Sometimes an O2 sensor fails, and you need to replace it. 8 M52 Increase horsepower and torque with a 7K rev limit and no top speed limit. ![]() But more importantly, owners typically dont need to reset ECUs. BMW 5 Series E39 525i 192HP ECU Tuning Remapping Programming If you are interested in getting the most out of your BMW 5 Series you may probably heard of engine tuning techniques.
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