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Thread: 29F4, 29F5 cat converter code

  1. #1
    Junior Member
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    29F4, 29F5 cat converter code

    Hello... Looking for some advice pls..
    Has anyone come across error code 29F4 29F5 catalytic coverter conversion?
    Got a rough idle one morning, like a misfire, on the E61.
    It's a 523I 2.5 n52 engine auto.
    I did not get a engine light on, gave it a couple of revs and it was sound.
    Plugged it in a got these two codes.
    I cleared them but they come back every couple hundred kms. Two days ago a engine light came on, it was running fine, plugged it in again and got the same codes.
    I have replaced the MAF, disa valve, 4 02 sensors (pre and post cats)
    I'm suspicious of it being the cats, 2 cats blocked at the same time? Two codes for two cats? Car has 184000 kms on it...
    Any advice would be great
    Tks

  2. #2
    BMWHaus Guru
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    Looking around it appears there can be many causes for these including bad fuel, air leak, faulty sensors, faulty wiring and the least likely is two fails cats.

  3. #3
    Junior Member
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    Quote Originally Posted by rebel.ranter View Post
    Looking around it appears there can be many causes for these including bad fuel, air leak, faulty sensors, faulty wiring and the least likely is two fails cats.
    Tks rebel....
    Any sensor I have replaced are always oem.
    MAF, camshaft, crank all VDO or genuine BMW disa, bosch O2.
    I didn't think the fuel filter can be swapped out, built in unit I think. Ccv all replaced with genuine BMW.
    BMW rocker cover gasket... On and on.
    Might look at the old reliable fault of airleak

  4. #4
    Junior Member
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    I got a few bottles of cataclean today, gonna throw it in over a few months and see if that cleans out the cats

  5. #5
    Junior Member
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    After two bottles of cataclean over a month and a half the codes are still coming back. Sometimes triggering off the check engine light. ...
    Anybody ever get these codes? Really don't wanna go down the road of replacing both cats.
    Tks

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