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Re: 2012 Impala Will Not Run O2 Or Evap
Posted to Emissions Forum on 5/22/2018 4 Replies

Yes. Start the test with the scan tool. Then follow the prompts. It will have a engine running portion, a drive portion and a ignition off natural vacuum test. From my understanding most GM vehicles have it. I am sure there are exceptions. Login to read more.

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