> I would think if the O2 sensor was out of range it would turn
> on a check
> engine light.
I agree, if the ECU has gone into limp mode, then it will certainly light
the trouble light. But, O2 sensors usually fail gradually, so it still may
be that a new sensor will improve tailpipe emissions.
>I was pleased to learn that my daughter's 91 E30
> BMW had a
> procedure where you short 2 pins on thier special BMW
> interface connector to
> enable a check engine light blinking capability where you
> could read the
> codes.
I think that has been a standard feature, ever since trouble codes were
invented. In addition, most cars have a magic sequence that will flash the
codes (or at least a subset of them). I forget the exact sequence for my GM
car offhand, but it's something like hold the accelerator partway down and
turn the key on-off-on-off-on with a 2 second pause in each position.
Randall
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