Buick Regal Problem Report
Buick Regal Check Engine Light Due to Cam Sensor Interrupter Fault
The cam sensor interrupter (magnet) may become demagnetized and/or fall off of the camshaft gear causing the Check Engine Light (Service Engine Soon) light to illuminate. On higher mileage vehicles it would be advisable to replace the timing chain and gears if this problem were to occur as the timing cover must be removed to replace the interrupter.
problem with gas gauge when quarter level it drops fast to indicator light - shellbell
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Illumination of the Check Engine Light can be caused by a loose or worn gas cap.