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P2121 Engine Trouble Code

Meaning of P2121 engine trouble code is : When your car's 'P2121 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.

P2121 Possible Solution:

P2121 Engine

Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage.

P2121 Code Meaning :

P 2 1 2 1
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine Fuel And Air Metering (Injector Circuit Malfunctions Only) Fuel Rail/System Pressure - Too High Turbocharger Boost Sensor A 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.

P2121 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P2121 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.

Reason For P2121 Code

The reason of P2121 OBD-II Engine Trouble Code is Fuel Rail/System Pressure - Too High.

Parts or components should not be replaced with reference to only a P2121 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.