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DTC P1133 - HO2S INSUFFICIENT SWITCHING SENSOR 1 Oldsmobile Eighty-Eight X

Testing & Diagnostics

Note. For circuit reference, see DTC P0131 schematic.

Circuit Description

PCM monitors Heated Oxygen Sensor (HO2S) activity for 100 seconds. PCM determines if HO2S 1 is functioning properly by counting number of HO2S 1 Lean/Rich (L/R) and Rich/Lean (R/L) switches. If PCM determines that HO2S 1 did not switch enough times, DTC 1133 is set.