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 Oldsmobile 98
Average mileage: 141,144 (106,433–160,000)
10 people reported this problem
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the interrupter fell off.
I bought the car this way.I will fix it myself soon!!!