Question:

Does PCM ECU ECM number on a replacement part have to much exactly on a 99 mercury cougar?

by  |  earlier

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Lots of engine computers with different part numbers for this model, so trying to figure out how important that is. Thanks for your help!

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1 ANSWERS


  1. yes it does...but u may be able to have a non-mathching unit

    re-programmed to your model.

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