FIAT P1128: Closed Loop Fueling Not Achieved - Bank 1 Upstream
Is your scanner showing FIAT P1128?
No worries. We'll show you what it means and how to deal with it.
FIAT P1128: Closed Loop Fueling Not Achieved - Bank 1 Upstream
OVERVIEWWhat Does The FIAT P1128 Code Mean?
This continuous diagnostic is used to detect when fuel control has not changed from open loop to closed loop control. A count down timer is initiated at engine start. The length of the timer is based on the starting engine coolant temperature. The timer will decrement as long as the enable conditions are met. Once the timer has expired, the fuel control system is expected to be in closed loop operation. If the fuel control system does not go closed loop within the calibrated time, the diagnostic will fail.
What Are The Potential Causes Of The FIAT P1128 Code?
- O2 sensor 1/1 wiring open or shorted
- Restricted fuel supply line
- Fuel pump inlet strainer plugged
- Fuel filter/pressure regulator
- Fuel pump module
- MAP sensor operation
- ECT sensor operation
- O2 sensor
- Fuel filter/pressure regulator
- Powertrain control module (PCM)
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Fiat Engine Control Module
>>> Denso 234-4483 Oxygen Sensor
>>> Fuel Supply Hose - Mopar (68333346AA)
>>> BOSCH Fuel Filter Fits FIAT LANCIA PEUGEOT SEAT VW 0.9-4.2L 1971-2005 0450905002
>>> New Herko Fuel Pressure Regulator PR4082 For Jaguar And Fiat 1978-1983
>>> Fiat Fuel Pump Module
>>> Bosch 0281002996 Original Equipment Boost Pressure/Manifold Absolute Pressure (MAP) Sensor for Select Fiat
>>> MTE-THOMSON 4200 Engine Coolant Temperature Sensor ECT
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
FIAT P1128, DTCDECODE.
