E70 X5 Ignition fine but wont start - intermittent

[Alex Craven]

Hi,
A couple of garages have looked but cant come up with an answer. Replacement battery makes no difference.

The steering wheel never locks, is this usual? I was wondering if this is an immobilisation feature gone wrong?

When it wont start, it wont start for hours or days, and then it just does... weather does not seem the issue.

A few fault codes;
A735 - junction box electronics (e9x) activation servotronic valve (e7x) activation eco valve.
C947 - advanced safety crash management bus communication system.
54c6 - VTG oil wear.
A670 - fzd signal line fogging sensor.

It recently started stalling on occasion, so I had throttle actuator changed (didn't help) then 3 injectors which did the trick.

Any ideas would be much appreciated.

[Jakg]

(not a mechanic)

Seems like you don't have much information, despite having more than one garage diagnose? Are they specialists, do they know what they are doing?

Does it turn over but fail to start? If so, fuel pressure etc
Does it fail to turn over? If so starter, immobiliser etc

[Alex Craven]

Hi, thanks...
It does fail to turn over, no one seems to think it is starter motor, I am suspectiong an immobilise issue however with it being an intermitent fault, it seems odd.

[Alex Craven]

Hi, thanks...
It does fail to turn over, no one seems to think it is starter motor, I am suspectiong an immobilise issue however with it being an intermitent fault, it seems odd.

[njw1]

It sounds like it could be a bad earth or a problem with the battery positive cable, the 5 series was recalled for this issue, I'm not sure if the X5 was?