1989 BMW 535i Repair Question
BMW engine management
Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
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The engine management system used on that particular vehicle is usually quite robust. In this case, it is most likely the Oxygen sensor and it is setting the light because of its age and response time. If the Oxygen sensor does indeed require replacement, use the Bosch original equipment unit, other manufacturers sensors have slightly different calibrations that can sometimes cause trouble. At 220k miles, it is probably time to have an overall inspection performed as well.
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