So I failed my emissions test today. The hydrocarbon and nitrous oxide levels were all under the limit, but the CO% (carbon monoxide) was way over. They said that they could do a diagnostics test on it, but it would cost me another $75 on top of the $37 they charged me for the test. I was just wondering if anyone knows what the problem might be. I've chaged the air filter and oil just last week and the spark plugs are pretty new.
Thanks
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