Asked in Auto Repair
Why does my Audi Q3 check engine light come on after filling up?
Documented Audi specialist sources about check-engine warnings that appear after refueling.
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German Tech Motor Works
Expert companyLouisville, KentuckyA worn gas cap can allow fuel vapor to escape after refueling and trigger the check-engine light; the documented Audi Q3 also had a frozen fuel-door actuator.
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