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If you see the check engine light on your BMW's dashboard, you'll need to use an OBD II scan tool. If you scan it and see the code 7EC, it indicates a problem with the engine control module. This code typically appears when there's an issue with the computer, leading to rough engine performance due to incorrect air and fuel signals. The best solution when this code comes up is to replace the engine control module. While a dealership may attempt to re-flash your ECM, this may not provide a lasting fix.
In a BMW, if you see Code 7EC pop up, it indicates an issue with the engine control module.