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View Full Version : Failing O2 sensor



geckoboy86
04-09-2010, 10:04 AM
Heya!
My subie is only getting 16mpg city (even when I'm kinder to the throttle then normal). I know it doesnt count for much but the autos.msn.com page says they should be getting closer to 22mpg city.

I have a p0400 and p0420 CEL that come and go. They dissappeared for the first 50 miles on any fresh tank. They have seemed to stop showing since I took off my cone air filter and put the original box back in.

Ive replaced the EGR Valve. I know I want to replace an O2 censor but I dont know which one ( My Legacy is an OBDII).

Can I get some help?

jey
04-09-2010, 10:41 AM
Replace the front one, in front of the catalytic converter.

ouch1011
04-11-2010, 09:08 PM
The front one sits at kind of a strange angle under the car and isn't as easy to see. It sits in front of the 1st cat convertor.