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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-26-2009, 12:41 PM   #1
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Default P1133



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.

You likely won't notice any drivability problems.


  • Engine operating in closed loop mode.
  • Check exhaust system for leaks. Repair as necessary.
  • Visually inspect HO2S 1 for secure installation or
    corrosion on terminals.
  • Replace HO2S
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