CEL on '95 90Q

[Tigran Varosyan]

Hi guys,

I am looking to buy a 95 90Q from a guy that is looking to offload it. It
has the 2.8L V6. The car has a CEL, which he claims is due to a failing O2
sensor. I know on most cars, a bad O2 will put the motor into 'safe mode'
which runs rich as hell and will cause you to fail any emissions test.

I assume that replacement O2 sensors are ~$100 for these cars, as they are
for most others. BTW, what kind of O2 sensor (1,2,3 or 4 wire?) does it use
and how many of them are there?

I would like to confirm the diagnosis. Is there an analog way to pull the
code from the ECU and is there a list of codes posted for this thing
somewhere?

Other issues listed as problems that I would like some feedback on:
HVAC system intermittently does not work - apparently not works more often
than it does work... Common issues?

Another problem is that the driver seat heater (a must-have for me) also
sometimes works (ie does not work most of the time). Ideas there?

The leather on this guy is cracked up to all hell! I guess seat covers is
the only way to go here...

Any other things to look for while I test drive?

Tyson Varosyan
Technical Manager, Uptime Technical Solutions LLC.
tyson at up-times.com
www.up-times.com 
206-715-TECH (8324)
UpTime/OnTime/AnyTime