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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sat, Jun-24-2017, 04:36:52 AM   #1
likwidmonster
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Default 97 bmw m3 p0430

Hello. I have a 1997 BMW M3 with 138k miles and I recently had a p0430 come up. I replaced the downstream o2 sensor and then about a week later after driving spiritedly I had the code come back on again.

It seems to be due to the CAT but I haven't noticed any performance issues except a slight misfire at cold start and at times when I try to rev during the misfire it will stall out a little. Otherwise it drives and performs totally fine.

I am currently on a 10 day state inspection and need it to pass for now. Has anyone had luck with using the spark plug defoulers?

Any suggestions?
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Old Sat, Jun-24-2017, 06:14:41 AM   #2
bluptgm3
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Default 97 bmw m3 p0430

How about fresh plugs and plug/coil extenders? Have they ever been replaced?

What are your driving habits?

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Old Sat, Jun-24-2017, 12:54:37 PM   #3
likwidmonster
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Default Re: 97 bmw m3 p0430

I replaced the coils about 3 years ago and it's been driven close to 10k miles.

I replaced just the passenger bank 2 oxygen sensor a week ago.

I don't typically drive it hard and usually drive it while shifting at 3500-4000 rpm without accelerating hard.
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Old Sat, Jun-24-2017, 01:41:55 PM   #4
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Default Re: 97 bmw m3 p0430

What's with these P-codes? I've never seen any P-codes listed during any of my diagnostics seasions.
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Old Sat, Jun-24-2017, 02:29:38 PM   #5
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Default Re: 97 bmw m3 p0430

The p codes come from a generic obd scanner.

The p0430 represents Catalyst System Efficiency Below Threshold (Bank 2)
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Old Sat, Jun-24-2017, 09:14:27 PM   #6
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Default Re: 97 bmw m3 p0430

Getting an Inpa install and BMW cable is so cheap nowadays, why bother?

But if it does the job, ok I guess.
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Old Sun, Jun-25-2017, 01:15:51 PM   #7
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Default Re: 97 bmw m3 p0430

In years past I had a cable but lent to someone who never returned it... Guess I learned my lesson on that one.

For now, I just ended up using a spark plug defouler to get it to clear.

I am looking for other midpipe solutions for after this inspection.

I keep hearing people to tell me to gut the cats. Any thoughts?
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Old Sun, Jun-25-2017, 05:18:13 PM   #8
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Default 97 bmw m3 p0430

Gutting the cats is not going to solve this issue.
You could purchase the post catalyst O2 sensors simulators being sold on this vbb for now and sort out your catalyst issue later.



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Old Mon, Jun-26-2017, 12:29:33 AM   #9
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Default Re: 97 bmw m3 p0430

Quote:
Originally Posted by bluptgm3 View Post
Gutting the cats is not going to solve this issue.
You could purchase the post catalyst O2 sensors simulators being sold on this vbb for now and sort out your catalyst issue later.



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I appreciate the response!

I do understand that gutting the cats will not solve this. So far I have temporarily solved this issue using the sparkplug defoulers (creates a gap between the oxygen sensor and cat).

I was just looking for the opinion of other users about gutting the cats and then installing the simulators as you stated above.
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Old Tue, Jul-04-2017, 09:19:14 PM   #10
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Default Re: 97 bmw m3 p0430

Just a shot in the dark, but how about "rebuilding" the injectors. This I mean by replacing the little filters and external seals on the injectors. Super cheap and quite easy, maybe you got a clog and causing a running issue.

It made my M3 run better, and I had no symptoms, I just wanted to do it.

Now that I know this, it will be where I start on any running condition because it is cheap and easy... as well as spark plugs
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Discussing 97 bmw m3 p0430 in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)