I've been lucky so far, '85 Ur-Q, >192k miles, orig cat and I've never
changed the O2 sensor (it had 52k on it when I bought it in '87). Has never
failed the sniff test and usually passed by a very wide margin. Has passed
the Taxxachusetts sniff test (When I lived there some years ago in the past)
*without* the cat! No more sniff tests in NH though. Horay! Vote Republican!
Vorsprung durch Technik,