2001 Legacy GT.
Cel comes on, O2 sensor below threshold. Replaces O2 sensor 1 & 2, replaced cat. Cel comes back on every 6 months the cel comes on with same code. Now it comes on then goes off about once a month.
I’m stumped.
2001 Legacy after sitting in garage overnight Put into reverse and you get a loud clunk in the rear. After driving for 1/2-1mile there is the normal sound when putting into reverse. Only clunks after sitting overnight. Rear axles are fine, drive shaft only has 3/8” rotational play. I am stumped. Fluid is fine.