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P1390 Engine Trouble Code

P1390 Engine

When you check engine light came on code P1390 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 P1390 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.

P1390 Code Meaning :

P 1 3 9 0
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine Fuel And Air Metering Fuel Rail Pressure Sensor Circuit Malfunction Cylinder 4 Contribution/Balance Fault Exhaust Gas Recirculation Sensor B Circuit High

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.

P1390 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P1390 OBD-II Trouble Code Octane Adjust Pin Out Of Self Test Range is one of the definitions for the P1390; however your vehicles manufacturer may have a different definition for the P1390 code. Please check below for your spe P1390 code.

Reason For P1390 Code

The reason of P1390 OBD-II Engine Trouble Code is Fuel Rail Pressure Sensor Circuit Malfunction.

P1390 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.