cuongiee

Hi CL, getting a p0420. I'm a dummy and changed out my bank 1 sensor 2 thinking it was b1s1. I have the correct part now but am looking for pictures of where I can change the bank 1 sensor 1 o2 sensor. There's a lot of info on it for 250/350 but I can't find any for ISF. I just know it's on the drivers side but where in the engine bay would I need to reach to get to it?

Jwconeil

Scroll through here. https://www.clublexus.com/forums/is-...in-limits.html

They are directly on the manifold in front of the cats. I’ve never done this, but wager it would still be from under the car or maybe even through a wheel well.

Any body with experience?

cuongiee

thanks! this helps a little. i've watched a video of some header installs and that sort of helped as well but I wanted to attempt to do it while it is in the car like the downstreams are done

93MSB

iTrader: (8)

It's very tight, probably need to drop subframe for any decent access. Assuming stock headers and original O2 sensors, it will most likely be seized in the manifold. FWIW, I was not able to remove my O2 sensors with the header off the car without damaging the threads.

I think it would be wise to go into the project with the plan of removing the header

cuongiee

thanks that's what i needed to know