View Full Version : Replace the cats?

07-19-2011, 09:13 AM
My 2000 Legacy L sedan just threw another 420 code, Catalyst below threshold efficiency. I just replaced the front and rear sensors about 500 miles ago. It isn't loosing coolant so Im pretty sure its not coolant in the exhaust and the plugs have no coating. Looks like I'm going to have to put another $350 into the car. Any oher ideas before I spend the money? Thanks. Dwight