check engine code....... - Maintenance and Repair Forum - j-body.org

check engine code....... - Maintenance and Repair Forum

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check engine code.......

Wednesday, November 07, 2007 9:20 PM

P0420..... catalytic converter efficency below threshold.... would that be my downstream o2 sensor going bad??

01' Z24 5 speed
422whp/400wtq
T4 Turbocharged
Built LD9
HP Tuners

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