1. How many O2 sensors are there in a 2000 Boxster?
2. Do they come in pairs or singular when replaced?
3. If CEL indicates one is bad, can it be determined which one specifically?
4. If CEL indicates one is bad, should I replace just the bad one or all of them?
5. I have driven car and there doesnt appear to be any performance issues; Can the boxster perform normally with bad O2 sensor?
Thanks!
2000 Boxster 36000 miles