About this part
What it does. K And N Replacement Air Filter K&N 400-E-0638 keeps dust and debris out of the intake so the engine draws clean air.
Symptoms that point to this part
- Reduced fuel economy
- Sluggish acceleration
- Visibly dirty or clogged filter element
Service note. Typically inspected at every service and replaced roughly annually.
Fitment. Catalogued as fitting 2025 Mercedes-Benz Cla45 Amg S, 2021–2023 Mercedes-Benz Gla45 Amg, 2020–2022 Mercedes-Benz Cla45 Amg. Engine, sub-model and trim can narrow fitment further, so check those attributes on the listing before ordering.