O2 sensors diagram

[superlek13]

I'm in the middle of replacing both the upstream and downstream O2 sensors on my vehicle, but I've hit a bit of a wall... I'm not exactly sure where each one is located. I wanna make sure i'm working on the right parts and not just guessing. Anyone know where I can find clear diagrams or location info for these sensors?

 

[orangejuice_77]

The upstream sensor is usually before the catalytic converter, close to the engine. And the downstream sensor is after the converter, further down the exhaust. For clear diagrams and sensor locations by vehicle, check out CarTreatments' guide or AutoCodes' charts, those are helpful for getting it right!

 

[Just Do It]

What year and engine are you working with?

 

[TheMoonPilot]

I'm in the middle of replacing both the upstream and downstream O2 sensors on my vehicle, but I've hit a bit of a wall... I'm not exactly sure where each one is located. I wanna make sure i'm working on the right parts and not just guessing. Anyone know where I can find clear diagrams or location info for these sensors?

Yeah, you'd probably locate them where @orangejuice_77 suggested.
But if you're still looking for diagrams, you should be able to find one through automotive parts retailers like Haynes or Chilton, or even directly from Nissan's technical information website!

 

[superlek13]

The upstream sensor is usually before the catalytic converter, close to the engine. And the downstream sensor is after the converter, further down the exhaust. For clear diagrams and sensor locations by vehicle, check out CarTreatments' guide or AutoCodes' charts, those are helpful for getting it right!

Thanks, that helps a lot! Im trying to track down a possible bad sensor, would a faulty upstream O2 typically cause rough idling or poor fuel economy more than the downstream one? Also , are those guides pretty vehicle-specific, or more general?