About Sinspeed: UK Automotive Electronics Remanufacturing in Epsom, Surrey
Summary Sinspeed is a UK automotive-electronics remanufacturer working on a mail-in basis. You post the failed unit to our workshop in Epsom, Surrey; we diagnose it, repair it at circuit level, test it under simulated driving conditions and post that same unit back to you. Your vehicle never leaves your drive.
This page sets out what we work on, what happens to a module between arriving and being packed for the return post, who does that work, and what the warranty covers.
Your own module, repaired at component level and returned still coded to your car — not swapped for someone else's.- Your module, returnedThere is no exchange scheme and no donor unit — the module that goes back on your car is the one that came off it
- Fixed at component levelFaults are traced to the failed driver, joint or track and repaired there, rather than a working unit being scrapped over one dead part
- Proved before it shipsUnits are run on bespoke in-house Hardware-in-the-Loop platforms under simulated heat, vibration and load before they are packed
What Sinspeed does
We repair the electronic units inside cars. A module is removed from the vehicle and posted to us — an ABS pump or ABS/ESP module, an instrument cluster, an electric power steering column or rack, an immobiliser, a transmission control unit — and it goes on a bench here, is repaired, and is sent back to the person who sent it in. The car stays where it is throughout, on a driveway or with a garage, because only the unit travels.
That is the line between a remanufacturer and a parts factor. A factor's answer to a failed module is a different module: you buy the replacement, and making it agree with your particular car — coding, adaptation, matching keys or mileage — becomes your problem or your garage's. Our answer is the module you already own, repaired. It comes back still configured to the car it was taken out of, which is why most units go straight back on and simply work.
Remanufacturing also means a unit does not go back in the condition it left the factory in. Where a module has a known weak point — a driver stage that runs hot, a joint that heat cycling and vibration eventually crack — that point is reinforced while the unit is open, because a brand-new replacement carries the same design and, in time, the same failure.
- A parts factor's answer
- A different module — and making it agree with your particular car, by coding, adaptation or matching keys and mileage, becomes your problem or your garage's.
- Ours
- The module you already own, repaired. It goes back still configured to the car it came off, which is why most units refit and simply work.
- And reinforced
- A known weak point is strengthened while the unit is open. A brand-new replacement carries the same design and, in time, the same failure.
What we repair
The core lines each have their own section of the site, with the model-specific pages beneath them:
- ABS pumps & modules Bosch 5.7 and 8.0, ATE/Teves Mk60 and Mk70 — pump motor and solenoid driver faults, repaired at board level
- Instrument clusters & dashboards Dead or dim displays, stuck gauges, warning lights that will not clear, no-starts traced to the cluster
- Electric power steering Columns, racks and their control units — heavy steering, assist that drops out, stored EPS faults
- Immobilisers & ignition modules Mercedes EIS/EZS, BMW CAS, ignition switches and electronic steering locks
- Transmission control modules Mechatronic units and gearbox ECUs — the control electronics, not the mechanical internals
- Headlight control modules Xenon ballasts, adaptive (AFS) control units and LED driver modules
- Air-conditioning compressors Compressors and the control electronics that drive them
- ECU remapping & tuning Carried out on the vehicle rather than by post — a service line of its own
Alongside those we work on throttle bodies, and on the clutch and gear actuators that sit with a mechatronic unit. Coverage is not a fixed list: in-house research and development keeps it extending to newer models and electronic systems as they reach the age at which they start to fail.
One boundary is worth stating plainly. ECU remapping and tuning is a Sinspeed service. Repairing a failed engine ECU is not — that is a different trade, and ecu-repairs.com is the independent specialist for it. If you are unsure which of the two you actually need, ask us and we will tell you.
What happens to a unit once it reaches the bench
The sequence is the same whether the unit is an ABS module or a mechatronic unit; what varies is what is found in the middle of it.
- Booking in and inspection
The unit is logged against your vehicle details, the codes you reported and the symptoms you described, then inspected before it is powered at all: water staining, corrosion around the connector, impact damage, and any sign that someone has already been inside it. A previous repair attempt changes how the board has to be handled.
- Diagnosis on the bench
The unit is powered and driven until it reproduces the fault you described. Until that happens we have your description of the problem rather than the problem itself. Faults that appear only warm, only cold, or come and go are chased with heat and cold applied directly to the board.
- Repair at circuit level
The failure is traced to the component responsible — a driver transistor that no longer switches, a cracked joint under a heavy connector, a track eaten through by moisture, a memory device that has lost its contents — and that component is replaced, with the weak point around it reinforced at the same time.
- Programming and calibration
Where the system requires it, the unit is programmed and calibrated with dealer-level diagnostic tools before it leaves. Many units need none of this and come back ready to fit; immobiliser, cluster and headlight work is where it is most often needed, and we say which applies to yours when the repair is quoted.
- Hardware-in-the-Loop testing
The repaired unit is wired into a bespoke in-house rig that stands in for the vehicle — the sensor inputs it expects, the bus traffic it would see, real loads on its outputs — and run under simulated heat, vibration and load. Electronic faults are usually conditional rather than constant, so a unit that passes at room temperature on an idle bench has proved very little.
- Packing and return
The unit is packed and posted back to the address you gave us, with what was done to it recorded against the job.
The order matters more than it looks. Reproducing the fault before touching the board keeps the repair aimed at the actual failure rather than at the most likely-looking component, and testing after programming rather than before it means the unit is proved in the state it will be in when you refit it.
Sinspeed · mail-in repair
Ready to put yours on the bench?Complete the repair form with your vehicle details and any stored fault codes, then post the unit in. It is inspected, diagnosed, repaired at circuit level and tested before it goes back to you.
Mail-in, UK-wide · Repaired and returned, never exchanged · Tested under simulated heat, vibration and load
The workshop and the people in it
Repairs are carried out in a cleanroom-standard, ESD-safe workshop. That is a working requirement rather than a presentation choice: static damage to a semiconductor is often latent, so a board that has taken a static hit can test perfectly, go back on the car and fail weeks later for no reason anyone can see. Antistatic matting, wrist straps and controlled handling are what stop that particular problem being posted out.
The work is done in house by electronic and hydraulic engineers, technicians and diagnostic specialists. The hydraulic side matters because an ABS unit is a brake component as well as a circuit board, and a repair that ignores the hydraulic block is half a repair.
Two capabilities sit behind most of what is possible here. The first is board-level repair — working at component level with rework equipment instead of swapping assemblies. The second is reverse-engineering: manufacturers do not publish schematics for these modules, so where a circuit is undocumented it is mapped from the board itself, stage by stage, until it is clear what each part does and where the design gives out. That mapping is what turns a module nobody offers a repair for into one we can quote on.
Sinspeed has been repairing vehicle electronics since 2007, and the useful part of that is the fault history rather than the number. An engineer who has had the same module apart several hundred times knows which stage gives out first and what the board looks like when it does — which is what turns a unit nobody publishes a schematic for into a mapping job rather than a dead end.
- Electronic and hydraulic engineers, technicians and diagnostic specialists
- Board-level rework rather than assembly swaps
- Reverse-engineering where the manufacturer publishes no schematic
- Cleanroom-standard, ESD-safe handling from booking-in to packing
- Repairing vehicle electronics since 2007
The warranty, and what stands behind it
Lifetime, unlimited-mileage warranty on all remanufactured parts. No mileage ceiling, and no end date on the remanufacturing work.
That cover follows from the method rather than from a marketing position. A unit only leaves after it has been proved under load on the rig, and the weak point that brought it in is reinforced rather than restored to standard, so the failure it arrived with is not sitting there waiting to happen again.
Headlight control modules are the one exception and carry a separate, shorter term, confirmed when your repair is quoted. If a repaired unit ever repeats the fault it came in with, tell us and send it back: it goes on the bench again, with the record of the first repair in front of the engineer.
What the term does not replace is a conversation about what has actually failed. A returned unit is tested against the record of the first repair, because a module can be taken out a second time by something on the car rather than by anything we did to it — a failed sensor, a chafed loom or a poor earth presents almost exactly like a module that has given up again, and posting the module back and forth does not fix any of those. Where that is what the evidence shows, we tell you where the fault really is instead of repairing something that was never broken.
- Term
- Lifetime, unlimited mileage — no mileage ceiling and no end date on the remanufacturing work.
- Covers
- All remanufactured parts.
- One exception
- Headlight control modules carry a separate, shorter term, confirmed when your repair is quoted.
- If it repeats
- Send it back. It goes on the bench again with the record of the first repair in front of the engineer.
Where we are, and how to reach us
The workshop is in Epsom, Surrey — Unit 102 Reaver House, 12 East Street, Epsom, Surrey KT17 1HX. The office is open weekdays, 9am to 5pm.
The service is mail-in and nationwide, and it works the same way wherever you are: everything travels by post or courier in both directions. We do not offer collection, and we do not need to see the vehicle — the unit is the only thing that has to be here. Garages, main dealers and independent workshops send us units alongside private owners, and the model suits a busy workshop for the same reason it suits a driveway: nothing is tying up a ramp while the electronics are dealt with.
If you know which unit has failed, the repair form is the quickest way to start — vehicle details, fault codes, and a line on what the car is doing. If you are not certain, contact us before you remove anything. Our FAQs cover packaging, coding, mileage, warranty and returns in more detail.
- Address
- Unit 102 Reaver House, 12 East Street, Epsom, Surrey KT17 1HX
- Office hours
- Weekdays, 9am to 5pm
- Service area
- Mail-in, UK-wide. Everything travels by post or courier in both directions.
- What we need
- The failed unit only. We do not collect, and we do not need to see the vehicle.
- Start here
- Repair form if you know the unit, contact us if you do not.
Sinspeed · mail-in repair
Tell us what the car is doingSend the fault codes and your vehicle details and we will confirm which unit to send before you take anything apart. If you already know, the repair form is the fastest route in.
Cleanroom-standard, ESD-safe workshop · Circuit-level board repair by in-house engineers · Lifetime, unlimited-mileage warranty on all remanufactured parts