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1998 GMC Yukon oil in antifreeze

Tiny
HD1998
  • MEMBER
  • 1998 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 112,000 MILES
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
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Saturday, January 24th, 2009 AT 8:33 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
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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Saturday, January 24th, 2009 AT 8:54 PM

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