Question about 2005 Chevrolet TrailBlazer LS
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Posted on Jan 02, 2017
PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.
Posted on Jan 28, 2009
Sounds like your head gasket has a leak. I would also check your dip stick. If there is coolant mixed with the oil also. Then it is your head gasket.
Posted on Feb 03, 2009
The P0218 Code is primarily intended to indicate a faulty thermostat.
Have the thermostat replaced
Other possible causes that could trigger this code would be:
Low engine coolant level
faulty cooling fan
faulty coolant temperature sensor
faulty intake air temperature sensor
Posted on Sep 08, 2009
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