Question about 2001 GMC Yukon Denali

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I recently replace all four O2 sensors after receiving "P0154" OBD codes. The vehicle has about 105k miles. The replacement O2 sensors were Bosh BS15733 (front) and BS13474 (rear). The vehicle barely ran after installing the new sensors - exhibiting obvious signs of a too-rich mixture. The check engine light was also flashing and the OBD codes were P0154 and P0137. After I reinstalled the old sensor on the right rear the car seemed to run normally so I concluded the new Bosch sensor was bad and ordered a replacement. After installing the replacement sensor (this time a BS13686 w/ factory connector) the car seemed to run normally but the check engine light came on again after a few days - this time with a P0137 code. I have reinstalled the old sensor and have not yet seen the results. It seems highly unlikely that I would receive two defective O2 sensors. I have check the plug connectors and wiring and did not find any obvious problem. I have not checked continuity back to the ECU as I do not have enough information (wiring diagram) to perform that test. Suggestions?

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  • shopper355 Jul 19, 2009

    Yes, I did disconnect the battery, but not for 20 minutes - probably only 5 minutes or so.

  • shopper355 Jul 19, 2009

    Yes, I did disconnect the battery, but not for 20 minutes - probably only 5 minutes. I again disconnected the battery after replacing the new right rear sensor with another new sensor.

  • shopper355 Jul 19, 2009

    Thanks for the detailed response. Re "I only use OEM replacement O2 sensors as I have run into this problem before with aftermarket sensors" do you have specific experience with defective Bosh sensors?

    Do you know if the Bosh sensors have an air reference hole or do they breathe through the wire harness?

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Did you disconnect the battery after installing the new O2 sensors. The reason I say this, is the ECU has "memorized" the old O2 sensor read outs and now has to readjust to the new sensors. I would try disconnecting the negative battery cable for 20 minutes and reconnecting, drive and see if it does not clear its self.
Let me know.
Regards,

Posted on Jul 19, 2009

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