03 jetta, I get 3 errors all po -3000,411,& 420.no idea what to do.

Question

I get errors cleared than a day or so comes back.

Answer 1

Hi there,

P0300 indicates a misfire on random cylinders. Here is a list of possible causes.

P0300 VOLKSWAGEN - Random Cylinder Misfire Detected

Read more: https://www.autocodes.com/p0300_volkswagen.html

P0420 indicates an issue with the catalyst system. Here is a list of possible causes.

P0420 VOLKSWAGEN - Catalyst System Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0420_volkswagen.html

P0411 indicates an issue with the secondary air injection system. Here is a list of possible causes.

P0411 VOLKSWAGEN - Secondary Air Injection System Incorrect Flow Detected

Read more: https://www.autocodes.com/p0411_volkswagen.html