1998 GMC Yukon oil in antifreeze

1998 GMC YUKON
112,000 MILES • V8 • 4WD • AUTOMATIC
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HD1998
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I have oil in the antifreeze (thick light brown liquid at the top of the radiator) and My check engine light is on giveing a p0161 - O2 Sesnsor Heater circuit (Bank 2 Sensor). I assume the sensor is being affected by the oil in the coolant.
looking for guidence
Jan 24, 2009 at 8:33 PM
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BLUELIGHTNIN6
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Normally this is caused by a blown intake or head gasket. Need to have engine checked at repair shop so they can perform pressure/dye tests to look for cracks.




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