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1999 GMC Sonoma Question: OBD 2 keeps marking the same code P0135

 

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cervantes, Chino, CA, September 25, 2011, 11:45
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Code P0135 bank one sensor one. I changed the sensor on the driverside exaust and the same code keeps coming up. Do you think the sec air system is causing this problem because the only thing that stays incomplete when the code pops up.

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