Since i put in the Pacesetters.....im getting a P1133 (HO2S Insufficient Switching) on the upper O2 sensor. My buddy had it hooked up to his powertuner, and driving around the O2 sensor seemed to be operating normally. He delieted the code for now, so i dont have to look at the SES light. What would this code meen if the sensor is still working??

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-2000 Grand Prix GTP 13.341 @ 102.62
-2003 Grand Prix GT (daily driver)
1991 Grand Prix GTP Getrag 284 5 speed 1 of 787 5 speeds in 91. 15.221 @ 92.46

replace it to be safe

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http://myspace.com/jon72181

http://www.gearchatter.com/viewpost12593.php might help

thats the techline data so i am not needed here

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Is there an exhaust leak? Did you maybe fray a cable or something? If not, replace the sensor

I just had this problem for about 2yrs replaced o2 after o2 some years have a test mode if it see the fuel trims out it dumps extra fuel it thinks the car is lean also my car would surge at idle on some WOT runs I would get KR and other times none it was hit and miss PRJ Performance figured out the problem and flashed my 2001 PCM as a 1998 PCM since he has done that no more light no more surging car is running great A/F is 11.9- 12.1 at WOT

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The Y is leaking....that probably has something to do w/ it.

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-2000 Grand Prix GTP 13.341 @ 102.62
-2003 Grand Prix GT (daily driver)
1991 Grand Prix GTP Getrag 284 5 speed 1 of 787 5 speeds in 91. 15.221 @ 92.46

Pacesetters are known to leak..........That's your problem

Yeah...thanks....kinda realized that.

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-2000 Grand Prix GTP 13.341 @ 102.62
-2003 Grand Prix GT (daily driver)
1991 Grand Prix GTP Getrag 284 5 speed 1 of 787 5 speeds in 91. 15.221 @ 92.46

My exhaust was and still leaking and the PCM flash fixed it

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Yeah....im in the process of taking the Y back off and cleaning all the RTV out of it and putting the RTV on the outside of the Crossover and back header to put it back on and then tighten the clamps down....then put a new AC Delco O2 sensor in there and have my buddy turn off the code in a few days to see if it still comes up. (the sensor in there now has just a hare over 100K on it, so its time for it to be replaced anyways)

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-2000 Grand Prix GTP 13.341 @ 102.62
-2003 Grand Prix GT (daily driver)
1991 Grand Prix GTP Getrag 284 5 speed 1 of 787 5 speeds in 91. 15.221 @ 92.46

get a denso O2 they are better and u can run leaded fuel with them just not all the time

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Yeah...ive heard good things about Denso. Where can you get them? Does Advanced, or Auto Zone carry Denso?

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-2000 Grand Prix GTP 13.341 @ 102.62
-2003 Grand Prix GT (daily driver)
1991 Grand Prix GTP Getrag 284 5 speed 1 of 787 5 speeds in 91. 15.221 @ 92.46

I was getting mine at Auto Zone they will have to order it I replaced 3 under their warranty cause of the 1133 code lol

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I think i may have found the problem why i set that 1133.......i took off the DP. and looked up into the Y...and i saw a trail of melted Copper RTV i used leading down to the O2 sensor.....i pulled the O2 out a few days ago and looked at it and it looked fine....but after taking the DP out tonite i looked in there and saw that....so im pretty sure i'll be fine once i put the new sensor in there, cause all the RTV has been burned off.

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-2000 Grand Prix GTP 13.341 @ 102.62
-2003 Grand Prix GT (daily driver)
1991 Grand Prix GTP Getrag 284 5 speed 1 of 787 5 speeds in 91. 15.221 @ 92.46