P0402 code

[ratled]

Started throwing a P0402 code yesterday. From what I'm seeing its EGR related. Any pointer to narrow it down?

2002 5.3 gaser with 160,000 on it. I did the O2 sensors at about 100k. Not losing power, no performance issues noted and not making any unusual sounds

Thanks

Ratled

 

[OR VietVet]

The easiest place to start is to check for carbon buildup causing a partial blockage. If do that, have a new EGR gasket there to use if needed.