i will fill up the gas tank on monday and by wednesday its on a quarter of a tank. what causes this?

5

Asked by Sep 20, 2014 at 05:26 PM about the 2006 GMC Envoy Denali

Question type: Maintenance & Repair

5 Answers

37,665

Do you have a CEL light on the dashboard? The place to start is the emission system, like the O2 sensors.

Best Answer Mark helpful
5

Which o2 sensor would it be the upstream or downstream

37,665

Change them all at the same time. In my experience if one go's your other ones are not far away from failing and you'll be back under the vehicle again.

37,665

BTW. Don't use the universal O2 sensors. They are crap! Use the same kind that came out of it.

5

Alright thanks

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