Just left the dealer after paying my $118 diagnostic charge and they tell me that passenger side after cat O2 sensor is bad and the the rotary coupling needs replaced to fix the SRS system and light. $1200 to do both.

Definitely going to do the O2 sensor myself but wanted to get some thoughts on the rotary coupling. Has anyone done this repair? Easy? Hard? Should I just let the dealer do that since it deals with the airbag? I also think this might be referred to as a clock spring?

This is on a 98 Discovery.

Would appreciate any thoughts or suggestions.

thanks