I have a P1135 code (bank 1 sensor 1) and I can only see 1 o2 sensor on my exhaust pipe, before the cat. There could be 1 after but I didn't look hard.
Anyway, the parts guy at Toyota thought there might be only 1 unless it was a California emissions vehicle. He said the v8 has 4. But I didn't really trust him much. He told me he could order the 1 sensor for me for $127 which didn't seem bad.
I guess my qeustion is, do I only have 1 sensor? The autoxray we connected indicated there were two sensors, sensor number 2 had a 1.275 voltage and number 1 kept saying there was no data which led us to believe that it was the bad sensor.
anybody have any ideas? I know the v6 tundras are not as common as v8s so it's a little harder to get info.