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Hi, Is it alright to drive a car the has a faulty camshaft and crankshaft sensors? If I continue driving the car will is damage the engine?

Usually, a faulty camshaft or crankshaft sensor will mean that the car won't run. Depending on what is wrong with the sensor, it's hard to say what potential damage may result, but it sounds like something that should be attended to sooner rather athn later.

Sometimes the car doesn't start but still if I try for like five minutes it starts and drives fine. Sometimes the engine die while I'm driving. Mostly if I stop to re fill my tank then the car doesn't start. My car is a 1999 BMW 318i e46.

I'd get it fixed because eventuially it is likely to fail completely and you won't be able to start the car at all.

thank you for your information.