Parts for your 2019 Mazda 3-Map sensor

2019 Mazda 3 map-sensor: what it does, where it lives, and how to look after it

Yes, the 2019 Mazda 3 (BP) does use a manifold absolute pressure (MAP) sensor. Technical references that confirm fitment include the Mazda BP Workshop Manual (Engine Control System and Intake-Air System sections, which identify the MAP sensor on the intake manifold), Mazda’s Electronic Parts Catalogue for BP-series Mazda 3 (which lists a manifold absolute pressure sensor for Skyactiv-G/Skyactiv-X engines), and Mazda’s OBD-II diagnostics for BP, which include MAP-related DTCs such as P0106–P0108. These sources collectively show the MAP sensor is a standard part on the BP-platform Mazda 3.

On the 2019 Mazda 3, the MAP sensor reads the absolute pressure inside the intake manifold. The engine control unit blends that signal with inputs from the MAF, throttle position, intake air temperature and crank sensors to nail fuelling and ignition timing. It’s also used for idle stability, EGR control, and quick transient response when the driver jumps on the throttle. On Skyactiv-X, it further supports lean-burn and combustion control strategies. In short, it’s a small component that helps the car feel crisp and economical around town and on the open road.

There’s no fixed replacement interval for a map-sensor on this model, but it’s smart to give it some attention during regular servicing—especially if the vehicle racks up lots of short trips or sees dusty conditions. Under the bonnet it’s typically mounted on the intake manifold with a single fastener and an O-ring seal. If drivability goes off (think doughy throttle, rough idle, higher fuel use) or the check engine light throws a P0106/P0107/P0108, inspect the sensor and its wiring before replacing.

• Check for split vacuum hoses or intake leaks that can mimic sensor faults.
• Make sure the connector is clean, pins are tight, and the harness isn’t chafed.
• If oil mist from the PCV system has contaminated the port, carefully clean the port and sensor tip with appropriate electronics-safe cleaner (avoid soaking).
• When fitting a new sensor, use a fresh O-ring, seat it square, and don’t over-tighten.
• Clear codes, then road test to let trims settle, a short adaptive drive cycle helps.

A quick visual check every 40,000–60,000 kilometres during a major service is a solid habit. Keeping the intake system airtight and the PCV system healthy goes a long way to ensuring the MAP sensor keeps doing its job without drama.

Popular questions about 2019 Mazda 3 map-sensor

Does the 2019 Mazda 3 have both a MAF and a MAP sensor?
Yes. The BP-series Mazda 3 uses a MAF sensor for primary airflow measurement and a MAP sensor for manifold pressure/load, transient response, and diagnostics. The ECU blends both for accurate fuelling and timing across conditions.

Where is the MAP sensor on a 2019 Mazda 3?
It’s mounted on the intake manifold under the bonnet, secured with a single bolt/screw and sealed by an O-ring. You’ll see a small two- or three-pin connector on the sensor body and a short snout into the manifold.

Can a faulty or dirty MAP sensor cause high fuel use?
It can. If the MAP reading is skewed by contamination, wiring issues, or sensor failure, the ECU may enrich the mixture, hurting economy and drivability. Always rule out intake leaks first, then verify the sensor signal before replacing.