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Chevrolet TSB #21-NA-124
2004 Chevrolet Trailblazer
![CarComplaints.com Seal Of This Might Hurt](http://cdn2.carcomplaints.com/img/seals/bad.png)
TSB Document:
Affected Component: ENGINE AND ENGINE COOLING
- Summary
- This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set.
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