2nd primeary o2 heater? cant locate where it is .
d16y8- book says 96 model has two o2's but can only see one up front. i looked under car before cat and after cat , can see sensor anywhere,
aftrer market header installed with to o2 ports .1 up front and one in the down pipe. under port is plugged. so how can i get rid of light..............

 

The code reads primary O2 sensor heater - I don't know what it has to do with the secondary O2 sensor (the one in the cat) but I don't think it does.

There was this problem that somebody had (same CEL) awhile back, forgot what the answer was as I don't know.

Search, it's been covered before, what it means and how to fix it.