Question about 2003 Mazda Mazda6

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Can I replace the ecm in my 2003 mazda 6, can I

Can I replace the ecm in my 2003 mazda 6 or do I need the dealership to do it. If I can do it, can I purchase a new ecm anywhere, I have only found rebuilt/used ones?

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You can do it your self but the computer/ecm will need to be flashed. any Mobile lock smith can re flash the computer to your key for a small fee

Posted on Mar 09, 2009

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Have the fuel trims been checked? These (short term fuel trim - STFT and long term fuel trim - LTFT) can be checked with an OBDII tool, and can provide a lot of information about what may be happening. If you have a vacuum leak, for instance, the O2 sensors will report a lean condition to the ECM and it will add fuel to the engine to try to correct. You will see this in the fuel trim numbers.

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