Hi,

My CEL came on the other day. Hooked up my scanner and received the following message,
" Catalyst Efficiency Below Threshold (Bank 1) P0420 "

I did a search here but no results for code 0420.

Do you believe I may have an O2 sensor issue or catalytic convertor issue?

Any help would be appreciated.

Thank you very much!

 

Has no one ever had this issue before?

 

http://www.obd-codes.com/p0420

 

PM sent ur way