At 01:38 PM 1/23/2001, Keith Adams wrote:
>It depends on if it's a 1.9 or 2.1  Ron (from BD) wrote and
>said the bypass pipe for the 2.1 (replacing the cat) is NFG
>because it doesn't have a fitting for the O2 sensor.
>Therefore, the O2 sensor is in the cat.

Semantics...the 2.1 sensor is mounted at the input end of the big steel can
that houses the catalytic converter itself, which is made of ceramic.  I
could surmise that they put it there because that was the farthest they
could get it from the engine (therefore better gas mixing?) without putting
it *after* the cat, which would not work.  The sensor for the 2.1l has an
internal heater which means that it's not dependent on the hot exhaust
stream to keep it working; therefore it doesn't *have to* be right up close
to the heads.  There may be another reason(s) why they put it there, I'm
just guessing about the gas mixing.

cheers
david

David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"