1998 GMC Yukon oil in antifreeze

1998 GMC YUKON
112,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
HD1998
  • MEMBER
  • 1 POST
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
Advertisement
Avatar
BLUELIGHTNIN6
  • CERTIFIED EXPERT
  • 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.




Thanks for using 2CarPros.com!
Jan 24, 2009 at 8:54 PM