OE 1408690021 — Washer Pump for Mercedes-Benz

Three checks: the code printed on your old part must read 1408690021; the number must fall inside the build-year range in the Applications table; and the connector, thread or bolt pattern must match the reference photo. Codes cast into the housing are the most reliable source.

Treat it as a wear item: inspect every 20,000-30,000 km and replace at the first sign of leakage, noise or performance loss. Real service life swings widely with climate, road surface and duty cycle, so mileage on its own is a weak indicator.

Aftermarket washer pump comes from tooling houses that hold the original drawings or licensed equivalents. KingMay sources from vetted factories and inspects each batch; the manufacturer name is available on request where your market requires origin documentation.

Every shipment of 1408690021 leaves with a packing list, photo documentation and a QC report. Warranty terms are agreed per contract and reference that inspection record; claims are settled in writing against the documentation.

Build-year coverage is listed row by row in the Applications table above. Where several generations share one number, the newer rows usually carry a revised suffix — compare the last four characters before buying, since a suffix change often means a different connector or bracket.

A supersession happens when the maker revises a washer pump and issues a new tail number. The revision normally changes a small physical detail rather than the fit. Where we know a supersession chain for 1408690021 we list the current reference; ask our desk for written confirmation before a large order.