How many sensors are there on a 2000 Ford Mustang base?

I'm confused. I have a check engine light. I changed bank 2 sensor 1. I believe this is the drive's side, right? And sensor 1 = upstream bank 2 = driver's side & sensor 2 = down stream bank 1 = passenger side, yes?

So there's just 1 02 sensor for each side, or is there 4? For example there's both an upstream and down stream 02 sensor on the driver's side, and an upstream and down stream 02 sensor on the passenger's side. I'm confused.

Instead of wasting time and $$, why not have an OBD code reader attached to the vehicle to get the correct codes, then you can look online at a code reader site and see exactly what is causing the codes to be shown

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