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Consumer Assistance

Chevy Silverado truck does it need a muffler to pass smog?

Does my truck need pipes coming from the outlet on my muffler to pass smog check?


The smog test does not test the muffler. However I don't recommend you take your Chevy in for a smog inspection with anything wrong with it, it may cause the smog technician a problem with inserting or keeping the emissions probe in place.


One other thing to consider is smog machines in California are calibrated once every three days, taking in a sample of ambient oxygen levels. This calibration disallows the testing of vehicles which emit oxygen levels exceeding preset base limits. In other words, if any problem with your muffler causes more oxygen to enter the smog machine then that emitted from your Chevy's exhaust stream, the test results would be altered; the smog machine may even not allow the inspection to begin or continue.

posted by SmogTips Support 06-26-2010 01:27 PM

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