2001 Chevy Impala 4 cyl Two Wheel Drive Automatic 144, 00 miles
I recently had my 2001 chevy impala LS inspected to have it registered in DC. I failed and got several of the problems that they found fixed. This included new Coolant temp sensor/thermostat, sparkplugs/wires, air filter, PCV valve, E/GR valve and an oxygen sensor. However the check engine light is still on and the erroe code P0420 Catalyst System Efficiency Below Threshold (Bank 1) is still present. What does this mean that I need to repair and what do I absolutely need to purchase to fix this? I was told that a Catalic converter was needed, but is there another alternative that is less expensive?
have the same problem?
Monday, February 16th, 2009 AT 4:23 PM