P0133 - 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 09-24-2009, 12:50 PM   #1
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Default P0133



PCM provides about 0.45 volt reference to HO2S 1. HO2S 1
sensor signal voltage varies from about one volt when exhaust is rich
to about 0.1 volt when exhaust is lean. PCM counts number of times a
rich-to-lean and lean-to-rich response is indicated and adds amount of
time it takes to complete all transitions. PCM uses this information
to determine average time for each transition. If average response
time is slow, DTC P0133 will set.

You will likely not notice any drivability problems.

  • The oxygen sensor is faulty
  • The wiring to the sensor is damaged
  • Exhaust leak
Possible Solutions

The simplest thing to do is to reset the code and see if it comes back.
If the code comes back.
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