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P1291 Engine Trouble Code

P1291 Engine

When you check engine light came on code P1291 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However your vehicle's manufacturer may have a different definition for the P1291 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on our car models.

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 $200-$300 depending on the car, but that's usually the cost of parts because the labor is relatively simple.

P1291 Code Meaning :

P 1 2 9 1
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine Fuel And Air Metering Ambient Air Temperature Sensor Circuit Low Cylinder 4 Contribution/Balance Fault Glow Plug/Heater Circuit 'A' Malfunction

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate.

P1291 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P1291 OBD-II Trouble Code Injector High Side Short To GND Or VBATT Bank 1 is one of the definitions for the P1291; however your vehicles manufacturer may have a different definition for the P1291 code. Please check below for y P1291 code.

Reason For P1291 Code

The reason of P1291 OBD-II Engine Trouble Code is Ambient Air Temperature Sensor Circuit Low.

P1291 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.