Hammer1234

Hello all,
I own a 2011 C300 with 81k miles on it.
The check engine light came on. When I checked it, the code P0410 appears.
I erased it a couple of times but would come back on in a day or two.

1. I replaced the relay.
2. I replaced the pump, $200 at Oreillys.

Light came back on in a day.
I do not see any air lines crimped.

Any advice?

Thank you,
Hammer