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.
Check Engine Light Due to Cam Sensor Interrupter Fault on Buick LeSabre
Average mileage: 120,120 (72,000–198,480)
13 people reported this problem
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my check engine light stayed on every time i got the cam sensor replaced. i took it to an electrican come to find out they had to replace the timing belt to ened up costing me 450 dollars to fix the problem
The Service Engine light comes on randomly when slowing the car down.