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02-20-2023, 10:50 PM | #1 |
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Modded S54 E86 Z4 M Coupe - Codes 29F4 and 29F5 - Catalytic Converter Conversion ??
Hi everyone, I have a "Service Engine Soon" light on my dash and was looking for help on these codes that I pulled:
0029F4 - Digital Motor Electronics (DME), catalytic converter conversion 0029F5 - Digital Motor Electronics (DME), catalytic converter conversion 2 The car has a Schrick 288/280 cam, Eventuri intake, Supersprint headers, & Rpi Exhaust for the motor mods. Bad O2 sensors? Bad cats? Bad something else? Haven't been able to find much about these exact codes for the S54 online. Also, not sure about the alternator code 2E97, but that could be because I didn't have the car engine running and only on ignition position 2 during the reading of the codes. Thanks in advance! |
02-21-2023, 05:17 AM | #2 |
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Do you have the stock cats in the section 1? Did you relocate the post cat o2 sensors after the cats in the section one after header install?
Those codes mean your cats are not working fine. I have them, but my cats are aftermarket and not as effective as OE. |
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02-21-2023, 09:06 AM | #3 |
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I'm not sure, I'll have to get under the car and take a look. This is a "new to me" car, so I'm still exploring the car. Do the stock cats have BMW markings on them or anything else to validate that they're OEM vs high-flow?
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02-21-2023, 09:53 AM | #4 |
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There are 4 cats in the stock setup - 2 in the headers and 2 in section 1 (as indicated by maupineda). The original locations of the O2 sensors are in the headers. Since you've got catless headers, the O2s should have been relocated to the section 1 cats. So make sure you first have OE cats in section 1, then look and see if the O2s are there.
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03-13-2023, 03:07 PM | #5 | |
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Youtube video of the underneath of my car showing the O2 sensor locations: https://youtube.com/shorts/VWJaXc6EL8M?feature=share |
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03-13-2023, 07:24 PM | #6 |
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Garage List F15 X5 xDrive35i [8.75]
E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.08] |
Everything is working fine as expected. You’ve got codes because you’re running catless supersprint headers. In the absence of primary cats, your o2 sensors think the cats are not functioning when you simply don’t have any.
Others here have avoided codes by relocating the sensors to the secondary cats. You can hack your existing and weld in o2 bungs or buying a set of secondaries that come with bungs. Good thread with pictures: https://www.zpost.com/forums/showthread.php?t=521081 Last edited by 3002 tii; 03-16-2023 at 01:01 PM.. |
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03-13-2023, 07:37 PM | #7 |
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is very clear your O2 post-cat sensors are placed before the cats, and not after, so the downstream sensors see the same gases as the upstream ones; the car's ECU interprets this as faulty cats.
you need to move the 02 sensors after the cats, this means you need to modify your cats to add the bungs and install the downstream sensors after the cats. also, your two downstream sensors are on the same header, it should be one per bank. |
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03-16-2023, 09:42 AM | #8 | |
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04-11-2023, 12:08 AM | #10 | |
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Garage List F15 X5 xDrive35i [8.75]
E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.08] |
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You should google area 74 o2 simulators. I used those on my n52 coupe and was able to pass emissions. It would occasionally trip a CEL when I did WOT runs but it did the trick for emissions. |
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