Contour Enthusiasts Group Archives Forums General Troubleshooting Another Oxygen Sensor Concern

look like spark plugs in your exhaust pipe with a wire loom, 3 or 4 wires of different colors.

Had similar O2 probs. Had Cat's changed at 40k, due to disintegrating plates (anyone else?) Could be that the excess heat from cats damaged O2's, but after resetting CEL after a few weeks, has not come back on. The faults indicated lean mixture and cat efficency, which both point to O2's. Runs fine now, but am waiting...