2002 Buick Lesabre. I get P0131, P0171, and P1133 code which will reset but come back on soon. Have checked some of the related sensors and supply voltages with no apparent problem. Are there common problems associated with this model/year car?
Sounds like you just need to replace the one or two 02 sensors on bank 1.If you have over 100,000 miles the 02 sensos are realy to be replaced just as spark plugs and air filteres. If you wait to long to replace them you take a chance of them not comming out and then when they do go bad you will need to replace the exhaust as well.Hope this helps and good luck.
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