P1134 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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, 02:35 PM   #1
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Default P1134



PCM reads Heated Oxygen Sensor (HO2S) activity for 100
seconds. During this period, PCM counts the number of Lean/Rich (L/R)
and Rich/Lean (R/L) switches.
With this information, an average time for all transitions
can be determined. PCM then divides R/L average by L/R rich average to
obtain a ratio. If HO2S ratio is not within range, DTC P1134 will 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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