8th March 2010, 12:45
M5 Expert (>4000)
Join Date: Jun 2003
Location: Rancho Palos Verdes, CA
2003 M5 - Sterling Grey
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Originally Posted by TMcNasty
As many of you know I purchased an '03 M5 in August 2008 with 81k miles on it. The car currently has near 92k. I've never had an SES light (yes it works), but I was wondering exactly what sets it off. I ask simply because I do not own a Peake tool or similar scanner.
I guess what I'm asking is a two-part question:
Does the SES only light up when there's a 'serious' emissions problem?
Are there any meaningful codes that I could find w/ a scanner, but that do NOT set off the light?
Two part answer:
NO. It can come on due to out of spec. numbers. For example, my old 528e (a sweet ride), used to always
trigger the SES going down the north side of the Grapevine (a big hill on I-5 in Southern California). First time I stopped and checked under the hood, and everything looked fine. Restarted, and no SES. Same thing happened each time I took that route. The north side of the Grapevine is very steep and needed NO throttle ... just coast at an easy 70 to 80 MPH for many miles. Near the bottom of the "hill," the electronics saw a very, very lean mixture (DUH), and set the emissions code (and, MPG was 99.9). My Mother had the 528e for over 15 years (I sometimes drove it up north during that time), and it ALWAYS passed the smog test with flying colors.
Absolutely. Many codes that have nothing
to do with emissions. i.e., faulty siphon pump. And, the very important, holding down a seat adjustment button for too long (really, it does trigger a code, although the Peake "may" not display it, the console "secret" display does).
An M5 is NOT you Dad's kitchen toaster.
"The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge."
- Daniel Boorstin
Last edited by jclyman; 8th March 2010 at 12:47.