120xxx miles

And check engine light is always on in city/town but turns off when in the highway/freeway.

What could be causing this?

This post was edited by kevin7 on Jul 16 2015 12:23pm

get the code(s) read

02 sensor

Exactly was thinking.

Is it a cheap fix? I don't own this subie, but the guy I might buy it from said it is

depending on which 1. If it's the 1 on the header, it's going to be fairly expensive for being an 02 sensor.

www.autozone.com look up the part.... And add 100-150 if you are having a shop do it

No.

Use rockauto.com

why is everyone assuming it is the o2 sensor?

best bet is to pull the code...