The bank 1 O2 sensor is on the exhaust manifold by the firewall. To get a socket on it, you'll need to remove the coil pack. Get an O2 sensor socket from a car parts store for about $5. (It has a slot for the wires) There's just enough room between the firewall and the exhaust to get the socket and a thin ratchet/breaker bar onto the sensor. I found it easiest to reach while kneeling on the UIM. Break it loose, unscrew/unplug it, and put in the new one. (Use anti-sieze on the threads

) Put the coil pack and wires back in place and your ready to roll....
Oh yeah, the codes for the 95s are listed in the link on the
FAQ section page.