[drpaul87]

Saw the eCM issue coming before it became a problem. Changed the unit. Drives fine, shifts excellent. Only problem...after about a week, got it up to highway speed and the P0420 and 0430 codes came out. I know they had a flash programming for it (I have the sticker under my hood that it was performed). They werent an issue with the original ECU, but now are. Any thoughts? Any permanent fixes besides replacing the cats?

 

[aetius757]

I used a cheap OBDII reader to reset them for over a year but finally got tired of always checking them and had the cats replaced. Before that Toyota told me to take it on the autobahn and run it to 180kmh for 10 minutes or so. That did the trick for a year, but then they came back again.


I did see a y-tube video where some mechanic took out the cats and washed them in soap and water, he said it fixed them with no more codes. Not sure if or how long it would work though...

 

[lunchindabox]

Your "new" ECU doesn't sound like it's been flashed, I'd start there.
Cats are expensive.

 

[Mach III]

Have you tried this?
http://www.rav4world.com/forums/88-...on-dreaded-p0420-p0430-codes.html#post1947169