200q20v digest, Vol 1 #1012 - 10 msgs

Brian Link brianl at starsys.com
Wed Jun 26 11:40:21 EDT 2002

[Brian Link]  If you have a bad O2 sensor, you should get a check engine
light 10 - 15 mins after driving.  When mine went I still had full boost,
and the car ran fine. The OEM sensor is a 3-wire (+) (-) and signal.  I
replaced mine with a bosch sensor ( $35 Auto Zone part number 13913), and
spliced it into the OEM harness.  As for advice on what could be wrong with
your car,  re-check your  bypass valve and frequency valve plumbing.  Did
you remove your MM hose and check for cracks? Checked for error codes?
clogged catalytic converter or two?

Good Luck

Brian Link

[Snip]  I'm an "old" newbie in that I've been reading the postings for
about a year,
but this is my first posting.  I've had my 200 20v for about 10 months now.
It has always run well, started quickly and idled very consitantly and
stalled.  However, I've never been able to get it to boost higher than 1.2
bar.  The Multi function temp sensor was faulty and has been replaced, but
did not improve the boost.  The wastegate bypass valve is new along with
frequency valve.  I've also relaced the hose which runs from the WGFV along
the manifold to the back of the engine and have checked the "Michellin man"
hose.  The plugs are fine and correct. I'm now suspecting the O2 sensor.
questions are; can a faulty O2 sensor result in retarded boost???  What, if
any other symptoms may a faulty O2 sensor cause?? If the sensor is bad and
disconnected, would I see a difference in the car's performance??  and the
present O2 sensor has three leads to it, is this a generic sensor or an OEM

Any help would be greatly appreciated.



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