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If you fule while the engine is running or have a poor gas cap seal the problem may be logged in the bank as an error. chevy revised the ecm for that reason on the astrovan. go to autozone and have them scan the codes.
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To be sure you need to hook up a scanner and read the code when you see the light on. It's not unusual for Mini's to do this for a couple of usual reasons. One is due to the Oxygen sensor getting a short term reading that is out of the norm causing the light to come on. Various things can cause this including Injectors, mechanical condition, o-rings, even fuel changes from one station to another can trigger this on cars. It goes off later because it's a temporary issue and the car adjusts itself after so many starts. One other reason is the fuel cap not being tightened properly, that usually is fixed when you refuel and retighten the cap properly or just tighten the cap.
I have heard of this before on Vauxhall models. As the routine maintenance point is reached the service light will illuminate and performance will be reduced to protect the unserviced engine.
Once the service has been carried out the dealer will reset the service interval computer using diagnostic equipment and normality should be restored. That seems to be the theory...
The check engine light is commonly activated by a loose gas cap, regardless of vehicle make or model. Having said that, it could also be a more significant issue. You may want to err on the side of caution and schedule a maintenance.
If it's come on recently (especially if you noticed it shortly after refueling) and you don't notice any difference in the way the vehicle has been starting, handling, or otherwise operating, you can try to unscrew the gas cap, screw it back on based on the vehicle user manual or instructions printed directly on the cap (i.e. turn until three clicks, turn until hand tight), and drive the vehicle around for a few days. The light usually won't deactivate immediately after correcting the problem. You'll have to drive it around for a couple of days to a week in order for the check engine light to go away.
Have you checked the gas cap to see if it is on tight? If you purchased gas in the last couple days it might be the solution. Tighten the cap and drive a couple days to see if the light goes off. If the cap is loose, you might need a new cap.
have the vehicle scanned for "history" codes and let me know what they find. once you have these diagnostic codes in hand it is alot to decide which circuit to chase or part to replace.
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