youstolemybeer

Hi, I just replaced the vtec gasket on the 2000 civic ex, It was cold as heck out so I used a heat gun on the solenoid/head for about 20 minutes to keep the Loctite gaket sealer warm so it would cure. Now I am getting a po420 cel.
Do you think the 2 are related or just a coincidence
thanks
Steve

CX-Adam

Doubtful.

You need to list the make and model of the car.

P0420 is the Catalytic System Efficiency Below Threshold

The service manual lists the probably causes as:

- Three Way Catalytic Converter
- Secondary Heated O2 Sensor

This is from the 96-00 civic service manual

youstolemybeer

2000 civic ex all stock
I did have to take the fuel injectors out and the throttle body off to be able to get a drill to fit (bolt broke off in the head at the vtec solenoid).