Ford Escort - Why does "check engine" light turn on?

[Frederic Breitwieser]

Typically, its one of two things...

Your O2 sensor has deteriorated, or your catilytic converter is "stuffed 
up".  An aftermarket cat convertor for the escort is about $120 US on the 
east coast, and I'm not sure what the o2 sensor goes for.  With the high 
mileage on your vehicle, it really could be either.

Fred

On Tuesday, May 06, 1997 11:32 AM, Dmitry Samsonov 
[SMTP:dima at dusty.physics.uiowa.edu] wrote:
> Recently I bought Ford Escort 1991 with 1.9 l fuel injected engine. It
> runs fine,
> but if I drive on the highway at about 60-70 mph "check engine" light
> comes on.
> If I press the accelerator for a few seconds and then release it (and
> return