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E90/E92/E93 M3 (2008 - 2014)
4th generation E90 M3 sedan, E92 M3 coupe and E93 M3 convertible. The last of the naturally aspirated M3s, powered by a 4.0 liter V8 making 414hp and 295 lb-ft of torque.

 
 
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Old 05-10-2019, 06:12 PM
JLHoodJr JLHoodJr is offline
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Location: West Texas
 
Join Date: Oct 2015
Posts: 10
Mein Auto: 2010 M3 Convertble
E93 catalytic converters

The warning light on 2010 M3 came on saying “excess emissions” and have engine checked soon. I took it in and both catalytic converters registered over .9 on the emissions test. The dealer doesn’t work on them, but instead replaces them - for the modest cost of $7000 (not a typo). The service advisor said to have a muffler shop take a look at them as they can usually repair them. I’ve not noticed any effect on the motor’s performance. Two questions, are replacements really that expensive? And can they really be cleaned out so they’ll function?
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