misfire and power loss tried injector cleaner now i hear a little rattling from on 2005 BMW 645Ci

engine what should i do next

by in Los Angeles, CA on March 04, 2012
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1 answer
ANSWER by , March 05, 2012
See if you can get the codes pulled from the DME (engine control module). Power loss (especially at higher RPMs), misfiring and rattling sound could be a sign of catalytic converter failure.