745i- rear level sensor + control engine fan errors

[Patrick Bateman]

Just got my new diagnostic cable and upon giving the car a going over all I can find between INPA and DIS are the following codes. These are both current as I had cleared them.





I had noticed the xenon lights don't do their short moving sequence when first turned on so figured a sensor may have been dodgy anyway. Is there any way to narrow down the sensor that is causing the headlight issue though? This was easy on my e39 M5 aas there was only one on each axle but there appears to be a few here on the rear alone-

RealOEM.com - Online BMW Parts Catalog

RealOEM.com - Online BMW Parts Catalog

Not sure where to start with the engine fan.

[helix402]

The main engine cooling fans do fail regularly on these. I don’t know if your code relates to it or not. The best way to test it is to activate it via diagnosis software. I use ISTA D to activate them.

They are fairly simple to test without software. Three wires in the plug, pos, neg and DME/DDE signal wire. This one needs testing with a multimeter.

But as your last owner says. It may be the e box fan.

[helix402]

I see you have DIS, you can activate the main engine cooling fan with that.

[Patrick Bateman]

Any pointers on how?

It's been a long time since I've used it until today and even then it was only ever for finding fault codes.

See with the sensor for the headlight, is it best to stick to BMW or are aftermarket ones such as Febi Bilstein perfectly decent?

Edited by Patrick Bateman on Thursday 28th December 23:18

[helix402]

This should help with DIS:

http://www.meeknet.co.uk/E38/Pdf/dis_troubleshooti...

Re the sensor, a quality aftermarket one should be fine.