i dunno if its a o2 sensor. you just running rich. and fuel hits the cats and gets converted to that smell.

you should get it checked on obd2. if its a 96+

to see if its a o2 sensor. its not worth paying 55 dollars for the bottom ones. and 65 for the upstream. i believe auto zone gives free scans. and their almost everywhere.

Experience is the worst teacher; it gives the test before presenting the lesson. Why do you need the cats when u have dogs 04 WRX - TOTALED 3-5-05 Previoius Owned: 96 Contour LX with svt kit