courir26@yahoo.com wrote:

> My daughter has a 99 Civic LX, California Model (LEV I think)?
>
> Does this car have one or two O2 sensors?
>
> She got a CEL, Autozone says their scanner cannot differentiate between
> a front or a rear O2 sensor failure.
>
> The front sesnor is about a year old.
>
> Are there front and rear sensors, or is the Auto Zone dude all wet?
>
> The rear sensor price is about $250 (if there is such a thing).
>
> Tom

I don't know if it has one or two, but if the new front sensor is an
aftermarket unit and not OEM, it could pose problems.