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  #1  
Old 09-29-2014, 07:45 AM
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2011 X5 Diesel Check Engine Light

32000 miles on vehicle .....3 months out of warranty....

Saturday got the emissions light (Amber engine), and started doing some research.

Most trips in this vehicle are of very short duration.....less than 5 miles.....every great now and then, I might drive 2 hours at interstate speed, but infrequently, and the day this happened, I had 4 drives within 3 hours that lasted no more than 5 minutes each, which I am hoping is the "duration" part of this issue.

2 years ago , this vehicle was part of BMW emissions recall , and have not had any problems to speak of since then.

I checked the fault code Sunday, P2458; diesel particulate filter regeneration duration. I cleared the fault drove it reasonably hard for about 30 miles, and the light did not reappear.

Is this an issue of me not driving the vehicle enough, or hard enough, or is there something else I need to be aware of? I really hate to think of going to the dealer with this issue $$$$$$$$$$......Or do I need to go to the dealer...? Really hate to go on a withch hunt, but do not want to damage the expensive emissions equipment if this is something else......

Anyone with any experience with this?
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  #2  
Old 09-29-2014, 12:19 PM
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My '13 X5d has been flawless. I did get one check engine light at about 8K miles but it cleared itself and a few restarts. When it went in for the first service I told the SA about it. He said it was possible I just didn't tighten the fuel cap. There were no other symptoms so it didn't alarm me too much.
Prior to this car I had an '05 Range Rover and I got the check engine light maybe three times in 6 years. It always cleared itself after about five starts. I wouldn't stress about it unless it comes back. Just my two cents.
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  #3  
Old 09-30-2014, 08:53 PM
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Quote:
Originally Posted by twssas View Post
32000 miles on vehicle .....3 months out of warranty....

Saturday got the emissions light (Amber engine), and started doing some research.

Most trips in this vehicle are of very short duration.....less than 5 miles.....every great now and then, I might drive 2 hours at interstate speed, but infrequently, and the day this happened, I had 4 drives within 3 hours that lasted no more than 5 minutes each
I think your driving style is such that an active regen can not take place. Unless you can regularly drive at times for at least an hour above 45 mph this fault will probably reoccur.
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Old 10-01-2014, 01:43 AM
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Quote:
Originally Posted by ATL Markus View Post
My '13 X5d has been flawless. I did get one check engine light at about 8K miles but it cleared itself and a few restarts. When it went in for the first service I told the SA about it. He said it was possible I just didn't tighten the fuel cap. There were no other symptoms so it didn't alarm me too much.
.
"Probably the fuel cap" is a lazy SA. Bet they didnt document it on the work order and didnt read the codes, right?

I had a 2010 that had a CEL at 9k miles. The light went away, but I had it documented, read and cleared. Then at 24k through 32k a slew of issues returned. Since the code at 9k was related, when BMW bought the lemon back they wound up having to use the 9k miles as the 'start date'. I got back 93% of purchase price on a car with 32k miles.

So I recommend documenting issues. Might be nothing. SAs are trained to minimize and deflect. Lots of people let the first issue or two slide, and then have no leverage.

Oh, Ive driven over a million miles and never got a CEL for a loose gas cap...go figure. Feels like the old 'must be a batch of bad gas' story...
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Old 10-01-2014, 09:57 AM
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Quote:
Originally Posted by ingenieur View Post
I think your driving style is such that an active regen can not take place. Unless you can regularly drive at times for at least an hour above 45 mph this fault will probably reoccur.
Actually regeneration happens at lower speeds-around 35 Mph.
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Old 10-01-2014, 11:18 AM
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Thanks for the information, Ard. I hope my X5 doesn't repeat what your lemon did! I will document each anomaly from here on out. Happily there have been none.
When I think about the circumstances around the appearance of the light, it was also during a period when I was doing many short trips. Which points again to the regen.
The SA was really attentive and even gave me a free quart of oil in the snazzy BMW zipper pouch. I will review the paperwork to see if my mention of the check engine light was documented. Good stuff on this forum!
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  #7  
Old 10-01-2014, 01:28 PM
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well......its back.....

CEL came back on....P2458 Diesel Particulate Filter Regeneration duration,

and a new one...

P205b, Redundant tank temperature sensor circuit range/performance.

Guess I will suck it up and take it to the dealer........

ughhh.!!!!!!!!!!
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Old 10-02-2014, 09:26 PM
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Originally Posted by bawareca View Post
Actually regeneration happens at lower speeds-around 35 Mph.
The OP issue is his driving style - the drive cycle must be long enough to complete a regen on a regular basis. Diesels do not monitor the gas cap or fuel system tightness.
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Old 10-02-2014, 11:35 PM
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^ but the SA said it was prolly the gas cap.... how can they be wrong?

(Interesting tidbit that EVAP monitoring is NOT done on diesels. thx... I looked it up a few places and it appears indeed only for gasoline)

OP- I would play dumb with BMW. Dont give them excuses to deny. No "I just drive 20 feet a day"...if they ask, fine- dont volunteer. Just 3 months out of warranty they may get BMWNA to cover repairs. A new DPF and or Cat can be many thousands (4+). even the temp sensor in the DEF tank is a lot.

GL

report back
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  #10  
Old 10-06-2014, 05:36 PM
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update

Took the x5 to the dealer today....bottom line, replacing the active tank (sensor is integrated with tank), and BMW is covering this as goodwill.

I actually spoke with the SA and the Tech today, and the Tech looked at the codes I had and description, and was certain he would get the same thing....apparently he did. I will post additional info after I get the vehicle back tomorrow, and have had a chance to review the work orders/reports.

Looks like I got lucky.........

Last edited by twssas; 10-06-2014 at 05:42 PM.
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