Is there a way to tell which o2 sensor is bad. I have a 98 prelude with a check engine light on. I did an obd2 test and it came up. I know there are two of them, one before the cat and one after the cat. Are they different sensors? or are they the same but only two of them? Any help would be appreciated.

 

they are the same, but just two of them

 

How do you know which one is bad? Is it burned or something? What are the physical signs?

 

jump the service connector and get the code or codes, the trouble code number will tell you which one it is

 

the code should say sensor 1 bank1 or sensor 2 bank1

 

the code will tell either o2 1 or o2 2, one 1 is closer to the engine