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Ask Dave Nova Your Own Question
Dave Nova
Dave Nova, GMC Technician
Category: GM
Satisfied Customers: 19452
Experience:  ASE Master Certification. GM World Class Certification
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2004 gmc yukon 5.

Customer Question

2004 gmc yukon 5.3L rough idle with b1, 02 2, p0300 code
Submitted: 7 years ago.
Category: GM
Expert:  Dave Nova replied 7 years ago.
The most likely problem is a bad primary O2 sensor on the drivers side. Bank 1, Sensor 1 If the sensor reads lean, the computer will push too much fuel and cause the problem you are experiencing. Try unplugging this sensor and running the engine. This will set an additional code, but try it and see if the engine smooths out. Disconnect the battery for about 30 seconds before running the engine to reset fuel trim values.
Customer: replied 7 years ago.
I already took care of the problem last night. Thanks anyway.
Expert:  Dave Nova replied 7 years ago.
Thanks for using Just Answer.
Customer: replied 7 years ago.
I don't plan on accepting the answer only because I found the answer to the problem in my vehicle before you sent me a response. I appreciate you answering back though and will use this service again in the future when necessary. Thanks anyway.
Expert:  Dave Nova replied 7 years ago.
I understand. Thanks again.