Exhaust mods and OBDII - Saab 9000 Bulletin Board - Saabnet.com
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Exhaust mods and OBDII
Posted by Bob (more from Bob) on Wed, 04 Oct 2000 08:52:38
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I'm in the process of locating parts for my new 3"
exhaust system from the turbo back. My question is
this. I'm looking at a replacement catalytic converter
made by the parent company of Magnaflow. My existing
system has two oxygen sensors: one at the top of the
downpipe and one that sits on top end (back)of the
cat'. What role does this second oxygen sensor play
in the OBDII system. I imagine that it's critical to
the trionics' control in leaning or richening the fuel
mixture when the vehicles cold, but am not sure. My
conservative side says that I should incorporate it into
my new cat', but the other part (the lazy one, I guess)
is hoping that I can just disregard it. If anyone can
shed some light on this 'dark' matter, it would be very
much appreciated...tia
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