"Faking" an O2 sensor

[Peter Gargano]

You're right, $90 is a bit steep for a resistor (glorified or not!).
But an O2 simulator has to send a varying signal to the ECM. What
you're paying $90 for is a fake sine wave simulator - perhaps it's
not much more than an 8 pin 555 chip, and maybe you're paying for a 
square wave. I guess there's no competition in the marketplace.

OTOH, perhaps they're much more complex than this?

PG

MysticZ wrote:
> 
> I'm a bit annoyed now. On OBDII F-bodies there are 4 O2 sensors. Two
> before the cats, two after to make sure they're working. When removing
> the cats (which I don't plan on doing) you have to use simulators to
> keep the ECM from throwing a code. These simulators sell for about $90.
> What's bothering me is WHY they're $90?!? Is there something I'm
> missing? Shouldn't you just have to give it a voltage on the lean side
> of the pre-cat sensors? Can someone explain what I'm not understanding,
> or am I right in thinking that $90 is a bit much for a glorified
> resistor (like the skip shift eliminator for T56 transmissions, which IS
> a resistor)?
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