V8Q: Reference Sensor & Idle switch BTDT

["Buchholz, Steven" <Steven.Buchholz@kla-tencor.com>]

Well, I finally pulled the codes on my car last night ... the ECU is telling
me that both of the above have a problem.  I did confirm that the idle
switch (G60) is not closing ... even though I can hear a definite click when
the throttle goes to idle.  I wanted to see if any have had to deal with a
similar problem ... I'm tempted to take the thing apart to see if it just a
broken wire (as is so endemic on the MC engines) that can easily be fixed by
opening up the module.  I do know that the contacts inside microswitches can
fail too ...

I also thought I'd check to see if anyone has replaced their own reference
sensor (G4) on the PT engine.  I stuck my head up in there and it appears
that there is some sort of a heat shield I'll need to remove, but the
exhaust header makes it look like I won't have a lot of access even then.
Is the sensor accessible at all with the intake covers removed?

TIA!
Steve Buchholz
San Jose, CA (USA)