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The emissions part of your state inspection failed What is the most common cause?
Wiki User
∙ 15y ago
Most common? Probably the oxygen sensor.
But that's like asking your doctor, "what's the most common cause of a bellyache?" Usually it's gas but if it isn't, then what.
Don't guess. Find out what failed the test, look at the sheet that they gave you, it usually has a reason for the failure.
You don't give any clues, so I don't know the year of the vehicle, but if it's EFI you can connect an automotive code scanner to find out what the computer has to say on the subject. That's actually your best first step.
You can borrow, rent or buy a code scanner at most auto parts retailers.
Wiki User
∙ 15y ago
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only in California
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Will bad oxygen sensors cause me to fail the emissions test?
Problems with the oxygen sensors are quite likely to cause emissions test problems. The car computer cannot properly adjust the air/fuel mixture to regulate the emissions.
