Q: ECU Compatibility

asked by on

My RAV4 contains a damaged ECU with the reference 89661-42D70 , but I didn't find another one with the same reference, some sites specialist in toyota parts like toyodiy.com says that I can use another one compatible with my car with different reference 89661-42D40 ( the difference is in the last two chiffres ) , can I do that ?

My car has 280000 miles.
My car has an automatic transmission.

The part number for the 3.5L 6-cylinder engine is 8966142G02 and the number for the 4-cylinder engine is 8966142F72. As long as the ECU you’re getting matches or cross references the appropriate part number, there shouldn’t be a problem. However, you can’t simply plug the new ECU in and go. It must be programmed with an OEM capable scan tool in order to operate properly. A professional, with the proper equipment can both install the proper ECU and program it for you. It might also be a good idea to get the vehicle diagnosed by an expert to confirm the ECU is the problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. ECU Compatibility

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I release the steering wheel lock?

Your car features a steering lock system that prevents the steering wheel from being turned under certain conditions. For instance, if the ignition is off and the electronic key is not nearby, the wheel cannot be turned. This is a...

Q: Plug leaking fluid

Coolant expansion plugs can leak in two different ways, they either corrode through or the surface between the plug and the block/head surface develops a leak. In either case, however, the plugs cannot be re-used. The coolant expansion plugs must...

Q: Weird electrical problem

Hello, thank you for writing in. The electrical circuits that relate to both of these systems are crossing at some point. This may be an issue with the body control module, the fuse box, the bulbs, or the electrical wiring....

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.