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Old 16-02-19, 08:16 AM   #1
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Default 806 ECU replacement

Hi guys!

Am a new member on this forum, and am hoping that the wealth of knowledge and resourcefulness from other members can help with my enquiry and get my car going again.

I have a 2001 806 auto with the 2ltr 16v petrol engine. The car wonít start and has been diagnosed as having a waterlogged ECU. Iím no auto electrician but reading other threads it seems that, if the ECU is beyond repair through water damage, I need to source a replacement and then get it cloned/coded/synched - whatever the correct term is - to my vehicle. Having scoured the internet, I canít find a new ECU (and guess that, if I did, it would be more expensive than the carís worth!) but I can find one second-hand on eBay for £100 that has the correct Bosch/Peugeot part numbers: 9632564780/0261204702. A couple of questions:

Is this the right way to go, or are there any specialist breakers in the U.K. who Iíd be best trying to source one from?

With the right software, would this then be a relatively straightforward process for an auto electrician to Ďmarryí the replacement ECU to the existing system on the car?

Am I missing anything, or are any other parts required to fix this issue?

Thanks in advance for any pointers or advice on this 👍🙂
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Old 19-02-19, 05:07 PM   #2
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Not sure on how easy it would be to get the replacement ecu to work. Which ecu are we talking about? The engine fusebox on the 807 wasn't coded but the engine ecu is.
Are you sure of the disgnosis? Generally it is the wiring that suffers damage from water on plugs etc or breaks due to too much tension, ecu's rarely fail.
If you are sure of the diagnosis what about sending it away for repair (though 60% of the time they are reported as being fine by the specialist for the reasons just stated), at least you will get a guarantee and there won't be any programming issues.
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Old 19-02-19, 06:46 PM   #3
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The easiest route is to buy an ECU/BSI/key kit. You then swap out the BSI and ECU and replace the chip in your key with the new one. You can do this yourself. This assuming your ecu IS waterlogged/fubar. If it is, you may also have wiring damage so you would be advised to check the wiring/plug for damage. It may also only be wiring damage as wynb suggests as the ecu is normally quite watertight.

You may then need to get someone with PP2000 reprogram the BSI if the car you get the replacement from has a different trim spec to yours, but the car will run regardless.

Be aware that the mileage on your cluster may change if the new BSI/ECU has a higher mileage stored on it, it will then match the higher mileage from the replacement kit.

If you need reprogramming, check for someone near you on the PP2000 map HERE.
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Old 20-02-19, 04:03 PM   #4
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you can remove immobilizer from 2nd ECU and ready to go


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Old 20-02-19, 05:38 PM   #5
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Default Merci Beaucoup!

Given that we're talking Peugeots, I thought that a French title to my reply would be appropriate!

Firstly, thanks SO much to you all for taking the time to consider my 806's issue, and then provide such useful advice...means a lot to a newbie fumbling around! In my OP I should have stated that it is the main ECU that's not currently functioning - the one situated under the bonnet at the furthest point on the driver's side/offside.

I'm interested to read that two of you are querying whether or not the ECU is even at fault at all, and that the water ingress may have wreaked more havoc on the wiring than on the ECU itself. I have got some pictures (which I'll try to upload to this post if size permits)of the damaged parts whereby you can see where (as always!) water and electricity haven't mixed well, resulting in a bit of a mess. As the ECU may still be serviceable after all, and given that the job is above my pay grade, I've asked a reputable, local (Somerset) auto electrician to take a look for me, at least to advise me on the damage and prevent buying any parts that may turn out to be unnecessary. Any suggestions on where best to source any second-hand parts in the UK would be much appreciated.

Again, thank you all for your support and advice.
Attached Thumbnails
806pic1.jpg   806pic2.jpg   806pic3.jpg   806pic4.jpg  
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Old 21-02-19, 06:33 PM   #6
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Looking at your pics, you should be able to clean the ecu pins successfully. The plugs will be a lot more difficult as the corrosion will be inside the female pins [I have had issues with corroded female plugs before and attempts to fix were futile]. I would suggest the best way to do the plugs would be to source corrosion-free ones from a wrecker and cut/solder those in.

Of course you would need to check that water has not got into the ecu itself and damaged the circuits. But I would replace the plugs first, plug in the ecu after cleaning the ecu pins up and see if it all works before you attempt to open the ecu [as they are normally pretty water resistant].
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Old 21-02-19, 07:06 PM   #7
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Hi WillNZ

Yet again, grateful thanks for some sound advice, which I really appreciate. In fact, I'd been thinking along the same lines and have been ringing around to try and locate the same vehicle in a breaker's yard to lift the female plugs from, but to no avail yet...these cars are dwindling in numbers!

Incidentally, and on that theme - and I know you're in New Zealand, so this might be of limited interest to you - other readers may not know that there's a great website that takes DVLA data and provides the numbers of specific vehicles/models that remain, either licensed to be on the road or SORNed. The address for that is https://www.howmanyleft.co.uk/

Thanks again for the help, WillNZ...I hope that this story will have a happy ending!
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Old 21-02-19, 08:50 PM   #8
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You dont have to specifically look for an 806, just look for any model peugeot fitted with the same motor from that era [2001ish], they will likely all use the same ecu and plugs will match.

Just check that each new plug has the wires in the same places as yours before fitting. The female connectors inside the plastic housing can also be removed/relocated using the correct extraction tool, these tools are normally quite readily available or you can make your own, so is simple to match new plugs to yours if there happen to be differences in wiring.
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Old 19-03-19, 10:58 PM   #9
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Thumbs up Allís well that ends well!

Hi guys!

After all the sound advice and guidance that this forum provided, I thought that it would only be fair to report back on how my 806ís engine came back to life.

The water-damaged ECU went off to a reputable specialist, who confirmed that it needed replacement circuitry. It was then fitted on the car, plugged into the cleaned up female pins...and it didnít start! In the end, my guy had a hunch that the problem still laid with the ECU. So back it went to the repair shop where a small but critical glitch was found to be still present. In fairness to the service level of the repairer, the company issued me with a complete replacement ECU at no additional cost to me. Well impressed with that! This was then refitted...and the car burst into life, and cleared its fault codes! Itís running like a dream now.

Great to have a forum knowledge-base like this to be able to draw upon for support...cheers guys
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Old 20-03-19, 10:33 AM   #10
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You now need to look closely at where the water came from to avoid the same issue later it can creep up the wires from temp senders etc unless you know where it came from.
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