Code P0507?

Hello all

I have the vehicle listed above 6 speed. No outstanding recalls. The throttle body, MAF and ECM were replaced to correct the issue, and it did for about 20,000 miles. Code is thrown about 42 seconds after start up. It's intermittent, RPMs is never wildly excessive. Aside from that pesky light keeping me from passing emissions. The freeze data code data from this time and last time is pretty much the same. It was dealer repaired and paid for last time, won't be out of pocket for me this time either. But I worry it won't ever be gone for good. Any thoughts on what defect could cause a ghost problem to haunt me like this?

Back 20k miles / 18 months after $$$$ repairs.