Quote:
Originally Posted by Red335i
I had plugs installed at 30,000 miles. I got the dreaded drivetrain malfunction & flashing check engine light at 41,000 miles. I took it in to bmw and the tech says #4 plug is misfiring. The work order says to change not only #4 plug but all plugs. Now I question whether they really changed the plugs at 30,000 miles.
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Most of the techs are honest. The guys who don't actually do the work get weeded out pretty quickly. Your plugs got changed. Maybe #4 plug was damaged during service.