Genuine Mercedes Left Side Secondary Air Pump Check Valve - W204 R171 E350 S400 (0021407460)

This is a genuine Mercedes left side secondary air injection pump check valve.

The part number is 0021407460, which also crosses to 002 140 74 60.

It's brand new, still in its original packaging.

This valve is a critical part of the emissions system on compatible models, likely including the W204, R171, E350, and S400.

It's the left side one, so make sure you've got the right side.

It's an OEM Mercedes part, so you're getting the real deal.

If your check engine light is on due to a secondary air system fault, this might be your fix.

No UPC, just a genuine Mercedes part.