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Check P0121 Fault Code

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 Code Reason

Parts or components should not be replaced with reference to only a P0121 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.

P0121 Possible Fix :

There are a number of reasons which can cause a car engine not to start, the most common, of course, being a dead battery. Pay special attention to the noise it makes when you turn the key. Is the car completely silent? If so, there may be a problem with your battery terminal cable connections. Does your car crank over but not start? Then it may be your spark plugs or fuel supply to your engine. In any case, if you're out on the road, try jumpstarting your car then investigating the cause further when you're safely back at home.

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

P0121 OBD-II Trouble Code The throttle position sensor (

Reason For P0121 Code

The reason of P0121 OBD-II Fault Code Check is P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance.

P0121 Solution:

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.

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