1998 BMW 540i emissions failure

1998 BMW 540I
97,685 MILES • V8 • 2WD • AUTOMATIC
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HA1381
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ive done a major tune up on my bmw changed all sparkplugs, ignition coils, oxygen sensors, mass air flow meter, radiator and oil after this i drove the car roughly 600 plus miles as required by manufacture afte this i drove to get an emissions test and it failed
my ? is why did it fail doing all that i did.
May 6, 2009 at 9:34 PM
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DOCHAGERTY
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What failed, tell me the numbers.
May 9, 2009 at 5:23 PM
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CHARLESTHIELE
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There were lots of problems with catalytic converter failures on these early 540i's, my 97 had both replaced while under warranty and I wound up buying another set recently as one of them started rattling. I made things worse for myself by cutting off both stock ones and trying aftermarkets (Magnaflow are junk) which burned up in < 2000 km. I changed mine before I even started having emission problems or check engine codes because of the rattling. Stock ones are very $$ but a variety of shops agree they are the only option for reliable performance on the M62 V8 engines.
May 29, 2009 at 4:06 AM
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DOCHAGERTY
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Stock BMW cats are expensive. The aftermarket has some good parts, Magnaflow is a brand I have not tried, thanks for the heads up.
May 29, 2009 at 8:06 AM