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Check P0420 Fault Code

When you check engine light came on code P0420 the reason should be Three way catalytic converter Bank 1 does not operate properly.. However your vehicle's manufacturer may have a different definition for the P0420 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on our car models.

P0420 Code Reason

P0420 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.

P0420 Possible Fix :

If the culprit is a poor fuel pressure regulator, then I suggest looking around for a replacement part and taking your car to your local mechanic for installation. If you're a skilled mechanic, then you should be able to install a new fuel pressure regulator easily. But if you're just starting out, it's always best to have the professionals take care of this job. Believe me, the fuel pressure regulator is not an easy part to install.

P0420 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P0420 OBD-II Trouble Code The Engine Control Module (

Reason For P0420 Code

The reason of P0420 OBD-II Fault Code Check is P0420 Catalyst System Efficiency Below Threshold Bank 1.

P0420 Solution:

Excessive air inflow can be caused by a vacuum leak, a dirty sensor or, an exhaust gas recirculation valve not closing properly. If the problem is not enough fuel, the culprit may be dirty injectors or fuel filters, a weak fuel pump or a leaky fuel pressure regulator. The lean fuel mix error may be accompanied by rough idling, engine misfires, hesitation during acceleration and overall poor engine performance.

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