Hi,


1995 chevy blazer, 4 door, 4x4, 4.3l, automatic.




see picture. there is two sensors here. one with blue connector, the other more or less below it. not sure what that one is, pretty rusty.





can someone tell me, what these two sensors are ? is one the 02 and what is it called, upper or lower.


My recent trip to autozone, code reader, came up with 2 of them are bad.


hope you can help.


this is driver side .







thanks