"Charles Kormos" > wrote in message
...
> Car is 1996 Corvette with LT1 engine. Codes are P0131, P0134, and
> P1133.
> I plan on changing the O2 sensor but which one?
> I think I know which one, but just to be sure that's all I'm saying.
> Let's see if I'm right or wrong.
> Which one would you change?
> Do I really need the special tool?
> Thanks in advance.

My guess won't count on which one to change first but, I'd try the
PO1133 code (HO2S Insufficient Switching Bank 1 Sensor 1) first as it
may affect both sensors. Will you need the special tool answer is yes,
and don't buy a cheap one.