Does anyone know how to replace the O2 sensor that goes into the CAT on a 04 TSX?

 

It's probably just a wrench and that's it...

I can't remember that one, but I changed the pre-cat one and it was simple. If the in-cat one requires you to take off the cat heat shields, being in California I can't see you having any rust to deal with, so that would be simple as well.

 

Yea it isn't hard unless its melted on, replacing a sensor is also a good waste of 300 bucks...
if your under 50k miles some dealers will warrenty it if cat is not aftermarket.

 

I had a check engine light I got it checked out and was told its my second o2 sensor in the CAT, my car has over 50k miles so getting it fixed under warranty is not an option. I know where the sensor goes into the CAT but where do I conect the electrical connection? and why is replacing a sensor a waste of 300 bux? The sensor can be had online for 195

 

Becareful online buying it some sensors dont work for our car. I bought replacement honda genuine parts which are around 200 from hondaacuraworld.

Something i wouldnt try testing, but if your car over 50k still some dealers that are nice will replace it for free. unforntately i haven't had the luck over here getting it replaced.

 

The connection is somewhere tucked in a hole in the chasis you might have to get in under the front passenger seat (under the carpet) and try tucking it in from there. I wish i had a diagram but i saw the guy at the shop i go to do it.

It was a tight fit getting the old one out, but i think the new one needs to be done from inside the car then looped to the outside under chasis. then connect to the cat.

 

Yeah just uninstall the old one (follow the wire), and install the new one using the same path. Can't really be more simple.

Definitely go with an OEM O2 sensor... whether it be from a dealer locally or online, get the OEM one. I haven't found replacement wideband sensors to be cheap enough to warrant getting them over an OEM one.

 

anyone in the sf/bay area want to do this install for me??

 

Man, if you can turn a wrench, you can do this installation. It's SIMPLE.

 

Just get an O2 sensor socket.

 

My dealer replaced it for free post warranty at 52K miles (on an 05). If you're past warranty but still fairly close to time or mileage, it couldn't hurt to ask.