Background - 2004 LX 470 205k miles
Got my first CEL a few months ago and it was the pass side bank 3 sensor. I had several other projects going on so it wasn't being driven much, but finally got around to replacing all 4 sensors. Rented an O2 socket, and replacements went off without a hitch.
Finished most of my projects last week and cleared CEL codes and drove the LX around for the first time in a while. After about 15 miles CEL/vsc lights go off. Plug in the OBDII and now I'm getting P0420.
Did some research on P0420 and understand this can mean many things that techstream could best diagnose. Went under the truck first to do a visual inspection on the upstream driver side sensor and see if I could find any glaring problems. Immediately I knew I had one. I had a new 22mm wrench that miraculously could give me some leverage down there and noticed I was not getting anywhere close to the amount of leverage I need to get this thing off - this was very confusing to me as when I did the replacement they came on and off so easily.
Finding ways to get more leverage I rented the same O2 socket to get back to work with a normal socket wrench - still not enough leverage and now I'm really worried and confused. Lifted the truck and got a breaker bar on it and still not enough leverage. Now I know something is completely screwed up with the threads.
Used a different O2 socket and started getting some play after rocking the socket clock wise and counter clockwise and finally got it out. None of this felt good at all. Brand new O2 sensor is below and you can see the mangled threads.
Other piece of possible useful info is that I did use antiseize when I replaced these. I thought I saw a forum use antiseize for O2 replacement here on MUD but maybe I was mistaken - not sure if that's relevant info or not. Other info is that these are OEM equiv denso O2's ordered from sparkplugs.com
Wondering in general how screwed I am and/or any solutions I might have at my disposal. Am I already looking forward to retapping the female threads in the upstream sensor if that's even at all possible?
Thanks in advance for any help/advice. This is definitely the most worried I've ever been.
Got my first CEL a few months ago and it was the pass side bank 3 sensor. I had several other projects going on so it wasn't being driven much, but finally got around to replacing all 4 sensors. Rented an O2 socket, and replacements went off without a hitch.
Finished most of my projects last week and cleared CEL codes and drove the LX around for the first time in a while. After about 15 miles CEL/vsc lights go off. Plug in the OBDII and now I'm getting P0420.
Did some research on P0420 and understand this can mean many things that techstream could best diagnose. Went under the truck first to do a visual inspection on the upstream driver side sensor and see if I could find any glaring problems. Immediately I knew I had one. I had a new 22mm wrench that miraculously could give me some leverage down there and noticed I was not getting anywhere close to the amount of leverage I need to get this thing off - this was very confusing to me as when I did the replacement they came on and off so easily.
Finding ways to get more leverage I rented the same O2 socket to get back to work with a normal socket wrench - still not enough leverage and now I'm really worried and confused. Lifted the truck and got a breaker bar on it and still not enough leverage. Now I know something is completely screwed up with the threads.
Used a different O2 socket and started getting some play after rocking the socket clock wise and counter clockwise and finally got it out. None of this felt good at all. Brand new O2 sensor is below and you can see the mangled threads.
Other piece of possible useful info is that I did use antiseize when I replaced these. I thought I saw a forum use antiseize for O2 replacement here on MUD but maybe I was mistaken - not sure if that's relevant info or not. Other info is that these are OEM equiv denso O2's ordered from sparkplugs.com
Wondering in general how screwed I am and/or any solutions I might have at my disposal. Am I already looking forward to retapping the female threads in the upstream sensor if that's even at all possible?
Thanks in advance for any help/advice. This is definitely the most worried I've ever been.