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E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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Old 7th March 2012, 16:31   #21
bibledriver
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Good, I would replace the 02s for sure and see if that fixes it, its likely necessary anyhow, and may fix the issue. An 02 that is on the fringe, could just give poor readings, but since not "bad" /broken, wouldn't give its own fault code. We'll see if you get your codes read what they say. And seriously, crazy if they replaced cats without testing/ replacing post cat 02s, but hey, that's just me.
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Old 7th March 2012, 16:36   #22
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I am happy to help you read the codes, which we can then write down. You can then post on the board and ask for help. I'm not an expert at CATs or all the things that trip the CEL, but there are people on the board who are.

I highly encourage you not to pay for another new set of CATs until you get to the bottom of this. A 2003 M5 should't need 3 sets of CATs. If you put a new set of CATs on the car you're likely to ruin them again until other problems are fixed.

I'm out of town until end of the week. You can drop by on Saturday. I live between Brookhaven and Dunwoody. I'll send you a PM with my contact info.
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Old 7th March 2012, 16:40   #23
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If you are going to own the car any length of time, you should invest in one of these Peake readers. They specifically read BMW fault codes that the other diagnotic tools won't. It will pay for itself many times over.

It is easy to use. My mother could use it.

Go to Google shopping, find the best price, and order one.
Peake Research PR-R5-FCX-3-16 BMW Scan Tool 2001-2007

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Old 7th March 2012, 16:52   #24
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Quote:
Originally Posted by Georgia M5 View Post
If you are going to own the car any length of time, you should invest in one of these Peake readers. They specifically read BMW fault codes that the other diagnotic tools won't. It will pay for itself many times over.

It is easy to use. My mother could use it.

Go to Google shopping, find the best price, and order one.
Peake Research PR-R5-FCX-3-16 BMW Scan Tool 2001-2007

Thanks Georgia!!
I just sent you a PM with my contact info as well.

I will look into purchasing a Peake reader, I definitely need one.
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Old 7th March 2012, 17:26   #25
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Just to map it out better, we'll see the peake codes later,

Intermittent CEL for bank 1 cat
New cats recently installed,
original 02s (so far as you know),
mileage?
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Old 7th March 2012, 17:56   #26
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I have a lift in my gagrage, so if necessary we can put his car up in the air and check for exhaust leaks. I have one of those exhaust stethoscope thingys, too.

What else should we check/look for if I put his car up in the air?
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Old 7th March 2012, 18:41   #27
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I have a lift in my gagrage, so if necessary we can put his car up in the air and check for exhaust leaks. I have one of those exhaust stethoscope thingys, too.

What else should we check/look for if I put his car up in the air?
Sounds like a good plan to me, I hear that cracks around the 02 sensor bungs can cause some headaches, so maybe spend some time checking around there closely. I cant think of anything unless you see something crazy staring you in the face.

Other thoughts? . . .
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Old 7th March 2012, 18:52   #28
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Sounds like a good plan to me, I hear that cracks around the 02 sensor bungs can cause some headaches, so maybe spend some time checking around there closely. I cant think of anything unless you see something crazy staring you in the face.

Other thoughts? . . .

Are the O2 sensor bungs part of the CATs? In other words, does that part of the pipe (bungs) get replaced with the CAT? I can't remember. I know they are immediately before and after.
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Old 7th March 2012, 18:58   #29
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Are the O2 sensor bungs part of the CATs? In other words, does that part of the pipe (bungs) get replaced with the CAT? I can't remember. I know they are immediately before and after.
well, I couldn't remember either, so RealOEM.com * BMW E39 M5 Catalytic converter/Front silencer

That seems to be one part with the cats, sensor bungs part of the cat replacement . . .
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Old 7th March 2012, 19:03   #30
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louiscipher1965,
Are the new CATs that you had put on the car OEM BMW or aftermarket CATs?
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