Check engine light comes on, usually a loose gas cap or a gas cap that has lost its seal. You need to pay attention to the quality of the cover you buy from your local auto parts store, which is usually made in China and it doesn't close properly. This cover is a genuine GM part and did exactly what it was supposed to do. After about a hundred miles of driving, the check engine light went out and wouldn't come on again, and I passed the MOT with no problems.
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