In action:

https://youtu.be/HNlmqi0Fuag?feature=shared

Socket tool sucks for the post-car O2 sensor as you can't get an angle on it to get a clean fit AND good leverage on it at the same time....

I ended up giving up rather than risk damaging something and bought a nice fat 22mm spanner. With the right tool, I undid it in 10sec.

It's not an import. When I bought the car, it had an after market single DIN (with ISO cables), but the original fascia trim from the Sony WX-C570R was there. I now have the Toyota 58806 (the one I believe is referred to as "Fisher Price"), but for a time a unit from a Land Cruiser which only used one connector.

Have you tried warming up the pipe and then spray some plusGas and then undo it?

To deal with the existing cat:  Cut the end off the O2 sensor, so you can get a standard impact socket on the thing, heat, plus gas and breaker bar!

I would recommend getting an approved type cat from Cats2u.  The three amigos can always be dealt with, even if it means drilling out studs and using nuts and bolts.

An original cat will be close to the end of its useful like anyway.

Do get OEM crush rings, the aftermarket ones are bobbins.

Hello, I've been trying to fix this issue for a while now and with the MOT coming up soon I need some tips to get it fixed.

The post-cat O2 sensor was stripped after I tried a wrench to loosen it (there wasn't enough space for my O2 sensor tool). Big mistake. Now the nut is too rounded to fit the correct O2 sensor removal tool.

I've tried using penetrating oil, blow torch and mole grips. Although I'm able to get a good grip with this method, it won't budge.

Took the car to an exhaust shop and they said "they wouldn't touch it" because it is "rear-engined". Interesting... What have mechanics become these days??

Thinking if worst comes to worst I'll order a new main-cat and replace the O2 sensor that way. But I fear the 3 amigos will potentially be a bigger PITA if the bolts are like the others on the car lol (fortunately the car is clean from structural rust, 110k miles W-reg).

If you have any tips for trying to remove this it would be much appreciated.
 

Is your PFL an import?  The UK ones had a Sony WX-C570R head unit fitted at the port of entry.  When I still had that unit in my car I met one of the Portbury dock team who fitted them with the Thatcham alarms - car was at Haynes breakfast club and a conversation started!

It's a PFL. But I think that diagram is incorrect, at least for my car. The previous head unit only had CN700 plugged in and everything worked. The other 3 connectors were left unplugged (because there was no where to plug them in).

Could be incredibly wrong, but assuming facelift model, the headunit was used in other Toyotas.

Optional extras across other models would have included CD changers, an extremely primitive sat nav, and steering wheel controls.

So I replaced the stereo for the stock OEM one. As I put all the electrical connectors back in, one won't quite reach so I didn't bother forcing it. It's the small one with only 1 wire. What's it for? Everything appears to work without it but just wondered what it was for.

Aerial works. Illumination works.