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  #1  
Old 10-02-2016, 06:20 AM
grr grr is offline
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Dynamic drive failure

I recently bought a loaded one-owner low mileage 2007 X5. After just a couple of months I had a leaking rear air spring. Replaced both thinking I might just be unlucky. Well, a couple of months has passed and now I have a Dynamic Drive failure message showing up about every 3rd time I start the car.

Diagnosis reads:

DYNAMIC DRIVE (ARS) (ars_70) 4 faults
6276 Predrive check
5D5B Pressure build-up, front axle, faulty
6271 Predrive check
5D50 Supply, pressure sensor, front axle

First thought was to replace the pressure sensor (or at least diagnose it), but looking into ETK it seems the system basically consists of three parts:

- Tandem pump ($1497.15)
- Stabilizer bar ($1653.70)
- Valve block (no price @ realoem, but listed locally at around $1700)

Obviously not what I was hoping for. First of all I do not know where to start, second I was expecting it to be possible to replace sensors separately, and third... I am aware that it is a complicated system, but those PRICES...

Being my only car it is also complicated to just start disassembling it not having any parts or solution ready. Anyone know how this system is set up? Is it possible to source these sensors anywhere else? Any help would be greatly appreciated.

Last edited by grr; 10-02-2016 at 06:27 AM.
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  #2  
Old 10-02-2016, 08:09 AM
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There are several reports of these problems being voltage related.
Starting the car puts a huge drain on the battery. This can pull the system voltage down to the point where modules fail their pre-start checks and report errors.
How old is the battery?
Can you check the battery voltage, at the battery, immediately before starting, after sitting for overnight?
I would put a 10 amp charger on the battery overnight and see if the problem goes away if only for a few days.
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  #3  
Old 10-02-2016, 09:09 AM
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I think the pressure is related to pressure from the power steering pump which powers the stabilizer bars. A turkey baster fluid change may be worth the effort. The required type of fluid is stamped on the filler cap. Drain, refill, run, repeat a few times. Do you have Rheingold? It may be able to run some tests based on the codes it sees.

Read the PDF attached to this post.
XBimmers.com | BMW X6 Forum X5 Forum - View Single Post - E70 - Self Level (AirBag) Suspension Components
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  #4  
Old 10-02-2016, 04:54 PM
grr grr is offline
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Sorry for not mentioning, but I tried charging the battery immediately, and also topped up the servo reservoir (already at max), but it didnt make any immediate change. However after a couple of days the fault frequency went down. At the beginning it was there maybe four out of five drives now its more rarely. I started and stopped the car four times today, no faults. Drives fine as well. When the failure shows it is way different to drive, it rolls a lot around the front axle at roundabouts etc, have to watch the speed while cornering. Ehen the faults doesnt show its perfect to drive. Sport mode works as well.

I am not sure about the battery age, I will have a look and see if its marked with a date - or maybe its possible to read when it was coded in.

The servo takes CHF11S fluid. It might be worth a try to replace it. Not sure if its part of any services. Its had all the required services until now (about 60k miles).

I dont have Rheingold, but I have access to INPA, and can ofcourse have a workshop read codes.

Thanks for the pdf link!
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  #5  
Old 10-05-2016, 04:50 PM
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Damnit. Was away on business and my wife called about the X5. Strange noise from the engine. Turned out to be a broken idler pulley bolt! Apparantly theres been a recall on this in the states, four years ago, but as always not in Europe because we cant sue and win billions over a spilled cup of coffee.. not very likely that it has something to do with the dynamic drive issue, unless it broke due to a bad tandem/servo pump. Belt looks fine.
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  #6  
Old 10-06-2016, 12:25 AM
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Quote:
Originally Posted by grr View Post
but as always not in Europe because we cant sue and win billions over a spilled cup of coffee..
Cant help with your issue...but this line got me thinking.

VW is jumping through their a$$holes in the USA with the diesel issues, but slow dragging in the EU...wonder why?

So maybe there are some good things when it comes to lawsuits, and class action lawsuits, in the USA? Some good, some bad. Yes, there are abuses- yes there are attorneys and entire law firms that exist to fleece businesses. But then there are corporations that would 'do the right think' without the threat of litigation. Remove that threat and you have consumers getting abused.

Sure got VWs attention!

(and it wasnt billions, just millions. )
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  #7  
Old 10-06-2016, 04:23 AM
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Here in Norway we actually have quite strong consumer rights, but only to have the original fault repaired, and only within the first two or five years depending on how long a product is expected to work (they actually put mobile phones in the five year category, simpler and cheaper electronics are in the two year category) and we have always considered the rights in Norway as better than in the US, but replacing an idler pulley is nothing for BMW, worth taking a risk for. Normally the customer will be happy enough after having the fault repaired. A major lawsuit in the US where they can lose millions however... VW set aside an insane amount of money for the diesel lawsuits, but I believe they expected to spend 90-95% of it in North America, even though the numbers of affected cars are higher in Europe...
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Old 10-06-2016, 11:02 PM
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Part of the VW diesel problem in Germany is that the government owns a sizable part of VW they also have a say at the board. The government does not want their shares to loose value. Another thing is that the cheat in Europe was much less than in the US. The European diesel emissions standards are much less than here and the fixes were small.
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  #9  
Old 10-23-2016, 05:06 AM
grr grr is offline
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A few years out of the BMW game, so I was kind of outdated in the world of diagnostic tools. Now I got ISTA+ running and it is magical. Seeing that the front axle pressure sensor and the rear axle pressure sensors are calibrated the same. They also have the same voltage. However the front axle sensor is fluctuating from -12 to +110 bars with the engine off, no wonder theres a system failure. Seems new valve block would be the route to go at a dealer. However I found that the sensors seems to be available on eBay, Aliexpress etc for just $25-50. Seems they are commonly used as fuel rail pressure sensors on common rail diesel engines. They have the same part number, but there is a different number on the steel part of the sensor, so this is not confirmed information. I have already bought a new valve block, and I am still considering if I am going to replace it completely or try to order a new sensor.

Seems like a DIY job for anyone with proper diagnostic tools and a little bit of mechanical knowledge. Valve block have to be calibrated after replacing or changing anything on the system, but there's a procedure for that.

Main problem right now is that I dont have time to work on the car, working away in the weeks etc., so still considering letting the dealer handle this, but it would be a good feeling to conquer this one my self...
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  #10  
Old 10-23-2016, 03:57 PM
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Great info. Can you post a few photo's of the sensor showing the part number(s?
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