Hello friends,

CEL is on in my 98 civic.
Plug in with my OBDII and saw P0420.
Dropped the car to mechanic yesterday.
They replaced my catalytic converter 2 years ago.
And... I just got a phone call, mechanic claimed that my computer gond bad...
They said they can't read any code.
Mechanic suggested to replace computer $900 (new) or $460 (used).
So, after all these, they may find P0420.

Any suggestions?
I'm gonna go to other mechanics and get second opinion today.
What if computer really gone bad? Probably it is.