Catalytic converter

[rgar98]

Hello,

Got CODE P0420. Is there any immediate mechanical reason to get this corrected? Can this damage the car or seriously degrade its performance?

Thanks,

Rich

[noR]

Could degrade performance eventually.
Probably will cause problems w/your rear O2 sensor if left as is.

Worst part is probably the fact that the CEL will give you a false sense of security and when a REAL threat comes along, you'll have no advanced warning.