Peake Codes...Help! - The Unofficial BMW M5 Messageboard (m5board.com)

JAKPAK · 20th December 2007, 02:39

I am the new owner of a 2000. I bought it with 57,500 and put about 1,000 on it in the last few months. Today I had the SES light turn on; I used the Peake Reader and was given the following codes:
Chart 18:
Code AE
Code b2
From what I've read, AE means Air-Fuel Adaptation, Cyl #1-4, and b2 means Catalyst system efficiency, cyl # 1-4

Can anyone help me with what the problem may be?...anyone have experience with these codes? And, if so, how much did it cost to fix?

Thanks for your help!

DouglasABaker · 20th December 2007, 03:17

B2 sounds like an O2 sensor.

AE I just don't know...

d-

drfv · 20th December 2007, 03:55

both could be possible result of a misfire iirc.

gherardini · 20th December 2007, 08:16

there's a sticky post here...

Knowledge base on Peake codes for E39 M5

that we are trying to keep all the peake codes listed in. check there, list yours and add to our online "database" of knowledge.

RoundelM5 · 20th December 2007, 11:48

b2 can also be thrown by exhaust leak (at least it was for me) - which may be the culprit if you have an aftermarket exhaust...or a bad cat - though I doubt it at less than 60K miles

JAKPAK · 20th December 2007, 14:47

Thanks for the replies. As a new owner there are a couple of things that I have noticed, that I just assumed were unique to the M5. For example, I have noticed that the smell of exhaust is very strong when starting cold. In addition, when starting cold I have noticed that for about a minute, while warming up, the engine mildly idles up and down. Are these cause for concern?...possibly connected to the codes?

Thanks again!

DouglasABaker · 20th December 2007, 15:21

The idle hunt is normal...

I don't specifically recall noticing that my M5's exhaust is any stinkier than any other vehicle I've ever owned...

d-

JAKPAK · 20th December 2007, 17:24

Thanks Doug!

Anyone else ever have these codes? Thanks!

gsfent · 21st December 2007, 04:59

Quote:

Originally Posted by DouglasABaker

The idle hunt is normal...

d-

Interesting. Mine is rock steady, just elevated when (what passes for) cold here in south Florida. About 1100, then settles down to 600. Checked MAF's?
Regards,
Jerry

emccallum · 21st December 2007, 05:22

you may want to reset the codes and see what comes back first....as said earlier O2 seems to ring a bell as b2. I do recall teh first time I used my Peake I had a hard time figuring out the tables. If it turns out to be an O2 just replace both precats..thats what I did around 40K