oxygen sensors

[icegrill]

What's the location of both sensors on a 2000 expy?
thanx for the response...

 

[applevalleyford]

the two front ones should be near the exhaust manifolds in the downpipes...before the cats. the two rear ones should be imeediately after the cats.

 

[icegrill]

thanx for the response

 

[green03]

Don't replace the ones behind the cats unless you are specifically getting codes for them. They do nothing for the fuel mixture and thus don't affect mileage, they are only there to monitor the cats "cleaning" of the exhaust.

Matt