Skip the auto shop - Our mechanics make house calls

Q: Can't pass smog check due to misfire

asked by on

I keep failing my smog check. My engine is also misfiring.

A: If your engine is misfiring it will not pas...

If your engine is misfiring it will not pass a smog check. The engine needs to be in good running condition in order to pass. I suggest having an expert mechanic, such as one from YourMechanic, inspect why your engine is misfiring and help you pass the smog test.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car misfires after distributor, rotors, plugs, plug wires replacements. 1999 GMC Savana 3500

Although the person who serviced your vehicle the first time did not repair the issue, I think he might be correct about the fact that it could be an intake manifold gasket or a fuel pump issue. You may...

Q: Idling problem

Hi There, Depending on how long this condition lasts, you may have either a faulty or dirty idle air control valve or a problem with the enrichment process when the car starts up in colder weather. If the condition goes...

Q: Car won't pass smog.

The path to pass emissions will depend on what part of the emissions test (carbon monoxide (CO), oxides of nitrogen (NOx) or hydrocarbon (HC) levels) were out of tolerance. There are different components, and tuning/repair activities required to address each....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...