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| 08-08-2024, 01:24 PM | #1 |
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Relocating secondary O2 sensors
I installed VRSF cat-less downpipes and relocated the secondary O2 sensors behind the secondary catalytic convertors. Unfortunately I'm still getting a check engine light. Anyone else have the same experience?
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2011 BMW Z4 35i 6sp wh/rd
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| 08-08-2024, 03:54 PM | #2 |
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i heard tuner will fix that
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| 08-09-2024, 06:16 AM | #3 |
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Clever idea, but seems it did not work. MHD Stage 2 tunes will get rid of these errors. There is also some sort of n54 downpipe fix you can buy aswell, but that is meant to be used only short term, say to pass inspection and then should be taken off the car.
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, Forge DV-s, Masata Chargepipe, KW V3 suspension, M3 front control arms, Hardrace RTABS + balljoints, Michelin Pilot Sport 4S tires.
Last edited by KennyP; 08-09-2024 at 07:06 AM.. |
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| 08-22-2024, 10:49 PM | #4 |
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I’ve had success with o2 sims. But if you plugged behind the secondary cat and you just need a little more ‘filtering’, you should try placing a mini cat. You only need 1 so you can sell the other. FWIW Fabspeed sells these at double the price
https://shop.2mfabrication.com/produ...converter-pair
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| 08-26-2024, 04:11 PM | #5 |
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Mini cats won't pass the visual, but I've installed the downpipe fix and currently working though trying different setting. It didn't help set on the default (which was expected). Hopefully I'll have more to share in a couple of days.
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2011 BMW Z4 35i 6sp wh/rd
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| 08-27-2024, 07:17 AM | #6 |
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Five drive cycles with mixed city and highway and no check engine light. Fingers crossed.
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2011 BMW Z4 35i 6sp wh/rd
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| 08-30-2024, 08:27 AM | #7 |
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My wife drove the Z4 to work which is a longer highway drive and the light returned. So, close but not perfect.
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| 09-09-2024, 06:54 AM | #8 |
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I adjusted the voltage on the O2 sim and have had no check engine lights except for the random light when my wife drove the car. I have also passed the state inspection, so all is good.
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2017 BMW M4 Comp DCT blk/blk 2001 Porsche 911 Turbo 6sp blk/blk |
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