1999 Suburban O2 sensor,which one??

[ace3166]

I have a 1999 GMC Suburban K1500 5.7L and get this trouble code:

P0141 O2 sensor heater circuit malfunction (bank 1-sensor 2)

 

Can somebody verify which sensor it would be? There are 4 of them. Don't want to replace all four as the truck has only 58K and the sensors are supposed to be good for 100k.

 

Thanks!!

[Frank S]

Check your fuse panel and make sure that it isn't just a blown fuse.I had the code some up for my heater circuit on B1S1 and it was just a fuse that I didn't even know existed.

[ace3166]

Thanks, I will check that out. Anyone else know which sensor it is in case I have to replace it??

 

Also I which fuse panel?? under hood or inside vehicle?

[ace3166]

All fuses are good,just need location of this O2 sensor...Somebody has to know.......

[dieselman]

Drivers side after the cat