P1251 Engine Trouble Code

Meaning of P1251 engine trouble code is a kind of powertrain trouble code and when your car's 'P1251 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.

P1251 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 P1251 code is occuring now you should check P1251 repair processes.
Now don't ask yourself; What should you do with P1251 code ?
The solution is here :

P1251 Possible Solution:

P1251 Engine

The crankshaft sensor signals the fuel injection computer or the ignition control when the cylinders are firing. This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time.If either sensor isn't working correctly, the car will run rough and the engine will be less efficient. In later car models, the car's computer can usually keep the vehicle running, but the engine warning light on the dashboard goes on to warn the driver.

P1251 Code Meaning :

P 1 2 5 1
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine Fuel And Air Metering Manifold Absolute Pressure/Barometric Pressure Circuit High Input Cylinder 1 Injector Circuit Low Crankshaft Position Sensor A Circuit Low Input

Is the fuel pump sometimes not priming when you turn the key to ON(II)? Start by measuring the fuel pressure and checking whether you have bright white-bluish spark at all four plugs. The mechanical timing is also something that you should check, as we mentioned above.

P1251 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P1251 OBD-II Trouble Code Air Mixture Solenoid Circuit Malfunction is one of the definitions for the P1251; however your vehicles manufacturer may have a different definition for the P1251 code. Please check below for your spe P1251 code.

Main reason For P1251 Code

The reason of P1251 OBD-II Engine Trouble Code is Manifold Absolute Pressure/Barometric Pressure Circuit High Input.

Parts or components should not be replaced with reference to only a P1251 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.