Question about 2001 BMW 5 Series

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I have had my 2001 x5 in the shop for a service engine light . First they replaced the thermostat, then the oxygen sensors now they are telling me both catalytic converters are bad. The vehicle has just 82000 miles on it. Could it be possible that both catalytic converters are bad?

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  • cchandonnait Oct 08, 2009

    It is a 3.0 2001 x5. I have called the dealership yet again. The code that has come up in the past is catalyst lean fuel mixture in bank 2. I will call and try to get the new code that has come up. I feel like they are just guessing at my expense. Thanks and I will get back to you to let you know what I find out.

  • Efstathios Govas May 11, 2010

    i suggest you call the dealer,some car companies cover the converters for 80k or 100k,so it might be worth it to contact them,and the possibilities of both converters being bad is slim to none,it sounds like this shop is guessing and taking you for a ride at the same time,what are the codes in the vehicle?? engine size?? let me see if i can steer ya in the right direction



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Not enough info, but go to another garage and do not tell them what the other shop said.

The only thing that could usually make both converters fail at the same time would be if they were exposed to something bad, like antifreeze from a bad head gasket, burning oil, or some kind of fuel additive that harms converters and O2 Sensors..

Posted on Oct 08, 2009

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Yes it could be possible that both cats are bad,,there is a faderal warranty on them for 8 years or 80000 miles because they cost sooo much $$,i would try to talk to the bmw service manager and see if he/she will work with you being you only have 82000 miles,only 2000 miles over the warranty and you spent alot of money there they may help you,,,,good luck

Posted on Oct 08, 2009


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Bmw x5 abnormal light engine fault light

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Check Light & Codes for What?

You look up the codes,diagnose the system
the codes point to

I don't know what codes you had or why the O2
Sensors were replaced

Codes don't tell you to replace anything

Have you not gone to a repair shop to have
whatever the problems are properly solved?

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Hi, no, they are not related. The oxygen sensor(s) are part of the ignition/emissions sytem and help regulate fuel flow/mixture. The A/C system is self contained and does not affect other engine systems. Mike

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