Question about Chevrolet Epica
EXHAUST RELATED ERROR CODES
There are 711 possible PO generic DTC error codes. Only 7 of the 711 codes are exhaust related.
PO401: Insufficient EGR Flow
PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected
PO410: Secondary Air Injection System Malfunction
PO420: Catalyst System Efficiency Below Threshold (Bank 1)
PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)
PO430: Catalyst System Efficiency Below Threshold (Bank 2)
PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)
THINGS TO ASK YOURSELF OR YOUR CUSTOMER
Have there been any driveability or performance issues with the vehicle, have there been any recent repairs or tune-up work performed, if so was the check engine light reset and were the codes recorded on previous repair orders.
Do not rely on scan tool data alone. In most applications, the customer will have the check engine light reset prior to repair. If the original cause of converter failure is intermittent, only the catalyst failure code may show up (masking the original reason for converter failure).
Posted on Nov 06, 2012
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