PB Blaster? I would use an o2 socket on a ratchet and a pipe over the ratchet for more leverage. Also a wrench can work too.
Just drop the pipe, it only take like 10 minutes to get it down.
If your bolts aren't all rusted to crap! Starter removal gives ample access and then you aren't fk'ed if an exhaust bolt or stud breaks.
Depends on the rust. Changed one lately? I've seen plenty of s!!tcanned exhaust parts due to exactly what I mentioned. So, to be smart about it as you say, drop the starter and be done with it. And btw, rust penetrator doesn't always cut it with rusted exhaust, which I'm sure you would know from having done a few yourself right? Taking the exhaust off is as silly as the wrench on the right side o2 comment. Its not my intention to insult you sir, however, why chance all that? The starter is far easier to remove and gives you all the room you need. I have done a lot of 02 replacements on Stangs and many other vehicles. This is the easiest way. Try it and you'll see what mean. To the original poster: you'll have all the room you need with the starter out of the way.
Yes I have dropped a midpipe lately. I happen to be a Mechanic by trade and I deal with Military equipment so I know all about rust and parts that are worn out and how to deal with that accordingly. I don't think that a guy that is having a hard time removing a O2 sensor should really be screwing around with dropping the starter, as I said be smart about it.
. then I dis the battery.
It takes me less than 5 mins to get my passenger side o2 sensor out when i need to. Why the hell would you even think about dropping the starter? Mines a 2000 GT. Damn this isnt rocket science, like someone said above get a swivel and drop the H pipe, that should take all of 15- 20 mins MAX 
It takes me less than 5 mins to get my passenger side o2 sensor out when i need to. Why the hell would you even think about dropping the starter? Mines a 2000 GT. Damn this isnt rocket science, like someone said above get a swivel and drop the H pipe, that should take all of 15- 20 mins MAX
Drop the starter??![]()
It takes me less than 5 mins to get my passenger side o2 sensor out when i need to. Why the hell would you even think about dropping the starter? Mines a 2000 GT. Damn this isnt rocket science, like someone said above get a swivel and drop the H pipe, that should take all of 15- 20 mins MAX
Drop the starter??![]()
I've done it both ways. Starter is faster and easier. Make sure you disconnect the battery first.

A wrench on the right hand side?![]()
Disconnect the battery, drop the starter. Works everytime.
I have used both a wrench(I have ones that have a ratchet action) and a socket. I have never had to drop a starter for an oxygen sensor let alone for the entire H pipe. That is too much work and really shows that someone isn't sure of what they are doing. It takes 5 minutes tops to yank a sensor. I have done exhaust on mine and a friends Mustangs about a dozen times. From my stock H pipe, to my Mac O/R H pipe to my Longtube x pipe install, I have never had a single issue with an 02 sensor.
If he is having this much trouble, he should pay the guy to do it. This is 5-10 minutes total work.