Does anyone know the exact size wrench required to remove the upstream O2 sensor on a 94 ES300?
I'm just wondering before I get into it so that I dont have to make a special trip to the parts store for some odd ball sized wrench.

 

Toyota/Lexus uses metric tools. It's been a while since I changed the O2 sensor on a 1MZ-FE, but I think it was 12, 13 or 14mm. I always keep 10 - 14 nearby just in case.

 

Thanks. If its a smaller sized wrench then I'm covered, but anything past a 17MM I lack.

 

Yeah it's rare that you go past a 14mm when working around/near the engine.

 

Simple project done. Wrench used to complete the job, 7/8 Craftsman which equals out to around a 21MM or 22MM probably.

 

Which O2 sensor were you on? The one after the Y pipe or the one on the front bank of headers? Anyways good find. It's been a long while since i've touched the O2 sensor on my Solara. The O2 sensor after the Y pipe isn't fun. I had the hardest time trying to thread the damn thing back in.

 

The upstream, fire wall side sensor. Wasn't all that bad, one of the four on my F150 was far worse.

 

Yea o2 sensor sockets arent small