Is this a problem, I can ignore.

Question

How can I fix it. I cleared the code with a scanner but keeps reappearing after some days.

Answer 1

Hi there,

This code points to an issue with the VTEC system. Here is a list of possible causes. 

P3400 HONDA - Valve Pause System Stuck Off Bank 1

Read more: https://www.autocodes.com/p3400_honda.html