Question about 2003 GMC Yukon XL
Check engine light comes on vehicle idles rough.Code reader says po131,po300,po1133. I changed the oxygen sensor on the passenger side no difference thought maybe bad gas. I bought a fuel filter and some spark plugs. When I changed the plugs the driver side plugs were black and the passenger side were white. Could this be the pressure regulator or am I looking in the wrong place? Could this be a vacuum line?
P0131 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage
P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
Bank 1 Sensor 1
P0300 - Engine Misfire Detected
I would check for vacuum leaks, maybe intake or brake booster
Posted on Dec 17, 2008
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Posted on Jan 02, 2017
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