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Re: Mazda U0121 after PCM replacement
Posted to Technical Discussion Forum on 7/31/2014 6 Replies

Frank are you sure You did get the same ECM back from repair? they may have send You another unit, usually those codes and no speedo problems are from wrong programming, usually a used PCM with ABS to a non ABS vehicle, however You probably can do tear tag or ... Login to read more.

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