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2003 Chevrolet Blazer

Question: My car failed emission test engine light has been on awhile

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carolyncarol, Ellicott City, MD, February 07, 2012, 08:30
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Results of emission koeo..........pass
koer..........fail
communication pass
tamper.......pass
mil command..fail
Troublecodes po128 coolant thermostat temp below po449 evaporative vent valve/solenoid cir po455 leak lg detected

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  • Answer #1

    mastertech6371 February 07, 2012, 08:32
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     Master

    128 is most likely a thermostat failing.

    the evap codes need a shop with a scan tool, smoke machine and voltmeter to determine the failure.

    Roy

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    carolyncarol, February 07, 2012, 08:42
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    Thanks will that determine po455 leak also. Is this going to be expensive?

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    mastertech6371, February 07, 2012, 09:13
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    the diag is about an hour labor with the correct tools. price?? do not know what has failed. it will not be cheap, thats about all i can say.

    Roy

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