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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-17-2011, 06:37 PM   #1
Recon2005
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Join Date: Jun 2010
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My Ride: VF-E 328Ci & 325 E90
Headers with cat converter - P0430 code.

I bought the car with ebay headers. PO installed a cat sometime after the original header install, but chose not to relocate the post cat O2 sensors downstream of the new cat. He simply plugged the bungs downstream of the Cat with a couple of non wired junk O2's. For the life of my ownership I have dealt with P0420 and P0430 codes. No big deal, but now I have emissions testing due in a few weeks.

I don't think PO used anti-seize on the threads so I took the car to a local indy. He was able to remove the junk O2's as well as relocate one of the good O2's but had to cut bait and install one new O2 sensor in the remaining post cat bung. He used one junk O2 and the stranded good O2 to plug up the now vacant bungs in the header. He also cleared the SES.

Made a 360 mile trip this weekend and 50 miles from home on the return trip the SES light came on. This time the only code that came up was P0430. So wise men of E46...after I trace back the new O2 to the corresponding location in the engine and verify this is bank one, can I assume the bank two O2 sensor is bad? My thought is that if the cat is bad, both codes would have come back on both banks. Car has 160K on it and I am thinking that it is feasible that the O2's could go bad.

Thank you gentlemen in advance...Mark
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Originally Posted by Forcefed M3 View Post
Could not agree more. I enjoyed my vf kit to the day I took it off. VF best s/c out there. Period
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Old 07-17-2011, 07:09 PM   #2
TxZHP04
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Many who add cats downstream of the headers still find that they get codes, even if the cats and O2s are all working. While they may be fully functional, they may not be providing the response the DME is expecting of a stock exhaust. So maybe you have a bad O2 sensor, maybe you simply have a bad cat configuration.
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Old 07-17-2011, 07:39 PM   #3
Recon2005
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Thanks for the repy. I was just doing some additional research on this and it seems you have quite a bit of insight and experience on the subject. In fact I was about to PM you. Is the issue with the relocation of the cat have anything to do with the length of the wire loom? I'm asking this because my loom was not spliced to be extended, it was simply unravelled from under the valve cover.

My next question is would a defouler have any benefit or am I coming at this in an incorrect mindset? For what it's worth, I am boosted and have the Magnaflow exhaust offered under the group buy. Thanks again...
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Originally Posted by Forcefed M3 View Post
Could not agree more. I enjoyed my vf kit to the day I took it off. VF best s/c out there. Period
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Old 07-17-2011, 07:51 PM   #4
TxZHP04
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Has nothing to do with the length of wire nor splicing. Defoulers aren't a reliable solution either. The problem is with the placement of the cats themselves and the fact that they are now much farther from the exhaust ports in the head. The only 100% reliable way I've seen to deal with missing or relocated cats is to wire in an Innovate LC-1 to simulate the proper response from the post cat O2s (there's a thread or 2 here with instructions). Anything else is a gamble as to if or for how long it will work and a complete waste of time and effort IMO.
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Old 07-17-2011, 08:15 PM   #5
Recon2005
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LC-1 looks like a great long term, permanent and proper fix. At this point I am reserved to simply pass the local emissions testing which is only an OBDII plug in, no sniffer. Again, I appreciate the help.
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Quote:
Originally Posted by Forcefed M3 View Post
Could not agree more. I enjoyed my vf kit to the day I took it off. VF best s/c out there. Period
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