O2 Sensor for Mercruiser, Volvo Penta, PCM Engines Used on 3.0L, 4.3L, 5.0L, 5.7L, 6.2L, 8.1 MPI Engines PCM: HO303, EX343, ZR409, ZR450, XS550 Replaces Mercruiser: 8M2003959 Replaces Volvo Penta: 3883724 Made in USA RM24006.
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