Originally posted by GreenGiant
I have a 2000 Legacy OBW Ltd. with 61K on the clock. My car is BONE STOCK as far as the engine is concerned. I got a P0420 "Cat. below efficiency threshold: bank 1". I was told by the AutoZone clerk that this is an O2 sensor going bad and I needed to replace the sensor. I have since been told by McDade and HndaTch627 that this is really my cat going bad. Updates to come.
- Cat. below efficiancey threshold: bank 1
I've had that twice. I had 49k on the clock. The dealer replaced the cat. 10k miles later, I've not seen that CE light.
Now I'm getting another code, P0065
. I've had 6 CE lights since Thanksgiving.
A friend had the same code on his RS a few weeks ago. Turns out that a solenoid mounted on a bracket behind the power steering resivoir. I took it apart and cleaned it, seemed to work and the light was off, but as mentioned before, its back on.
I also installed a Ganzflow intake at the same time and after 120 miles, I've got yet another CE light. I'll get it scanned tomorrow and post what it is.
BTW, the Ganzflow and K&N are my only modifications to the intake/fuel system.