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U1231 Engine Code Repair

Meaning of U1231 engine trouble code is a kind of network trouble code and theoretically you can drive for a few weeks or even months with a broken MAF sensor. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. At a shop, the replacement cost is between $240-$400 depending on the car, but that's usually the cost of parts because the labor is relatively simple.

U1231 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 U1231 code is occuring now you should check U1231 repair processes.
Now don't ask yourself; What should you do with U1231 code ?
The solution is here :

U1231 Possible Solution:

U1231 Engine

The firing order is an important part of the overall design of the engine and is determined during the design of the engine to eliminate as much engine vibration as possible. If the firing order is changed or adjusted, the ignition from the spark plug is delivered at the wrong time and the engine functions poorly or does not run. The firing order for a particular engine is typically found in the repair manual specific to that model.

U1231 Code Meaning :

U
OBD-II Diagnostic Network (U) Trouble Code For Engine

1
Fuel And Air Metering

2
Fuel Rail/System Pressure - Too High

3
Turbocharger Boost Sensor A Circuit Low

1
Shift Solenoid E Performance or Stuck Off

Regarding the U1231 code, it would probably be worthwhile to carefully inspect the wire harness near the intake manifold bracket. This is done most easily from below the car in the area near the oil filter.

U1231 OBD-II Diagnostic Network (U) Trouble Code Description

U1231 engine trouble code is about Shift Solenoid E Performance or Stuck Off.

Main reason For U1231 Code

The reason of U1231 OBD-II Engine Trouble Code is Fuel Rail/System Pressure - Too High.

U1231 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.