Denso (Toyota / Lexus) Engine ECU – Repair, Cloning, Fitting & Replacement
Assessment fee deducted from an approved repair. Repair is not included in the assessment price.
Feedback from garages and vehicle owners
Supported ECU data transfer, with compatibility checked first.
Denso engine ECU for Toyota and Lexus petrol and D-4D diesel engines. Choose the service you need: we repair your own unit, clone your data to a replacement, fit it at our Mansfield workshop, or supply an exchange unit.
Common faults
- No start – engine cranks but does not fire
- No communication with the ECU on the diagnostic tool
- Engine cuts out or goes into limp mode
- Water ingress or corrosion inside the case
- Immobiliser fault after a used ECU was fitted without data transfer
Fault codes often seen
| Code | Meaning |
|---|---|
| P0601 / P0605 | ECU internal memory (checksum) error |
| P0606 | ECU processor fault |
| P0560 / P0562 | System voltage / supply low |
| U0100 | Lost communication with engine ECU |
A fault code alone does not prove the ECU has failed: supply, earths, wiring and sensors can cause the same codes. Not sure? Send the codes on WhatsApp before ordering.
Which cars use this ECU
| Make | Models |
|---|---|
| Toyota | Yaris, Auris, Corolla, Avensis, RAV4 – petrol and D-4D diesel |
| Lexus | IS, RX and other models with Denso ECUs |
Part numbers usually start 89661-. Exact fit depends on the label – send us a photo of both labels before posting.
Before you send it
- Check battery, supply fuses and ECU earths.
- Read and save all fault codes.
- For cloning, mark the units ORIGINAL and DONOR – the donor must be the same part number.
VEHICLE FITMENT
Compatibility guideVehicle lists are identification guidance, not a fitment guarantee. Send the complete part number and hardware revision for confirmation before ordering. A similar-looking unit is not proof of compatibility.
How the service works
Warranty included
Choose your service
- 12-month warranty on repairs
- Tracked UK return included
- No VAT added
- Written report with every unit
- Not repairable? Refund less the bench test
Shipping & drop-off
Post the unit to our lab in Rainworth, Nottinghamshire, or drop it in by appointment. Pack it in an anti-static bag with the fault codes and your VIN – see packing instructions. Tracked UK return is included in every price; turnaround is confirmed when the unit arrives.
Fitting in Mansfield
Fitting options are done by appointment at our Mansfield workshop: removal, refit, fault code clear, adaptations and road test. Book after ordering on WhatsApp or by email.
Questions
Repair, cloning or replacement – which do I need?
If your unit has a repairable fault, repair keeps your original and needs no programming. If it is damaged but readable, cloning to a matching used unit is usually cheapest. If it cannot be read or repaired, we quote a replacement with your data transferred where possible.
Will the car need coding after the work?
Not after a repair or a successful clone – the immobiliser and coding come from your original data. Some units need adaptations reset after fitting.
Does a fault code prove the unit is faulty?
No. Supply, earths, wiring, sensors and actuators can set the same codes. That is why every unit is tested first and you get a written report.
What if my unit is not faulty?
You pay only the bench test and receive the report to show your garage.
Do you remove immobilisers or emissions equipment?
No.
Not sure of the part number?
Send a photo of the label on WhatsApp or by email before ordering and we confirm the right service.
