cAR CAME IN RUNNING ROUGH WITH CHECK ENGINE LIGHT ON. HAD FRONT O2 SENSOR CODE I FORGET WHICH ONE AND PO420. I FOUND WRONG SENSOR IN FRONT OF CAT. HAD AN O2 SENSOR RATHER THAN A A/F SENSOR. REPLACED WITH A/F SENSOR AND REPLACED PLUGS AND WIRES. RESET COMPUTER....

FIX posted 1/5/2006

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