Diagnostic Aids

Check for O2S contamination due to fuel, improper use of RTV sealant, engine oil or coolant. Repair source of contamination before replace sensor.

An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement.