BigBadBiologist

So apparently something fried in my ECU. (I got a oxygen sensor circut malfunction code and traced it to the ECU using the Honda tech manual. I opened up the ECU and found a fried MOSFET) I bought a used ECU with the exact same part number but the car will just crank and crank without starting and the green key light flashes telling me that the immobilizer system is kicking in. So is there a way to use the ECU I bought? Can this ECU be flashed to work with my keys or do I have to get keys made to work with this ECU? Or????

BLKFLSH

Something will have to be re-programed. I suggest you bring proof of ownership with you to the dealership.

BigBadBiologist

I'm seriously considering just unsoldering the bad chip and replacing it from the ECU I just bought.

BLKFLSH

Well I just hope you know what you're doing on that one. You could end up with two ECUs that are ruined.

honda4674

see thoughs damn chipd keys i love them but there a pain in the *** lol hope it all works out

Ruskimafia

i had a friend that had honda replace his ecu honda dosnt tell many people aobut that, but i believe it maybe cover under warrenty. i might be wronge

Formula Racing

Here is how you do it

Take your key that fits the ignition to a key cutting place and have it cut on a flat key!

Then tape the other ECUS key to the head facing the opposite way. Unless you perminently changed it, in which case bye.. go to the dealer

BigBadBiologist

Yeah, I don't have a key for the replacement ECU.

YeuEmMaiMai

you have to tow it to the dealer and have them reprogram the ECU to your car's current key. You can replace the MOSFET but unless you are sure that you have fixed the condition that caused it to blow up, you'll just fry the new one.......