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Old Jun 14th, 2014, 03:17 PM
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DIY ECU fault

Looking for some advice.
My friend has a 56 plate Mini Cooper.
When driving the ECU light is coming on and power drops.
Showing DTC light also, problem is still there when you switch DTC off.
Switching off engine resets the problem, but recurring every 5 miles or so.
It has been into BMW dealership for diagnostics and showing no faults.
They have replace throttle housing, battery then they said it was £1500 for ECU. Just fitted one from ECU doctor and fault is still there.
Becoming tedious and expensive giving it to BMW for trial and error problem solving.
Any suggestions?
Thanks in advance
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Old Jun 15th, 2014, 01:03 PM
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The problem with buying a ecu from ecu doctor is that there not an 100% that it's going to be perfect and I would recommend to bmw and getting them to put an ecu in it and see if that fixes it and if it dunst then they will give you a really good deal in your ecu seeing it was them who told you it was faulty.

That is the only step forward i could see from here.
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Old Jun 15th, 2014, 02:03 PM
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Quote: Originally Posted by Fredbex (original)
Looking for some advice.
My friend has a 56 plate Mini Cooper.
When driving the ECU light is coming on and power drops.
Showing DTC light also, problem is still there when you switch DTC off.
Switching off engine resets the problem, but recurring every 5 miles or so.
It has been into BMW dealership for diagnostics and showing no faults.
They have replace throttle housing, battery then they said it was £1500 for ECU. Just fitted one from ECU doctor and fault is still there.
Becoming tedious and expensive giving it to BMW for trial and error problem solving.
Any suggestions?
Thanks in advance

Hi ya

What generation is it 56 plate could be gen 1 or 2

If it's a gen 1 (r50) have a good look around the wiring from the ECM and around and under the battery box, fuse box and also around the abs pump.
Another place to look also is around the rh engine mount and casting these are known places for damaged wires
If you have had work carried out previous to your problem look around there first

If you ever have a problem with any of the electronic stuff on your mini Give these guys a ring there top notch they should be able to help you

BBA reman online catalogue

Hope this helps
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Old Jun 15th, 2014, 07:04 PM
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Thanks gentlemen,
Given the amount of time it has spent with BMW I would hope they would have checked wiring thoroughly. Will get it back to BMW and get them to try ECU.
However, ECU doctor sent a second hand ECU programmed to the car and it would be unusual that a second ECU had exactly the same fault?
Might just need to bite the bullet and trade it in.
My partner lives in the country and too dangerous to have the car podding along at 5 mph till problem clears.
Appreciate your speedy response,
Fred
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