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P0121 Engine Trouble Code

P0121 Engine

When you check engine light came on code P0121 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 P0121 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on our car models.

P0121 if your catalytic convertor fails completely, you eventually won't be able to keep the car running. Your gas mileage will also be terrible, so you should try and fix it as soon as you can. Unfortunately, the average replacement cost is around $2,000 and you can't do it yourself unless you're an experienced mechanic.

P0121 Code Meaning :

P 0 1 2 1
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine Intake Valve Control Solenoid Circuit Low Engine Oil Temperature Sensor Malfunction Crankshaft Position Sensor A Circuit Malfunction Glow Plug/Heater Circuit 'A' Malfunction

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.

P0121 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P0121 OBD-II Trouble Code The throttle position sensor ( P0121 code.

Reason For P0121 Code

The reason of P0121 OBD-II Engine Trouble Code is Engine Oil Temperature Sensor Malfunction.

P0121 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.