If you start noticing poor gas mileage and poor performance it might be O2 sensors and it is time to replace them. If you get a check engine light then it is time to replace them but pulling codes will verify it.
These are best quality ones to get for your SHO, in fact you may find your OEM O2 sensors stamped with Bosch.
Chances are when 1 goes out the other might not be far behind so if you replace 1 you might want to do the other.
MTX O2 Sensor: 3 Wire and 10.75"
ATX O2 Sensor: 4 wire and 10.5" long
Includes 1 O2 sensor.
You should put anti-seize on the threads before installing.
1989-1995 SHO MTX
1993-1995 SHO ATX
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