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Strange noise for sure. Now that the noise is gone, have you noticed if it is low on power or significant change in mpg? Did you just change one spark plug or all of them? If only one, why? And are you sure you replaced it with the same plug as the others and the proper gap? The engine's computer will adjust to some sub-optimal conditions after a while and wont throw new codes, even though its not working at its best. I think the easy answer is that either something is wrong with the spark plug(s) you replaced and/or something didn't get put back together properly.
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Current: 2020 X5 x40i M-Sport, Arctic Grey Metallic / Ivory White, Executive Package, Luggage Compartment Package, Integral Active Steering, Tow Package, Parking Assist Package, Driving Assist Package, M-Sport brakes, Tux Mats
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