Rear O2 Sensor

[92xsaabaru]

I need to replace the rear O2 sensor on my 05 Saabaru. Do I need to get a stock one or one that matches stock or any off the shelf sensor and save some money? I have an AP so not worried about throwing a CEL. My buddy told me the rear O2 sensors aren't that important and save the money and just get a cheap one from Autozone or something? Is this true? Thanks!

 

[Nigel Prodrive]

u r lucky, the rear sensor is the cheap one, and has less effect on drivability so yeh why not autozone?

 

[Mark]

is rear o2 soley for cat health, or does it serve a greater purpose?

 

[Nigel Prodrive]

is rear o2 soley for cat health, or does it serve a greater purpose?

yes, besides cat health it keeps car from running like a dog

(sorry couldn't resist))

 

[4WRXter]

^^^^Good one. Made me LOL!

 

[Matt]

ive had o2's at work, mostly on jeeps and chrysler that were super sensative to the resistance of the new sensor, wiring and wouldnt work properly...had to go factory to keep the damn mil light off....