2001 Chevy Blazer 02 SENSOR

Tiny
JSNAP001
  • MEMBER
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
I brought my car in for a prewinter antifreeze flush/fill. Several days later the engine began to run irregullarly and the check engine light began flashing. I put the code reader on the car and it showed the following: P0306 - Cylinder 6 Misfire Detected, P0155 - O2 Sensor Heater Malfunction (Bank 2 Sensor 1). Could the problems be caused by something they did during the flush/fill or is it just coincidence? I'm assuming that the cylinder misfire is simply a result of the O2 sensor problems, am I correct in looking to replace them?
Saturday, November 29th, 2008 AT 11:35 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,573 POSTS
Hi:
I doubt the miss is from the prior service unless the did something purposely. As far as the random missfire, the O2 sensor may cause the problem. I would start there first to see if the problem is resolved. However, there may be other problems such as a bad spark plug which is causing the O2 sensor to react to unburned fuel. Or it could be a different ignition problem. Try the O2 sensor and see if it helps. Let me know how it goes.

Joe
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Saturday, November 29th, 2008 AT 5:05 PM

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