O2 Sensor Job - Difficult?

[JRZEE2000TR4LTD]

Okay I hope I am not hijacking this thread.

I have 2000 4Runner V6 3.4L 4X4 Limited - CALI - (2) CATS

Got a P0420 Code was going to replace the downstream O2 Sensor behind second CAT right before muffler and if that didnt work I would try replacing the A/F Sensor up front. Any suggestions?

Also, which Denso sensors (part numbers please) do I need for both?

Thanks

234-4261 (downstream)
234-9002 (upstream A/F)

Rockauto link

 

[4rFrog]

It's an easy job, do it yourself, use liquid wrench on the old 02 sensor, unplug, unscrew and replace.

 

[feta]

Okay I hope I am not hijacking this thread.

I think you are

but you can look at this anyway
P0420 Oxygen Sensor Simulator Hack: 7 Steps

 

[CelticRunner]

It's an easy job, do it yourself, use liquid wrench on the old 02 sensor, unplug, unscrew and replace.

I concur. I kind of feel like if I can somehow manage it then anyone can do it. The hardest part was working in the tight area. Would have need easier if I had the pivot ratchet with torque attachment.

Instead I started it with a small wrench and a thick dowel, then tapped it loose. Ill probably rent the right tool next time, or maybe buy it if I’m in a better financial position. Haha