I have a slightly loose cowl on top of the radiator (funky little rivet-
type connector loose) that sometimes, on startup, jiggles the O2 sensor
going into the engine from that point, according to a mechanic. Will this
Service Engine light find its way off by itself at some point or will it
always stay on until the battery is disconnected?
Thanks the reply. It will clear almost immediately, or after only a few
seconds of no juice. I'm just wondering if anyone has experience with
this light on and on a restart of the car, say a day later, will have the
light clear itself? (even though I realize the code stays in the
You were told right; there are multiple sensors (hot wire or pressure
and temp plus throttle position) in the intake system. They provide
data to compute the mass flow of air into the engine and enable major
adjustments to fuel injection flow rates and ignition timing.
The "oh-two" sensor isn't one of those in the intake. It looks at
oxygen content in the exhaust gas. Its output is used to optimize
fuel-air ratio -- making for better gas mileage and fewer "uglies" out
the tail pipe.
That's a frequent cause of a Check Engine light -- but, it's easier to
read the codes and make an intelligent decision before getting into
coveralls and skinning your knuckles -- that's what everyone else is
There are five configurations of sensors for C4s -- L98 had two, LT-1
was another, LT-4 slightly different and of course the ZR-1 was all to
it's own. When you post a question here, provide the model year and/or
engine code. That should enable a more direct answer--possibly with
better info right off the line.
Thanks PJ. Much appreciated and informative. I spend my time in computers
and networks and therein lies my expertise and not in the "shadetree
mechanic" arena. I can only appreciate those that can open the hood and
actually know what to look for. I have a mechanic that can do that and I
would trade him the IT knowledge for a little mechanical ability. I know
enough to get me into trouble with cars and that leads me to know enough
to keep my fingers out of the mess before I make it a bigger one. There
is really a lot of misinformation about vettes or cars in general and I'm
just fishing for some info in order to get rid of some of the noise. The
least I can do is to go through the procedures to find what error code is
left over and what it is connected with. Beyond that, I'll let someone
else work it over. Thanks again.
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