I installed invidia 70mm test pipe with built in cel fix and after about 10-15 miles of driving the CEL came on and I checked it out, it said P0420 Catalyst system efficiency below threshold. What can I do about this? thanks

 

Get another anti fouler and see if that does the trick.

 

 

where can I get a anti fouler? The code is for catalytic converter, I thought it would be for the o2 sensor.

 

You can get a anti fouler at any auto parts store, you don't have a catalytic converter so you have to trick the o2 sensor.

 

Useg both anti foulers that come in one pkg. Drill one out and piggy back this on top of the other. I have an HFC that developed this problem after 3yrs of use and one AF didn't work.

 

If you ordered it from a vendor, you can check with Invidia to see if they have an adapter they can send you for free. My TP was supposed to come with the CEL fix but didn't and I sent them an email about it. They are going to send me an adapter for free but they haven't gotten any shipments in. Otherwise, you can go the anti-fouler route (I tried but didn't have a tool to drill out one of the anti-foulers so that the sensor would fit) or just ignore the CEL for the time being (but get it checked every couple of weeks to make sure there isn't another code).

 

so i wont do any damage driving with the CEL on?

 

nope your ok to drive it

 

Go to any auto parts store and get these.

Then they go on like this.