Hi all,

I can't get my catalyst DTC to ready for smog after disconnecting the battery. Details: 2006, 58,000 miles, stock cat, Flashpro (has passed smog on this exact tune/hardware before). Never had a code thrown.

Over the course of 1000 miles I've tried: numerous cold starts and warm starts, hold in neutral at 2000 RPM until at least 1/4 warm, stop and go for 10 minutes with periods of coasting in gear, long periods of 55-60 MPH with steady throttle in 5th, endless cruising at 80, a day of track driving, 4 tanks of gas.

I'm at a complete loss. Considering disconnecting the battery and trying again. My tags are expired but I can't smog the car until this thing readies itself.

 

No stored CELs? The car has working front and rear O2 sensors?

 

No CELs, car has working front and rear O2 sensors.

 

return the ECU to stock. I had this exact problem and it worked when i removed the flashpro. I believe hondata did some recent firmware changes which prevents the Catalytic readiness from setting. I set the cat readiness in 10 minutes, with the ECU in stock configuration

 

There is a post under Engine Management somewhere that states everything that you need to do to get it to ready status.
I think it is this one but I am to lazy to read through all the pages https://www.s2ki.com/forums/s2000-en...shpro-1094009/

 

Here's a thread to help you navigate the cluster****ery.
https://www.s2ki.com/forums/s2000-un...codes-1166668/

 

I finally had to update the Flashpro firmware and flash back to stock, then I was able to get the catalyst to ready by driving it around for 45 minutes in a mix of highway, city and canyon. Thank god I was finally able to get it smogged. Thanks everyone for your help.

 

I never attempted to get everything ready without returning FlashPro back to stock, but didn't have any trouble doing it when I flashed back to stock and followed the standard procedure. Good to know that it does need to be put back to stock to clear it though.

 

What's weird is I passed smog two years ago with the exact same old firmware and custom tune that I couldn't get to ready this time. But in that case the battery hadn't been disconnected in a long long time, so perhaps it just takes much longer to ready with a custom tune. Who knows. Anyway, from now on I'll just use the stock tune for smog since that did the trick.