I have a 1991 Oldsmobile 98 Regency that is showing code 41, How do I fix it?

SOURCE: 1991 olds88 1 have changed cam sensor now a code

41 is cam sensor code. are you sure the magnet is still in the cam gear? use only quality parts. if the magnet is missing, you need to replace the timing gears/chain.

SOURCE: 89 oldsmobile 98 won't start

If you suspect its a fuel problem best to do a fuel pressure test, you can rent a tester at auto zone and do it yourself. They also can show you how to use it and what pressure it should be. Also if you turn the key to on position you should hear a hum from the gas tank and then a click that is the pump running and the click is the relay, if you don't then the pump isent running, also chk. the fuse and relay, it could be as simple as a blowen fuse or a bad relay.

SOURCE: 1991 oldsmobile 98 fuel filter replacement location?

my fuel filter is located right behind the pass side tire on the inner side of the frame.

SOURCE: I have a 91 olds Ninety eight regency elite

cam sensor is only half of the cam circuit, the other half of the cam circuit is the magnet on the timing chain. the cam sensor reads from the magnet every time the engine completes a revolution,
what happens is the magnet on the chain will break into smaller piece which makes the sensor harder to read every time the engine make a complete revolution.
most likely you'll need to replace the timing chain to fix this.

SOURCE: I have a 1989 Oldsmobile Cutlass Ciera that ran

Vacuum leak