Denso · petrol · 2001–2020
Toyota ECU 89661-42 xxx — RAV4 engine ECU
RAV4 through the XA40: 89661-42Q34 (2009–2011), 42K50 (2013–2014 2.5), 42Z20 (2019–2020 2.5).
Models fitted with 89661-42
RAV4
XA20 / XA30 / XA40 · 2001–2018
- 2.0 / 2.4 / 2.5 4-cyl · 1AZ-FE, 2AZ-FE, 2AR-FE
- 3.5 V6 (2006–2012) · 2GR-FE
RAV4 / RAV4 Hybrid / Prime
XA50 (TNGA) · 2019–2026
- 2.5 4-cyl · A25A-FKS
Prefix-to-application pairing checked against published parts data on 2026-10-14.
Clone the 89661-42 ECU — $350 flat
Mail your original and a donor with the same full part number. VIN, immobilizer data, coding and adaptations are copied across on the bench, typically within 24 hours of arrival. Factory immobilizer stays on.
Toyota / Lexus / Scion engine ECU cloneOn-car software step — remote Techstream, $250
Some cars still want an on-car step after a module swap — an ECU communication ID registration on a smart-key car, a calibration update, or a key registration. Plug a J2534 pass-thru interface into the car and we run the factory Techstream software on it from our bench — no dealer visit. The same session covers programming after any other Toyota or Lexus module replacement.
Book the Toyota / Lexus remote sessionFrequently asked questions
What is Toyota ECU part number 89661-42?
89661-42 is the model code of a Toyota / Lexus / Scion engine control unit in the RAV4 engine ECU family (Denso), common on 2001–2020 petrol cars. RAV4 through the XA40: 89661-42Q34 (2009–2011), 42K50 (2013–2014 2.5), 42Z20 (2019–2020 2.5). The rest of the number selects the exact calibration.
Which models use a 89661-42 ECU?
In the US: RAV4 XA20 / XA30 / XA40 (2001–2018); RAV4 / RAV4 Hybrid / Prime XA50 (TNGA) (2019–2026). Always confirm with the label — the same model year can carry a different family on another engine or build.
Can you clone a 89661-42 ECU?
Yes. Mail your original 89661-42 unit and a donor with the same full part number and we copy your VIN, immobilizer data, coding and adaptations onto the donor for $350 flat, typically within 24 hours of arrival, immobilizer intact. If the car then asks for an on-car step, the remote Techstream session over J2534 is $250.