Hello Everyone!

I have a 98 Honda Accord Automatic 2.3L. Over the weekend the CEL came on. I took the car to AutoZone to get the codes. One is P0420, I'm thinking about doing the Spark plug non- fouler. Have anyone had any issues with this?

The other code is P0420. I coudn't find an exact answer for this code. Does this mean I have to replace the Transmission?

Definition:
Lock up clutch does not engage- stuck in 4th gear.

Probable Cause
1-Open or short circuit condition in pressure control solenoid A circuit
2-Poor electrical connection
3-Failed pressure control solenoid A

Any help is greatly appreciated.

Thanks guys!