Honda P1128: Manifold Absolute Pressure (MAP) Sensor Signal Lower Than Expected
Is your scanner showing Honda P1128?
No worries. We'll show you what it means and how to deal with it.
Honda P1128: Manifold Absolute Pressure (MAP) Sensor Signal Lower Than Expected
OVERVIEWWhat Does The Honda P1128 Code Mean?
The MAP sensor output is 33 kPa (9.8 in. Hg, 249 mmHg) or less for at least 2 seconds when atmospheric pressure is 52 kPa (15.4 in. Hg, 392 mmHg). The execution time is once per driving cycle.
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot.
What Are The Potential Causes Of The Honda P1128 Code?
- Dirty air cleaner element
- Poor connections or loose terminals at the MAP sensor and the PCM
- Faulty MAP sensor
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
>>> CrocSee 250 Pieces - Car Fuses Assortment Kit
>>> APDTY Manifold Pressure Sensor
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
- Honda DTC Codes for P1128 – Page 1.
- Technical Service Bulletins 03-020 for P1128 – American Honda Motor Co., Inc.; pages 126-128.
