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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1133: O2S Circuit - Insufficient Switching - Sensor 1 >> Diagnostic Aids

Diagnostic Aids

O2S wiring and connections should be checked if any this DTC is set. Contamination is the most likely cause for this DTC to set. Contamination could be caused by fuel, improper use of RTV sealant, engine oil or coolant contamination. Correct source of contamination before replacing sensor.

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