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C1891 Engine Code Repair

Meaning of C1891 engine trouble code is a kind of chassis trouble code and when your car's 'C1891 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. But in many cases, it means at minimum that you'll be visiting the car dealer to locate the malfunction and get the light turned off.

C1891 Fault Symptoms :

  1. Check engine light comes on
  2. Engine stalling or misfiring
  3. Engine performance issues
  4. Car not starting

If one of these reasons for C1891 code is occuring now you should check C1891 repair processes.
Now don't ask yourself; What should you do with C1891 code ?
The solution is here :

C1891 Possible Solution:

C1891 Engine

Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.

C1891 Code Meaning :

C
OBD-II Diagnostic Chassis (C) Trouble Code For Engine

1
Fuel And Air Metering

8
Fuel Rail Pressure Sensor Circuit Malfunction

9
Ignition/Distributor Engine Speed Input Circuit Malfunction

1
Shift Solenoid E Performance or Stuck Off

The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions.

C1891 OBD-II Diagnostic Chassis (C) Trouble Code Description

C1891 engine trouble code is about Shift Solenoid E Performance or Stuck Off.

Main reason For C1891 Code

The reason of C1891 OBD-II Engine Trouble Code is Fuel Rail Pressure Sensor Circuit Malfunction.

C1891 DTC reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.