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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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Originally Posted by ozarkmark
About 6 months ago, the dealer discovered a fault code stored in the computer. The code was, "Catalytic Converter for Cylinders 1-3 below threshold efficiency." No big deal, it can wait to be replaced.
I have the Bavauto round ODB tool and have been resetting the Check Engine light/ clearing the code (11- E9) since it first started. The code reappears every few thousand miles and the cats make a horrible racket at idle and warming up in the morning.
Fast forward to present. I have ordered 2 Magnaflow 53004 universal cats to replace BOTH for $110. The Midas shop said they will install for $75-$100. Yes, I looked at the direct fit, and considered taking it to the dealer for OEM but I don't think $1,800 for the dealer is reasonable for a SINGLE cat.:
Now, I haven't received these magnaflows yet and wanted to ask for everyones opinion on this. Has anyone else done this? What kind of experience are you having? What would you have done different?
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Originally Posted by superdeadman
1800? what kind of dealership are you going to?
the "we rape you more than any other bmw dealerships" kinda one?
Originally Posted by Eric S.
I hate to pass along heresay, but I recall reading on other forums that there is increased risk of "check engine" light issues when using anything other than the OEM cats. I suggest you try a search on Roadfly.com:
I don't blame you for wanting to go with the Magnaflows, just do your research and be prepared.
And if you do stick with the M-flows, let us know how it turns out and whether you have any check engine light problems.
Originally Posted by nukeduster
I put on some aftermarket cats on my z3 and the check engine light didnt come on again for about 2 months, then after that, every other drive cycle it will go on, then off, on then off with the threshold efficiency being the code every time.
You CAN use aftermarket cats, just make sure you use OBD-II rated cats, made for use on euro cars. I didnt because I was in a hurry but there are specific ones out there that have the o2 sensors directly before and after the cats, and thats what you need. They are more expensive, but wont have the check engine light come on.
Originally Posted by Eric S.
Awesome! Let us know how it does over the next week or so and whether you see any CEL!! I'm now at 124K miles on my 1999 540/6 and still have the original cats. Hopefully they'll last many more years, but in case they don't, I can always copy your solution!
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