P0420 & P0430 codes at same time with new supersprint cats

[mcfreid]

Ah, I see! Will do some research on coding down the post o2s to change their sensitivity range.

Any good tutorials out there for newbs (this would be my first time coding the ECU)?

[Obioban]

Ah, I see! Will do some research on coding down the post o2s to change their sensitivity range.

Any good tutorials out there for newbs (this would be my first time coding the ECU)?

The binary modification tool can do either.

https://www.ecuworx.co.uk/how-to/using-the-mss5x-binary-modification-tool/

[PSUEng]

Bumping this thread as I'm also experiencing the cat efficiency codes after my catted SSV1 system has been installed, I'd say maybe 100 miles and 20 key cycles afterward. All new O2s and stock tune, so I'm sure next steps are just code them out and not attempt playing the game of adjusting thresholds. I don't have to pass emissions, but would like the car to be able to pass if necessary.

BUT--I also got a "4F" EGT Sensor Code (I'm using an old BavAuto code reader). That sensor is brand new "OE Supplier" from FCP installed in the SS cat location; I never had this code previously with the old sensor or factory exhaust. 4F code came on same time as the cat efficiency codes.

I've searched and searched and maybe I'm missing something but should the EGT just be coded off like the O2s, and just cap the bung to avoid hassle, or is this function critical to other systems? Of course, the sensor could be bad, but I've not data logged anything--what tool(s) do you guys recommend for data logging?

[Arclitgold]

Also interested in the answer to this!

[PSUEng]

Also interested in the answer to this!

In my case, it resolved on its own. I noticed initially a lot of "stuff" resembling some sort of fiber building up on the rear bumper after the exhaust install for a short time. I'm guessing that "stuff" may have been affecting the O2 sensors and eventually passed and burned off the O2s? I dunno, never really looked into it. 7,000 miles have passed since I posted last and shortly thereafter I had an HTE tune (but told Hassan to keep O2s active). Provided he did that, it's functioning fine now.