well, it seems my car is running better. the old o2 sensor was all white and crusty, the newer dx one looked better. the check engine light has only come on once this weekend, as opposed to right after i drive with the crusty sensor, so im wondering whats goin on. no im no running rich, i run shitty octane like..89 haahha. but it hastn come on saturday or sunday, so idunno. the guy i got the car said ti was obd-1, anyway i can check, he said it was a 93, but he lied about alot of stuff on the car, so i dunno if i believe him. anyways, is an obd-1 car have two o2 sensors??? if so what do i do, i only have one.