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take it it a trusted mechanic. Have them hook your car up to a machine that will give you all the possiblities and start will the cheapest and work your way up until your light stops coming on...if he is agood mechanic he will tell you what I just did..that is how my mechanic does with me and he keeps my car running great(as long as I listen to him)...lol

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Q: Check engine light stays on 1997 BMW 740il have replace parts on car and recently told by dealer that cam shift sensor is bad Drove car for a day to have check engine light to come back on to stay?
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