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What does the codes p0121 and p0420 normally indicate for a 2007 Pontiac G6 4 cylinder ?


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DTC P0121: Throttle Position (TP) Sensor 1 Performance

DTC P0420: Catalyst System Low Efficiency

The first code usually means you need to replace the throttle body assembly. The throttle body position sensor is an integral part of the throttle body and cannot be changed separately.

The second code means you have a catalytic converter that is not performing as it should and requires replacement. This can be caused from the car running poorly, lack of maintenance, or other engine issues that need addressed.
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GM Dealer Technician For 18+ Years
In the automotive industry for 20+


   
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PLEASE HELP MY ABS LIGHT PLUS LOW FUEL LIGHT PLUS SECURITY LIGHT PLUS CHECK ENGINE LIGHT ALL COME ON AND MY DEALER CAN'T FIND THE PROBLEM HELP ED

DTC P0420: Catalyst System Low Efficiency

The first code usually means you need to replace the throttle body assembly. The throttle body position sensor is an integral part of the throttle body and cannot be changed separately.

The second code means you have a catalytic converter that is not performing as it should and requires replacement. This can be caused from the car running poorly, lack of maintenance, or other engine issues that need addressed.[/quote]


   
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