Diagnostic Aids
Verify clean, tight connection on G106 (Brown wire). A lean air/fuel condition may be caused by contaminated fuel, low fuel pressure or vacuum and exhaust leaks. An intermittent condition may be caused by poor connection, rubbed-through insulation, or a broken wire inside insulation. Check ECM harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connections before component replacement.