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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 09-23-2012, 02:56 PM   #1
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Join Date: Apr 2004
Location: Owasso Oklahoma
Posts: 48
My Ride: 04 BMW 330CI
e46 M3 Limp Mode after Euro Headers

So I installed my euro headers this weekend with a new CRT from Custom Performance Innovations, 200 Cell Cats and EGT bung.

I was very careful to install the 02 sensors properly, the two side by side at rear of valve cover, A, the furtherst right is bank 1-3 precat, the other is 4-6 precat. The Post cat 02s on the side of the engine, along with the EGT were removed from the harnes and routed down the right side of engine. Everything is tucked away safe from heat.

I finally finished and anxiously fired it up, and to my dismay, rough idle. I restarted car 5 time to get the check engine codes.

No 02 errors........

1b69 Engine coolant temp
1b90 fuel control bank 1
1b91 fuel control bank 2
1bcd warmup misfire cyl 1
1bce warmup misfire cyl 2
1bcf warmup misfire cyl 3
1bd5 warmup misfire multiple cyl

This is all so far.......but it results in massive limp mode.

Any thoughts?
- Xanthoxx

Last edited by Xanthoxx; 05-30-2013 at 12:51 AM.
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Old 09-23-2012, 07:16 PM   #2
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Join Date: Aug 2009
Location: gross deutsches reich USA
Posts: 665
My Ride: 323i with S54
you switched the 02 plugs. You plugged bank 1 into bank 2 and other way around.
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Old 09-23-2012, 07:20 PM   #3
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Join Date: Apr 2004
Location: Owasso Oklahoma
Posts: 48
My Ride: 04 BMW 330CI
I just pulled it all apart again to make sure... Plug A at rear right of valve cover, the far outside one closest to driver is bank one and it is in my long header, cyl 1-3. Additionally they can only be swapped at the header since the plugs are different on the car harness. But to ensure I unhooked and removed both, and ran "A" to the long header to ensure before hooking up the second.

The reason I say this is there is a 1 on the A harness (shown on black plastic, hard to see) on far right rear, that should correspond to bank 1.

Still limped.
- Xanthoxx

Last edited by Xanthoxx; 09-23-2012 at 09:00 PM. Reason: .
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Old 09-23-2012, 10:38 PM   #4
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Join Date: Apr 2004
Location: Owasso Oklahoma
Posts: 48
My Ride: 04 BMW 330CI
Picture Wrong

Ok so I swapped my precat o2s and the car stayed out of limp mode while driving around the block.

Apparently the picture I used has the precats swapped but it is still odd that the wire marked 1 is for the short header rear bank cyl 4-6. dunno:
- Xanthoxx
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Old 09-23-2012, 10:53 PM   #5
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Join Date: Jun 2012
Location: Reno
Posts: 21
My Ride: 01' E46 M3
I have a sensor diagram if you'd like a copy just shoot me a PM with your email. I had trouble sorting this out too, but dodged the limp mode.
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