Diagnostic Aids

If DTC P0134 is also set, diagnose DTC P0134 first, then retest system. Replace faulty or contaminated O2S.

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.