E85 Electric Power Steering Failure - Control Unit

Rits83 · Post by **Rits83** » Fri Dec 08, 2017 1:00 am

Hi Guys

Went to jump in the Z4 on the weekend and the EPS light was on and the sport button was inoperable and I had no power steering. After taking it to my local BMW specialist they have diagnosed that the control unit on the EPS has failed. Has anyone else had this issue? Be keen to read about how you resolved it. I've been quoted around £2,400 for a brand new part from BMW which is out of the question.

Has anyone used these guys?

http://www.ecutesting.com/catalogue/bmw ... &model=658

Seems like a good solution as they offer an unlimited mileage warranty on the rebuilt part.

Thanks in advance

Z43.0Si · Post by **Z43.0Si** » Fri Dec 08, 2017 1:03 am

I’ve used them for an abs module repair. Excellent service, I would highly recommend

Anmarube · Post by **Anmarube** » Fri Dec 08, 2017 7:31 am

I've used them for a Vauxhall ECU.
Tested it and told us it could be repaired. Think it was about £160.
Sent it back next day. Perfect. Saved us a lot of money.
Recommend.

Russell

markplant · Post by **markplant** » Fri Dec 08, 2017 9:00 am

ECU testing are highly recommend

Machine monkey · Post by **Machine monkey** » Fri Dec 08, 2017 10:10 am

If you fairly handy with tools just swap to a hydraulic set up. Ditch the electric steering its rubbish anyway.

LordOxygen · Post by **LordOxygen** » Fri Dec 08, 2017 10:27 am

Machine monkey wrote: ↑Fri Dec 08, 2017 10:10 am If you fairly handy with tools just swap to a hydraulic set up. Ditch the electric steering its rubbish anyway.

What's the approx cost assuming DIY labour to do the job?

raymond.harper · Post by **raymond.harper** » Fri Dec 08, 2017 11:03 am

viewtopic.php?f=2&t=92858 the intermediate shaft is the most costly part

Machine monkey · Post by **Machine monkey** » Fri Dec 08, 2017 12:42 pm

LordOxygen wrote: ↑Fri Dec 08, 2017 10:27 am
Machine monkey wrote: ↑Fri Dec 08, 2017 10:10 am If you fairly handy with tools just swap to a hydraulic set up. Ditch the electric steering its rubbish anyway.
What's the approx cost assuming DIY labour to do the job?

Think mine came in really cheap around a few hundred quid. But i brought all second hand parts. Reconditioned bits the price goes up. And you may want to buy new lines. And the biggest cost is the M intermediary shaft?

You also want a purple tag rack.

mjennings23 · Post by **mjennings23** » Fri Dec 08, 2017 1:39 pm

I'll throw my hat in here as another hydraulic convert. It's a reasonably simple job on the M54 engined model, which I'm assuming you have due to your sig!

All the parts bar the intermediate shaft come from the E46 3 series, intermediate came from a Z4M as mentioned before.

Total cost for myself was approx. £500 diy I believe, that included reconditioned rack and pump, with the rest second hand. All new bolts etc as required.

I didn't rush at all and took a weekend, no issue at all. Could easily be done in a day if desired.

Magicarcher · Post by **Magicarcher** » Sat Dec 09, 2017 6:41 pm

Machine monkey wrote: ↑Fri Dec 08, 2017 10:10 am If you fairly handy with tools just swap to a hydraulic set up. Ditch the electric steering its rubbish anyway.

When happens with warning lights if the EPS is not connected to the can network? Does the car not keep throwing errors?

Rits83 · Post by **Rits83** » Wed Dec 27, 2017 6:17 pm

Quick Update - Took the car to Forza GB - as expected they diagnosed a EPS Control unit failure. Sent the unit off to ECU Testing who rebuilt the unit with a 4 day turn around time. Unit then re-fitted and EPS is back working. Superb job by Forza GB once again. 15% forum discount applied aswell.

dario · Post by **dario** » Wed Dec 27, 2017 7:43 pm

Rits83 wrote: ↑Wed Dec 27, 2017 6:17 pm Quick Update - Took the car to Forza GB - as expected they diagnosed a EPS Control unit failure. Sent the unit off to ECU Testing who rebuilt the unit with a 4 day turn around time. Unit then re-fitted and EPS is back working. Superb job by Forza GB once again. 15% forum discount applied aswell.

what sort of money was the repair if you don't mind saying?

Rits83 · Post by **Rits83** » Wed Dec 27, 2017 7:59 pm

£370 for ECU Testing and £190 labour @ FORZA GB - inc VAT & Postage etc

dario · Post by **dario** » Wed Dec 27, 2017 9:00 pm

Rits83 wrote: ↑Wed Dec 27, 2017 7:59 pm £370 for ECU Testing and £190 labour @ FORZA GB - inc VAT & Postage etc

considering what the other cost was, it looks like a great idea and good cost.

Wraxall Z4 · Post by **Wraxall Z4** » Wed Oct 21, 2020 12:47 pm

mjennings23,
Hi. I'm thinking of doing the same to my 2003 Z4. Do you have any advice/instructions on how you did the conversion please?
Thanks
Paul

Z4-forum.com

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