Car runs rough P0420
Buick Regal 2013 Premium Turbo 124000 miles
My Car has an check engine light on and the code is P0420 and I've replaced the catalytic converter and oxygen sensors but my car still has the light on and runs really rough. Has anyone had and fixed this issue
I have the Premium Turbo version
I have the Premium Turbo version
6 reports
JO
Yeah, it's going to be your timing. You probably have a faulty, spark plug issue because timing is air fuel ratio. Spark ignites fuel, efficiently, through a high voltage process. Too much fuel is going to trigger a light. Too much oxygen is lean, VERY bad, vs You will melt metal with too much oxygen and heat. Sorry so late. 😎tunerGUY
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