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Can I drive with a bad glow plug? As you know, the diesel glow plug plays a vital role in making this ignition a success. If the plug is not functioning properly, there will likely be a misfire during ignition. You may still be able to drive your vehicle, but you will experience a downgrade […]

The answer is : Decreased fuel efficiency. Difficult acceleration. Engine misfire. Hard starts or no start at all, especially in cold weather. Loss of power. More smoke emitted from the vehicle than normal.

If the BMW has diesel engine, then the answer it is and it need glow plug which is same function as spark plug in gasoline engine.