2000 Pontiac Firebird Q&A
2000 Pontiac Firebird Question: What would cause these codes to pop up all at once?
don't waste your money seek diag to get it right the first time. you may have a circuit issue - globalhelper
Other possibility is a fouled catalytic converter. This will back-up the exhaust flow, tripping o2 sensors. Need diagnostic on flow to determine issue. - csubak30