electrical noise, case ground or intermittent VPWR problem – VPWR Diagnosis |
| Code 72 | 3 8L AXOD – Message center data link circuit fault – See code 70 |
| Code 73 | Rerun test, if 73 is still output replace TPS |
| Code 73 | No Throttle Position Sensor (TPS) change in “goose” test Must get at least 25% throttle rotation – TPS |
| Code 74 | Was brake depressed after engine ID was received ? |
| Code 74 | Brake On Off (BOO) signal open or short to ground – BOO |
| Code 75 | Brake On Off (BOO) signal shorted to power – BOO |
| Code 76 | Vane Air Flow (VAF) did not respond to “goose” test – VAF |
| Code 77 | System did not receive “goose” test – see TESTS |
| Code 78 | VPWR circuit to PCM was intermittent or the PCM is bad VPWR Diagnosis |
| Code 79 | A/C is on or pin 10 is shorted to power |
| Code 80 | Cylinder #8 failed cylinder balance test |
| Code 81 | Boost control solenoid – Solenoids |
| Code 81 | AIRD solenoid – Solenoids and Air Injection |
| Code 81 | 3 0L SHO – Inlet Air Solenoid – Solenoids |
| Code 82 | 2 3L TC – Fan Control wire shorted to ground – A/C and Fan Circuits |
| Code 82 | AIRB solenoid – Solenoids and Air Injection |
| Code 82 | 3 8L SC – Super Charger Bypass Solenoid – Solenoids |
| Code 83 | High Electro Drive Fan circuit fault – A/C and Fan Circuits |
| Code 83 | EGR Control solenoid – Solenoids |
| Code 83 | 3 0L SHO – Low Speed Fuel Pump Relay circuit – Power / Fuel Pump Circuits |
| Code 84 | EGR Vacuum Regulator – Solenoids |
| Code 84 | EGR cutoff solenoid – Solenoids |
| Code 84 | EGR Vent solenoid – Solenoids |
| Code 85 | 2 3L T/C Automatic – 3/4-4/3 Shift solenoid – Transmissions |
| Code 85 | CANP solenoid (ALL 1989) – Solenoids |
| Code 85 | 1 9L MFI – System has corrected rich condition – Fuel control |
| Code 86 | 2 3L or 2 9L Truck – A4LD 3/4 shift solenoid – Transmissions |
| Code 86 | (M) 1 9L MFI – System has corrected lean condition – Fuel control |
| Code 87 | Fuel pump circuit fault (check inertia switch) – Power / Fuel Pump Circuits |
| Code 87 | Vehicles with 2BBL carb – Temperature Compensated Accelerator Pump Solenoid – Solenoids (M) intermittent in fuel pump primary circuit – Power / Fuel Pump Circuits NOTE: On some Escorts with automatic seat belts this code is normal IN MEMORY due to the wiring |
| Code 88 | Throttle Kicker Solenoid – Solenoids |
| Code 88 | Variable Voltage Choke relay circuit fault – VVC |
| Code 88 | Fan Control circuit fault – A/C and Fan Circuits |
| Code 88 | A4LD – Converter Clutch Override solenoid – Transmissions |
| Code 88 | Electronic Ignition – IDM, DPI or spout circuit fault – Ignition Systems |
| Code 89 | A4LD – Converter Clutch Override solenoid – Transmissions |
| Code 89 | AXOD Torque Converter Control solenoid circuit – Transmissions |
| Code 89 | Exhaust Heat Control (heat riser) solenoid circuit – Solenoids |
| Code 90 | All cylinders passed cylinder balance test |
| Code 91 | System running lean – Fuel control |
| Code 91 | Transmission SS 1 circuit/solenoid problem – Transmissions |
| Code 92 | System running rich – Fuel control |
| Code 92 | Transmission SS 2 circuit/solenoid problem – Transmissions |
| Code 93 | Throttle linkage binding or bad ISC motor ISC HO2S not reading Fuel control |
| Code 93 | Transmission TCC circuit/solenoid problem – Transmissions |
| Code 94 | AIR system inoperative – Air Injection |
| Code 94 | Transmission TCC circuit/solenoid problem – Transmissions |
| Code 95 | Fuel pump: open, bad ground or always on – Power / Fuel Pump Circuits |
| Code 95 | AIR not Diverting (AIRD) – Air Injection |
| Code 95 | Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal) – Power / Fuel Pump Circuits |
| Code 96 | Fuel pump monitor circuit shows no power – Power / Fuel Pump Circuits |
| Code 96 | AIR Bypass (AIRB) not working – Air Injection |
| Code 96 | (Service 87 code first if present) Fuel pump relay or battery power feed was open – Power / Fuel Pump Circuits |
| Code 97 | E4OD OD cancel light circuit failure – Transmissions |
| Code 98 | Did not pass KOEO yet (Get 11 in KOEO first) |
| Code 98 | Transmission EPC circuit/solenoid failure – Transmissions |
| Code 99 | ISC needs to learn (Let idle for 2 minutes, Erase memory and retest) |
| Code 99 | Transmission EPC circuit/solenoid failure – Transmissions |
3-Digit Ford OBD1 Codes
| Code | Definition |
|---|---|
| 3 Digit | |
| Code 111 | System checks OK |
| Code 112 | Intake Air Temperature (IAT) sensor is/was low or grounded – IAT |
| Code 113 | IAT sensor is/was high or open – IAT |
| Code 114 | IAT sensor out of range – IAT |
| Code 116 | Engine Coolant (ECT) sensor out of range – ECT |
| Code 117 | ECT sensor is/was low or grounded – ECT |
| Code 118 | ECT sensor is/was high or open – ECT |
| Code 121 | Throttle Position (TP) sensor out of range – TPS |
| Code 122 | TP low (possibly grounded or open circuit) – TPS |
| Code 123 | TP is/was high or short to power – TPS |
| Code 124 | TP voltage was higher than expected – Fuel control |
| Code 125 | TP voltage was lower than expected – Fuel control |
| Code 126 | MAP or BARO sensor out of range – “>MAP |
| Code 128 | MAP vacuum has not been changing – check vacuum lines – “>MAP |
| Code 129 | No MAP or Mass Air Flow sensor change during “goose” test – MAP MAF |
| Code 136 | Oxygen sensor not switching/system lean Left or Front HO2S – Fuel control |
| Code 137 | Oxygen sensor not switching/system rich Left or Front HO2S – Fuel control |
| Code 138 | Fault in Cold Start Injector circuit – Fuel control |
| Code 139 | Oxygen sensor not switching Left or Front HO2S – Fuel control |
| Code 141 | O2 sensor circuit indicates system lean (both sides) |
| Code 144 | Oxygen sensor not switching Single, Right or Rear HO2S – Fuel control |
| Code 157 | Mass Air Flow signal is/was low or grounded – MAF |
| Code 158 | MAF sensor is/was high or short to power – MAF |
| Code 159 | MAF sensor is/was out of range – MAF |
| Code 167 | No Throttle Position sensor change in “goose” test (must get at least 25% rotation) – TPS |
| Code 171 | Oxygen sensor not switching – system was at adaptive limits – Single, Right or Rear HO2S – Fuel control |
| Code 172 | Oxygen sensor not switching – system is or was lean – Single, Right or Rear HO2S – Fuel control |
| Code 173 | Oxygen sensor not switching – system is or was rich – Single, Right or Rear HO2S – Fuel control |
| Code 174 | Oxygen sensor was slow in switching Single, Right or Rear HO2S – Fuel control |
| Code 175 | Oxygen sensor not switching – system was at adaptive limits – Left or Front HO2S – Fuel control |
| Code 176 | Oxygen sensor not switching – system is or was lean Left or Front HO2S – Fuel control |
| Code 177 | Oxygen sensor not switching – system was rich Left or Front HO2S – Fuel control |
| Code 178 | Oxygen sensor was slow in switching Left or Front HO2S – Fuel control |
| Code 179 | Fuel system was rich at part throttle Single, Right or Rear HO2S – Fuel control |
| Code 181 | Fuel system was lean at part throttle Single, Right or Rear HO2S – Fuel control |
| Code 182 | Fuel system was rich at idle Single, Right or Rear HO2S – Fuel control |
| Code 183 | Fuel system was lean at idle Single, Right or Rear HO2S – Fuel control |
| Code 184 | Mass Air (MAF) output higher than expected – Fuel control |
| Code 185 | Mass Air (MAF) output lower than expected – Fuel control |
| Code 186 | Injector pulse width longer than expected or Mass Air Flow (MAF) lower than expected – Fuel control |
| Code 187 | Injector pulse width shorter than expected or Mass Air Flow (MAF) higher than expected – Fuel control |
| Code 188 | Fuel system was rich at part throttle – Left or Front HO2S – Fuel control |
| Code 189 | Fuel system was lean at part throttle – Left or Front HO2S – Fuel control |
| Code 191 | Fuel system was rich at idle – Left or Front HO2S – Fuel control |
| Code 192 | Fuel system was lean at idle – Left or Front HO2S – Fuel control |
| Code 193 | Failure in Flexible Fuel (FF) sensor circuit – Fuel control |
| Code 194 | Perform cylinder balance test to check for inoperative injectors |
| Code 195 | Perform cylinder balance test to check for inoperative injectors |
| Code 211 | Ignition PIP signal was erratic or missing – Ignition Systems |
| Code 212 | Ignition TACH signal was erratic (module/wiring) or SPOUT circuit fault – Ignition Systems |
| Code 213 | Ignition SPOUT or SAW circuit open or shorted – Ignition Systems |
| Code 214 | Error in Cylinder ID (CID) circuit or signal – Ignition Systems |
| Code 215 | Primary circuit failure – ignition coil 1 – Ignition Systems |
| Code 216 | Primary circuit failure – ignition coil 2 – Ignition Systems |
| Code 217 | Primary circuit failure – ignition coil 3 – Ignition Systems |
| Code 218 | IDM signal open or high or left coil pack failure – Ignition Systems |
| Code 219 | SPOUT circuit failure, timing defaulted to 10 degrees – follow code 213 diagnosis |
| Code 222 | IDM open or high or right coil pack failure – Ignition Systems |
| Code 223 | Dual Plug (DPI), SPOUT or IDM circuit fault – Ignition Systems |
| Code 224 | Failure in ignition coil primary circuit – Ignition Systems |
| Code 225 | Knock sensor not tested (ignore if not pinging) – KS |
| Code 226 | Ignition Diagnostic Monitor (IDM) signal fault – Ignition Systems |
| Code 232 | EI primary coil circuit failure – Ignition Systems |
| Code 238 | EI primary circuit failure – ignition coil 4 – Ignition Systems |
| Code 244 | Camshaft position (CMP) sensor failure |
| Code 311 | AIR system not working – Single, Right or Rear HO2S – Air Injection |
| Code 312 | AIR not diverting – Air Injection |
| Code 313 | AIR not bypassing – Air Injection |
| Code 314 | AIR inoperative, Left or Front HO2S – Air Injection |
| Code 326 | Pressure Feedback EGR shows low pressure EGR not seating or not seating intermittantly – PFE |
| Code 327 | EGR feedback signal is/was low – EVR or PFE |
| Code 328 | EGR Valve Position (EVP) is/was low – EVR |
| Code 332 | EGR did not open/respond during test or if memory code, did not open intermittantly – EVR or PFE |
| Code 334 | EVP sensor is/was high – EVR |
| Code 335 | EGR feedback signal is/was out of range – EVR or PFE |
| Code 336 | PFE sensor signal is/was was high – “>PFE |
| Code 337 | EGR feedback signal is/was was high – EVR |
| Code 338 | Cooling system did not heat up (check cooling system / thermostat operation) |
| Code 339 | Cooling system overheated (check cooling system / thermostat operation) |
| Code 341 | Octane jumper installed (information only code to notify you if it is installed) |
| Code 411 | Idle speed system not controlling idle properly (generally idle too high) – ISC |
| Code 412 | Idle speed system not controlling idle properly (generally idle too low) – ISC |
| Code 452 | Vehicle Speed Sensor (VSS) problem |
| Code 461 | Engine over speed was detected |
| Code 511 | No power to PCM pin 1 or bad PCM (processor) |
| Code 512 | Memory power (PCM pin 1) was interrupted – Was battery disconnected ? |
| Code 513 | Replace processor (PCM) (internal failure) |
| Code 519 | PSP switch/circuit open – PSP h Pedal Position (CPP) circuit fault – PNP |
| Code 521 | Power steering pressure switch did not change state during KOER test |
| Code 522 | Vehicle not in PARK or NEUTRAL during KOEO |
| Code 524 | When the PCM commanded the fuel pump on, voltage was not detected on FPM |
| Code 525 | Vehicle in gear or A/C on during Self-Test |
| Code 526 | Neutral pressure switch closed or A/C on |
| Code 527 | Neutral drive switch open or A/C on |
| Code 528 | System shows voltage at pin 10 (is A/C on ?) or pin 30 (PNP, CPP switch) – PNP |
| Code 529 | Data Communications Link to processor failure Service any EEC codes, erase memory and retest If code is still present refer to instrument cluster diagnosis manual |
| Code 532 | Data communications link or electronic instrument cluster circuit failure |
| Code 533 | Data Communications Link to instrument cluster failure – see 529 |
| Code 536 | Brake On Off open or shorted to ground – BOO |
| Code 538 | System did not receive “goose” test – TESTS |
| Code 539 | System shows voltage at PCM pin 10 Is A/C on ? |
| Code 542 | Fuel pump open, bad ground or always on – – Power / Fuel Pump Circuits |
| Code 543 | Fuel pump monitor circuit shows no power – Power / Fuel Pump Circuits |
| Code 543 | (Service 556 code first if present) Fuel pump relay or battery power feed was open – Power / Fuel Pump Circuits |
| Code 551 | Problem in Intake Manifold Runner Control (IMRC) solenoid/circuit – Solenoids |
| Code 552 | AIRB solenoid/circuit failure – Solenoids |
| Code 553 | AIRD solenoid/circuit failure – Solenoids |
| Code 554 | Fuel Press Regulator Control solenoid/circuit fault – Power / Fuel Pump Circuits |
| Code 556 | Fuel pump relay primary circuit fault – Power / Fuel Pump Circuits |
| Code 557 | Low speed pump relay primary circuit fault – Power / Fuel Pump Circuits |
| Code 558 | EGR vacuum regulator solenoid/circuit failure – EVR or PFE or Solenoids |
| Code 559 | A/C relay primary circuit fault – A/C and Fan Circuits |
| Code 563 | High Fan Control (HFC) circuit failure – A/C and Fan Circuits |
| Code 564 | Fan Control (FC) circuit failure – A/C and Fan Circuits |
| Code 565 | Canister Purge 1 solenoid/circuit failure – Solenoids |
| Code 566 | Transmission 3/4 shift solenoid/circuit – Transmissions |
| Code 569 | Canister Purge 2 solenoid/circuit failure – Solenoids |
| Code 571 | Egr atmospheric regulator circuit failure |
| Code 572 | Egr vacuum regulator circuit failure |
| Code 578 | A/C pressure sensor VREF short to ground – A/C and Fan Circuits |
| Code 579 | ACP sensor did not change with A/C on – A/C and Fan Circuits |
| Code 581 | Cooling fan current was excessive – A/C and Fan Circuits |
| Code 582 | Open cooling fan circuit – A/C and Fan Circuits |
| Code 583 | Fuel pump current was excessive – Power / Fuel Pump Circuits |
| Code 584 | Open power ground circuit – Power / Fuel Pump Circuits |
| Code 585 | A/C clutch current was excessive – A/C and Fan Circuits |
| Code 586 | Open circuit in A/C clutch – A/C and Fan Circuits |
| Code 587 | Communication problem between PCM and Variable Control Relay Module (VCRM) – Power / Fuel Pump Circuits |
| Code 593 | Oxygen sensor heater circuit failure |
| Code 617 | Transmission shift failure (1/2 shift) – Transmissions |
| Code 618 | Transmission shift failure (2/3 shift) – Transmissions |
| Code 619 | Transmission shift failure (3/4 shift) – Transmissions |
| Code 621 | Solenoid/circuit failure – shift solenoid 1 – Transmissions |
| Code 622 | Solenoid/circuit failure – shift solenoid 2 – Transmissions |
| Code 623 | Overdrive light circuit failure |
| Code 624 | Solenoid/circuit failure -Electronic Pressure Control (EPC) current is high – Transmissions |
| Code 625 | Solenoid/circuit failure – Electronic Pressure Control (EPC) current is low – Transmissions |
| Code 626 | Transmission Coast Clutch (CCS) Solenoid/circuit fault – Transmissions |
| Code 627 | Torque Converter Clutch circuit fault – Transmissions |
| Code 628 | Excessive converter clutch slippage – Transmissions |
| Code 629 | Torque Converter Clutch circuit fault – Transmissions |
| Code 631 | Overdrive Cancel Light circuit problem – Transmissions |
| Code 632 | E4OD – Transmission Control Switch (TCS) should be cycled once between engine ID and Goose test |
| Code 633 | 4x4L switch should be in 4×2 or 4×4 high for the test |
| Code 634 | Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault Electronic shift transmission – Manual Lever Position (MLP) sensor out of range in Park-Transmissions |
| Code 636 | Transmission Oil Temperature (TOT) sensor out of range – Transmissions |
| Code 637 | TOT sensor is/was high or open – Transmissions |
| Code 638 | TOT sensor is/was low or grounded – Transmissions |
| Code 639 | Transmission Speed sensor (TSS) circuit fault – Transmissions |
| Code 641 | Transmission solenoid/circuit failure Shift Solenoid 3 – Transmissions |
| Code 643 | Torque Converter Clutch (TCC) circuit – Transmissions |
| Code 645 | Transmission 1st gear failure – Transmissions |
| Code 646 | Transmission 2nd gear failure – Transmissions |
| Code 647 | Transmission 3rd gear failure – Transmissions |
| Code 648 | Transmission 4th gear failure – Transmissions |
| Code 649 | Transmission EPC system failure – Transmissions |
| Code 651 | Transmission EPC solenoid/circuit fault – Transmissions |
| Code 652 | Torque Converter Clutch (TCC) circuit fault – Transmissions |
| Code 653 | Transmission control switch was not cycled during koer self-test |
| Code 654 | Transmission selector not in PARK – Transmissions |
| Code 656 | Torque Converter Clutch (TCC) slip – Transmissions |
| Code 657 | Transmission temperature was excessive – Transmissions |
| Code 659 | High vehicle speed detected while the vehicle was in PARK |
| Code 667 | Transmission manual lever position sensor circuit shorted |
| Code 668 | Transmission manual lever position sensor circuit open |
| Code 675 | MLP circuit voltage was out of the expected range |
| Code 691 | 4WD switch circuit failure |
| Code 998 | Did not pass Key On Engine Off test yet (Get 111 in KOEO first) |
| Code 998 | Transmission Electronic Pressure Control (EPC) solenoid/circuit fault – Transmissions |
Final Thoughts
Don’t let confusing OBD1 codes leave you stranded on the side of the road. With our comprehensive Ford OBD1 codes list, you can demystify your vehicle’s check engine light and keep it running smoothly for years to come.
Have you had success troubleshooting your Ford with our OBD1 codes list? Share your experiences in the comments below, and let’s help fellow Ford owners troubleshoot with confidence.
And if you’re having trouble decoding Ford OBD2 codes, our comprehensive Ford OBD2 codes list is here to help. Check it out!
Tools Recommendation
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References Sources
We take accuracy seriously at OBDCodex, which is why we rely on trusted reference sources for all of our OBD1 code lists. This is the source we consulted to compile our comprehensive Ford OBD1 codes list:
Ford OBD1 Codes and Procedure – fordfuelinjection.com
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