Putting Angle Sensor In

I am getting the 5 flash error code on display on my 2006 Rubicon. Took the panels off and checked to see if plug was dirty on angle sensor and looked good has only 500 miles on it. Added some dielectric grease and tried to reset code with charged battery still no luck.

So I ordered a new angle sensor and was wondering if I HAVE to take exhaust pipe off to install new one?

I plow for a lot of elderly neighbors and need to get it fixed with more snow on way.

The thing worked great Sunday morning then 5 hours later it was flashing. Shifts fine but sputters in reverse like everyone.

Please help and thanks!