Air Filter Gen-2 1.6 (PW811941)

The panel air filter for the 1.6 S4PH carries Proton number PW811941. Malaysian listings for this number name the Gen-2 and the S4PH Persona, and the same listing notes the CPS-era cars too, so confirm the housing shape before you buy a filter described only as “CamPro”.

The OSK A-7499 is the common aftermarket panel, sold with PW811941 as its OE reference for about RM14. It is a direct replacement and the frame seals correctly, which is the only thing that matters on a panel filter this simple.

Replace it at the service interval, or sooner if the car lives near construction dust. A dirty filter makes the S4PH’s low-rpm flat spot worse, which owners often blame on the engine rather than the filter.

Verified against a Malaysian parts listing for the OSK A-7499 panel filter naming the Gen-2 and S4PH, with PW811941 as the OE reference, checked 2026-10-26. Retailer listing, not a Proton EPC.