ECUconnection

Mark Welch ★★★★★ a week ago
Quick turn around of my data wipe on a crash ECU. Got a detailed log of all fault codes before and after the clearance and … More a highlight of what was cleared.
Fast delivery back to me as well.
Owen Farrell ★★★★★ a week ago
Excellent service , super helpful and the job was done and returned to me in 2 days . Would recommend this service to anyone … More who is sick of banging the dash to get the car started 🤬 Don't try it yourself for the sake of £70 !!
Debbie Flynn ★★★★★ a month ago
Flawless service. Normally when you contact a company for advice they either switch off or are vague at best. Not the case … More here, I had called for advice on a client's FIAT Ducato Motorhome, the technician was all too happy to help, talked through potential causes and solutions. I packaged off the vehicle ECU and had it back in under a week. Will 100% use you again and recommend to others. 10/10!
Declan O'Dea ★★★★★ a month ago
ECU were fantastic throughout and were able to clone my Ducato immobiliser into a 'doner' unit I sourced myself … More in Poland. The whole process took just a couple of days once they received the unit and they were able to test it with the key I provided. All in all a great service and value for money.
James Andy Palmer ★★★★★ 2 months ago
I was initially quoted £800 for a replacement ECU unit or £450 for a repair and fit. I was then referred to ECU Connection … More and given the owner’s contact details. To put it simply, they sorted out all my issues with ease. Thanks to their professional service, my wife is back on the road in the Merc, and life is so much better.
Great job, very professional, and a positive outcome all around. Thank you so much to the team at ECU Connection!
Jason Marks ★★★★★ 3 months ago
Used this company having come across them on YouTube (where they were fixing a car with the exact same issues ours was facing). … More My very basic home diagnostic machine wasn’t picking up the error codes, but a quick call to the company put my mind at ease that it was the airbag ecu causing the issue. They advised they would bench test it with their equipment, fix and return. My local garage was sceptical (they assume a new unit for £400-£600), but these guys and gals worked their magic and I reinstalled the original unit a week after being removed (thanks Fiat for making those bolts so easy to reach 😬).
The car immediately recognised the ecu brain, all errors had gone and the car is back to normal (I didn’t need to reprogram the ecu to the car luckily).
Would therefore recommend the company to anyone with this ecu airbag issue. Great service.
Toon Viaene ★★★★★ 2 months ago
Very satisfied with the repair of a defective ECU of a Peugeot Partner. Very helpful and professional people. Search for … More a solution in consultation with the customer. Good follow-up and fast communication. The ECU was repaired quickly and returned carefully packaged. Thanks for the good service. Recommended!
Matthew Storey ★★★★★ 3 months ago
Had my Ford Focus non start issues diagnosed as a faulty instrument cluster. Sent my cluster unit off for refurbishment after … More coming across a YouTube video. Returned back within 3 days. All working again. Fantastic service A+
Lorraine Anderson ★★★★★ 3 months ago
Amazingly prompt service! Got my fiat airbag module repaired within 2 days for a very good price as I had been worried that … More i needed to buy a new one which is 3 times as much. Thankyou for saving my little car and my pocket! I will definitely be recommending you to everyone i can
andy hatley ★★★★★ 3 months ago
Justin is the man , otherwise my motorhome was useless rewrote ecu and immobiliser reloaded both keys and made them all work … More , refitted to van and fixed , Do Not Hesitate to use these people Fantastic. Many Many Thanks Fiat Ducato 2.8
Leo L ★★★★★ 4 months ago
Sent my Ford Focus cluster unit off for refurbishment - was returned within 3 days and now works perfectly.
Fantastic service! … More
Huge Bacchanal ★★★★★ 5 months ago
The airbag module in my Fiat 500 had stopped working (flashing lights all over the dashboard...); diagnosed the issue via … More YouTube, and sent the module away to ECUconnection who sorted the issue quickly and returned the unit faster the expected. All appears to be working very happily now... :)
Harry Ackle ★★★★★ 5 months ago
Very happy with the service, well done guys. Got an email to confirm when they had received my faulty cluster, also another … More email once repaired and sent back to me. Sent and received back within a couple of days. Also fixed my non running car, so couldn’t be happier.
Paul Rogers ★★★★★ 5 months ago
Sent instrument cluster for repair, very easy to arrange with great communication and fast turn around time for repair. Would … More gladly recommend and use again. Thank you.
martin Mangik ★★★★★ 5 months ago
They received my ECU plus a donor ECU for cloning on a Monday, the next day they couriered both ECU 's back to myself … More which i received on the Wednesday and everything worked brilliantly. 10/10 highly recommend, thank you guys .

Plug & Play

Immo Off Unit

VW Polo 1.2 ECU Siemens 03D906023B | 5WP40421 | Simos9.1 | Plug+Play Immo off ‘Free running’

Name: VW Polo 1.2 ECU Siemens 03D906023B | 5WP40421 | Simos9.1 | Plug+Play Immo off 'Free running'
SKU: ECU-2125
Availability: OutOfStock

£120.83 +VAT

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SKU: ECU-2125 Categories: Volkswagen, ECU SHOP, Engine Control Unit, Siemens Tags: Immobiliser Off, Plug and Play

VW Polo 1.2 ECU 03D906023B | Siemens 5WP40421 | Simos9.1 | Plug+Play Immo off ‘Free running’

Removed from running vehicle and dry stored - Good working order

This ECU has been re-programmed to being 'Immo off' (Immobilizer removed / free running) and will work when it is fitted & plugged in to your car with no further programming of keys etc necessary - it will start & run as normal even if there is no transponder chip fitted inside the key (Plug & play). If you would prefer you immobilizer data programmed to this ecu or for any reason it will not work you can send it back with your original unit for bench programming (Data transfer) at no extra cost!
We also offer a separate 'Immobilizer delete service' for this type of ECU - For example if you have already sourced a replacement unit for your vehicle & are looking for a way to program it to your vehicle then we have the solution! For more information about the services we offer on this type of ECU please click on the 'You may also like' link above.
Also available is a vast array of other programming & refurbishing services such as Immobilizer PIN code reading, Tech2 resetting, ECU cloning, Immobilizer deletes and much more on all makes of vehicles and all kinds of electronic units such as Airbag ECUs, Instrument clusters, Body control modules, PAS units etc etc! For more details about our programming & repair services click on the 'Services' link at the top of the page & use the filters on the left of the page to find what we can do for you. If you cannot find the service you need then contact us to see if we have the solution to your cars electronic problem.

Important! – Please read! - It is essential before ordering an item that the part number of the item you are ordering matches the part number EXACTLY of the component on your car that you need to replace. Also ensure that the fault with your car is an ECU fault and your problem has not been misdiagnosed. We strongly recommend having your car diagnosed by a competent Auto-electrician or specialist garage before ordering. If we supply a faulty ECU we are happy to provide a replacement or fully refund you if a replacement is unavailable, however if your existing problem persists with your car then the fault has most probably been misdiagnosed – if you request a refund on this basis then a 20% restocking fee will be deducted from your refund & return postage will be at purchasers expense.

Weight	2 kg
Type	Engine Control Unit
Manufacturer Part Number	5WP40421
Reference OE/OEM Number	03D906023B
Brand	Siemens
Car Make	Volkswagen

Scan the vehicle with a diagnostic scanner

1 . Scan the vehicle with a diagnostic scanner & record fault codes – rectify any faults recorded here first & check the wiring for faults

If your ECU has ‘No communication’

2 – If your ECU has ‘No communication’ with a diagnostic scanner it is essential that you check relevant fuses and consult a wiring diagram for your vehicle and verify the power supply & test the wiring to your ECU – particularly test power supply relays (Engine control relay). – ECU’s returned due to misdiagnosis are subject to a 20% restocking charge

If you are not a qualified auto electrician

If you are not a qualified / experienced auto electrician or garage technician and you are unsure if the problem with your car is the ECU then please consult one first before ordering – there is a 20% restocking charge for returns due to misdiagnosis

If your fault is a cylinder misfire

If your fault is a cylinder misfire please check spark plugs / leads / coil / injectors and wiring faults / headgasket faults etc before ordering, if these have been checked or replaced then it is important to check inlet manifolds for leaks, engine compression & perform a vacuum gauge test to check for valve problems.

VW Polo 1.2 ECU Siemens 03D906023B | 5WP40421 | Simos9.1 | Plug+Play Immo off ‘Free running’

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