How many O2 sensors in

[D&SW]

Howdy!
I have 2000 Forester L , automatic, 2.5L engine, +80,000, which is
showing a CEL/ECU P1133 fault code. I believe this is bad O2 sensor, but I
do not know if I have more than one sensor, and it's (their) location. I
figure I should have all the O2 sensors replaced since Subaru recommends at
60,000.

However I want to take to a local (very good) mechanic rather than the
dealer (80 mile away) who always tries to force transmission flush, injector
flush, brake flush...a general douching for +$1200... which (IMHO) is a
rip-off.

Can any one help with number of O2 sensors? and general locations (exhaust
manifolds, cat converter, etc)?

Thanks folks!!!

 

[Edward Hayes]

Two O2 sensors. One if front of the cat and this one sets the fuel air
mixture. The second O2 sensor is back of the cat and basically checks
that the front O2 sensor and other ending management stuff is working
correctly.

 

[D&SW]

Thank you very much for your help!!