SES light code P0420
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SES light code P0420
Getting this code and book indicates it is the "catalytic converter system efficiency below threshold...left bank."
Before I take it in to get tested...what could this be and why?
Thanks for any replies
2002 Z28
K&N Filter
85mm MAF
Free Ram air cut out
Subframe connect
Strut Tower brace
SLP Loud Mouth exhaust
Before I take it in to get tested...what could this be and why?
Thanks for any replies
2002 Z28
K&N Filter
85mm MAF
Free Ram air cut out
Subframe connect
Strut Tower brace
SLP Loud Mouth exhaust
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