P0420 Catalyst System Efficiency Below Threshold (Bank 1)
I have a '95 Eclipse GST with 86k miles and my "check engine" light came on recently. I took it to my local dealership and got back a OBD code of P0420 (Catalyst System Efficiency Below Threshold (Bank 1) ). He recommended replacing the rear O2 sensor --AND-- the converter ($1369).
My questions are: Shouldn't the dealer know if it's just the rear O2 sensor by doing some diagnostic tests-- thus saving me +$1000 dollars? Or would he definately know it's the converter, and if so, why is he suggesting replacing the rear sensor as well? I just want to make sure everything is on the up and up...
Oh, and also: He asked me if I planned on keeping the car for long, and I said not if it keeps costing me this much to run it. Then he said I probably should not get it fixed because it's only going to get worse. You think he's being sincere, or is this just a way to get me from going elsewhere to find a cheaper solution?
Last edited by xj220 : 01-31-2005 at 04:03 PM.