P0157 + Performance Headers Troubleshoot

First time Toyota owner here, so a whole new world for me (coming from GM). Please let me know if this post needs to be moved or is against the rules.

I bought a used 2020 Platinum that the previous owner already did significant work to. That work includes performance headers, Borla exhaust (true duals), lift, wheels, and tires.

Upon purchasing the vehicle, I received a P0420 code within 24 hours of driving off the lot with the truck. I've dealt with this code before on an older GM with performance exhaust. I purchased and installed catalytic spacers, similar to the ones found here: https://bit.ly/3mMuMMU . That cleared the code right away, as the imbalance in readings no longer appeared. This is a simple bolt-on application and can be easily removed.

A few days later the CEL came on, and a P0157 code (Bank 2/Sensor 2) followed. The wiring appears to be fine, the harness doesn't appear to be damaged and I wasn't receiving this P0157 previously, which leads me to believe the sensor might be bad, though I have not popped a multimeter on the wiring, yet.

All of this to ask two questions:

1. Am I on the right track with my diagnosis?
2. Assuming the sensor is NOT bad, is there a work-around for this? Is there such thing as a tuning chip/OBD plug to account for the performance headers and exhaust?

The truck drives great and I can't see/hear/feel any performance issues, just the annoying CEL and not being able to use cruise control!

 

Welcome.

Give keith at dirty deeds a call, he's the go-to for exhaust questions.
http://dirtydeedsindustries.com/

 

Thanks!!

 

Probably need DAP Tuning to turn of the light.

 

Thank you - I'd assume it's these guys that you're referring to.

Looks like they have remote tuning options - which is awesome, as I'm on the East Coast.

 

Exhaust leak some where...

 

Yeah - I saw that as a possible trigger, too. My thoughts were it's header related, but I could be off base. Unfortunately, my local shop can't get me in for a smoke test for two weeks, but I do plan on doing that prior to ordering new sensors or doing a tune. Hopefully, that would be the most cost-effective repair if it's minor.

 

20Tun Congrats on the new truck and Welcome
you can prob have another set of hands cover the tailpipes with shop rags to find exh leaks if there are any "faint/slight" leaks they will announce themselves

 

Yes those people. Definitely give Keith a call like stated above he’s big brain.

 

What kind of headers? what cats did they use?

I have stainless works long tubes, when using the cats they provided, I could never totally get rid of the codes and I've used at least 4 different variation of spacers, from simple 1" spacer to 90 spacers with drilled "grille" inserts in between, I was tired of keep playing with them so I had custom mid pipes made with OEM cats, if you have headers and it's leaking, you will hear it on these trucks.