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P1133 code - Colorado Chevrolet Cars & Trucks

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  • tonyfp231 Aug 22, 2008

    Runs rough until engine warms up. code P1133

  • sully426 Apr 13, 2009

    i have a 2004 Chevy Trailblazer that is giving me the same code(P1133) and it runs very rough and sluggish and my OBD2 scanner says that its running too lean, yet i get black smoke out of the exhaust like it is running too rich, i have replaced the O2 sensor but it hasn't helped, what could be wrong?

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I have a 1998 Chevorlet Monte Carlo, and a I just got a p1133 code a week ago. I have my own diagnostics equipment, and the code is for "Oxygen sensor insufficient switching(upstream)"
I believe the codes are manufacturer specific so the code should be the same for all chevy's. The upstream oxygen sensor is located in the exhaust system before the catalyic converter. An ideal voltage for the sensor is .45v, but the sensor should switch between .1 and .9, when there is insufficient switching it causes the engine to run both too lean and too rich at times. Too lean could cause the engine to missfire and run rough. Hope this helps.

Posted on Aug 29, 2008

  • flyman128 Aug 29, 2008

    I forgot to mention that my solution was to replace the oxygen sensor. If you go to autozone they have the haynes manuals for specific cars that include all the trouble shooting codes and diagnostics info. This may be helpfull to you.

  • Jason Ghormley Sep 25, 2011

    so how do i fix that

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How do i fix a p01133 error code on my 96 beretta


DTC P1133 HO2S Insufficient Switching Sensor 1
What other codes , need to diagnose those codes before P1133 !
Important: If any DTCs are set (except P1133 or P1134), go to those DTCs before proceeding with this diagnostic table. If the vehicle is misfiring is there a DTC P0300 Engine Misfire Detected code ?

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I was getting a p0420 code on my 2001 alero and now when I reset the light I am getting a p1133 code. I did put gas treatment into the full tank of gas and then the p1133 code came on. any suggestion on...


You never replaced the exhaust converter,ruined by the
coolant--- PO420

The P1133 is probably an O2 Sensor also ruined
I would replace them all.

Who ever did the head gasket should have done
all that

Don't waste your money on anything that goes
into a fuel tank,not necessary,nor does it fix anything

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On your web browser search type in "diagnostic code p1133. You will find a site that relates to all the codes. P1133 is for a problem with the heated oxygen sensor.

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1 Answer

Code p1133


GM p1133 = Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
more than likely you have a bad oxygen sensor...the primary oxygen sensor in the exhaust BEFORE the catalytic converter.

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1 Answer

Code: P1133


P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor
You will need to check the output signal from this O2 sensor, if the voltage low (.10-.25 volts) try spraying propane into the air cleaner to see if the O2 volts go up, it should go to around .75 volts, if nothing happens then the O2 sensor is bad, bank #1 O2 is on the same side as #1 cylinder
PLEASE RATE THIS INFO.

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