With a P0420 code, is there a risk of damaging anything?

Question

I am concerned that by not taking the truck in to the dealership, I may cause damage to other parts. I understand that I need to keep checking for other codes that would be hidden by this code turning on the SES light.

Answer 1

depends what is causing the problem for the P0420. a clogged catalyst converter might cause damage in the long run. a bad oxygen sensor will cause rough idle, misfire or hesitation.

Possible causes

- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Powertrain Control Module (PCM)