Questions tagged [emissions-testing]

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Is this MX-5 running too cold, and could that explain poor emissions?

Last year my MX-5 NC struggled to pass its emissions test. 5 years ago I replaced the front cat exhaust manifold with a 4-1 non-cat manifold, moving the oxygen sensors around the remaining mid pipe ...
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I/M Readiness Test: How to know if I WILL pass emissions test?

My OBD monitor showed all as OK. My manual says that this means "monitor has completed diagnostic testing." During the emissions inspection, will the mechanic just plug a similar device into my car ...
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Star Smog Checks

I have an MR2 Spyder with 80,000 miles on it runs great but the check engine light is on and the smog technician stated that even if I reset the check engine light it would still not pass smog no ...