Garage misdiagnosed fault - what would you do?

Garage misdiagnosed fault - what would you do?

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L33

Original Poster:

3,468 posts

224 months

Sunday 13th January 2013
quotequote all
My MK5 Golf went to an independant VW specialists in Birmingham a couple of weeks ago. The reason for taking the car in was that it was turning over but not starting.

The canbus system on the car was intermittently dropping in and out but I managed to get a full list of the faults that the car was throwing up using a VW fault code reader I have and passed this onto the garage as a head start for them.

A couple of days later, the garage call me to say that they suspect main ECU was the problem and to keep costs down could send it away for test and subsequent repair if necessary. I questioned this first off as the ECU has little input on the cars canbus system which was evidently where the fault was. As they are the specialists, I took their word and agreed.
The ECU came back a week later. It was confirmed by the testers as not working correctly and they repaired it. The garage refitted the ECU and still no joy. Same issue as before - the car turns over but does not start. They dug a little further and found the gateway car to the canbus system had failed (severe water ingress had caused the card to literally discintegrate). A new card was fitted and the car is now fine.

Now onto my issue. I'm due to collect the car on Monday and the final bill is expected to be in the region of £1000. I have no issue with the gateway card and a few hours labour - about the half the bill. What I object to is an ECU repair that I don't think was necessary and certainly didn't cure the fault.
Do I pay the full bill and be happy or dispute the circa £500 ECU repair that didn't cure the fault? My grounds for dispute would be that if the garage was competant then they would have found the canbus gateway card was at fault before deciding to send the ECU away for testing?

Any advise would be much appreciated.

Many thanks in advance.
L33

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DKS

1,675 posts

184 months

Sunday 13th January 2013
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I would certainly take issue with the company that claimed to fix the non-broken ECU.

Rarefied Brains

847 posts

205 months

Sunday 13th January 2013
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How do you know that a short in the card didn't blow something in the ECU I/F ?

Hitch78

6,106 posts

194 months

Sunday 13th January 2013
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Bit of a kick in the balls but...

L33 said:
I took their word and agreed.

Deerfoot

4,902 posts

184 months

Sunday 13th January 2013
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What did the repairers of the ECU say was wrong with the ECU?

Did they actually fix anything?

TROOPER88

1,767 posts

179 months

Sunday 13th January 2013
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How can you be sure that they do actually intend to charge you for the ecu work?

TooLateForAName

4,747 posts

184 months

Sunday 13th January 2013
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ask for the test report on the ecu.

If they cant't provide then dispute.

L33

Original Poster:

3,468 posts

224 months

Sunday 13th January 2013
quotequote all
Thanks for the prompt replies guys - some very valid points. The knackered gateway card could have blown something in the ECU, I did indeed agree to them sending off the ECU for repair. I think the repair report for the ECU will be crutial (if it exists) in taking this further.
If anyone else has any ideas, please feel free.

Cheers,
L33 thumbup

Devil2575

13,400 posts

188 months

Sunday 13th January 2013
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You only have a case to dispute the bill if there was nothing actually wrong with the ECU. It seems plausible to me that the ECU was damaged when the other part failed., but i'm no expert.

DKS

1,675 posts

184 months

Sunday 13th January 2013
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It's more an issue of the ECU company saying they've repaired something.

Velnshell

1 posts

79 months

Monday 23rd August 2021
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Hi
I’ve got a similar issue advice required . My car is still at bmw garage since 2weeks this Thursday.. it went in with an issue while idol and start up l. Driving not a problem. They came back and said it’s the injectors at £2000 we agreed so they changed them only to find the fault still there said it runs well now though but it it always did. They have checked cylinders changed spark plugs twice, checked new injectors incase one faulty still not resolved. They have now called in a specialist as they are stumped.. they still will want paying £2k why!! Even if they find the fault and sort it wot about the Injectors…so stressed with this.5 series 05 plate

Decky_Q

1,512 posts

177 months

Monday 23rd August 2021
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Sorry but you have made a huge mistake taking your nearly 20 year old car to a bmw dealer. They will bill you for the work so far, that's kinda tough as you instructed them essentially to do this.

Get it out of there as soon as possible, investigations into a car of that age could run into eye watering bills. Get a report on what they have done so far and put it into a local specialist to finish off.

That would be my way of proceeding in this situation.

Decky_Q

1,512 posts

177 months

Monday 23rd August 2021
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Also for bad idle try changing your MAF (air flow sensor) it's easy to do, a pattern part will be £20-50 and most can be changed with just a screwdriver.

Good luck.