Q: Reduced engine power 2004 Grand Prix

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My car keeps going into reduced power engine mode,I have replaced the accelerator pedal,throttle body,and maf sensor,the only code is showing is the oxygen sensor,but I don't think it's that,please help

My car has 180000 miles.
My car has an automatic transmission.

Hello - you don’t specific what code is causing the Check Engine light to illuminate (oxygen sensor problem), but a failure of the pre-catalytic converter O2 sensor could cause a Reduced Power experience. Failure of the O2 sensor can cause the engine to run too rich, passing unburned gas fumes to the catalytic converter, a real overheat/fire damage possibility. I recommend a Reduced Power inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

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