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Home >> Buick >> 2003 >> Century Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P1133: Ho2S 1 - Insufficient Switching >> Conditions For Setting DTC

Conditions For Setting DTC

The PCM detects that the HO2S 1 voltage switched from rich-to-lean fewer than 20 times within a 100 monitoring period or the PCM detects that the HO2S 1 voltage switched from lean-to-rich fewer than 20 times within a 100 monitoring period.

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