new cat


Asked by Jul 15, 2014 at 05:19 PM about the 2009 Chevrolet Cobalt LT1

Question type: Maintenance & Repair

At the end of April had new cat installed  went to get car inspected and i have no check eng light but it wont pass because the computer from the state say's my cat and evap have not been reset not sure what do? Do the o2 sensor have anything to do with this?????

2 Answers


I work on many different makes and models of cars. Yours is not to complicated. Often times you wont have a DTC set even though there may be an issue with emissions. Do you know how the Evap system works? If you do I suspect the EVAP canister is restricted. Or if you have a intermittent condition it could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent solenoid valve inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill condition. These are your first indicators to check. There are specific tools that will enable you to make a proper system test, but I wont get into that unless you post again. Regards, Mark

1 out of 1 people think this is helpful.

Thank you i will look at thoses

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