Hi, CEL came on and idle is very slightly rough (bouncing). I went to autozone and had them pull codes. They came back with P0134, and P1116. Specifically:
P0134 - Heated oxygen sensor - bank 1 sensor 1 (H02S11) sensor circuit no activity detected. Air/fuel ratio concern - learn or rich. Probable cause open or short circuit concern, faulty H02S11 (Bank 1 sensor 1).
P1116 - H02S sensor heater circuit open bank 1 sensor 1. Open or short circuit condition. Probably cause failed H02S11 (Heated oxygen sensor - Bank 1 Sensor 1).
Sounds pretty cut and dry to me. Oxygen sensor. But should I be able to tell which one has failed from just this? I'd rather not replace both at $90 - $160 a piece. Or could this be something completely unrelated? Any way to test easily?
Car is just about bone stock 2000 1.8t (AWD code). Upgraded diverter valve, always good about oil changes, spark plugs, air filters, belts, etc. About 200,000 miles.