Leaderboard

Yes you can revert back to stock if you "mess up" assuming you don't mess up by bricking the ECU such as interrupting the flash process, etc. There is more to it than *just* eliminating the P0420 code. First of all you CANNOT remove the rear O2 sensor - just get that out of your head completely if you figured on it. The ECU will not go ready and there's no way to make it do so if the rear O2 is bad or missing. Second - there is a table for post-cat fuel trim that you need to zero out - if you don't - some years of cars allow the post-cat trim to add or subtract as much as 50% to the primary fueling - a bad sensor can therefore still make the car essentially undrivable under the right conditions. We really don't understand this design choice since the combined long and short term primary wideband fuel trims aren't even this high. It's weird to say the least but such is life when you start messing with factory calibrations - at least it's not a Ford with Torque Modeling and 40 or 50 fueling tables. GD

I'm drooling all over that digi dash! never have had the opportunity to see a working one yet, always makes me smile when I see one.

yeah, BRICK, is the word that made me anxious about the process. In fact, I had my laptop plugged in to it's charger and ext. cord when I flashed my ECU.