MAT & MAP Sensor | Volvo 3859020 MAT & MAP Sensor Volvo | 3859020 Combination sensor monitors both the intake temperature and the manifold absolute pressure. Volvo Penta MAT & MAP Sensor Intake temperature and manifold absolute pressure sensor Replaces Mercruiser 8M0087834 and 885165 Replaces Crusader R020039 Replaces PCM R020039 Replaces Marine Power 462717 Original Volvo Penta