Parts for your 2020 Mazda 3-Map sensor

2020 Mazda 3 MAP Sensor (Intake Air Pressure Sensor)

Based on technical documentation, the 2020 Mazda 3 (BP) with SKYACTIV‑G 2.0 and 2.5 engines is fitted with a manifold absolute pressure sensor. Mazda labels it the Intake Air Pressure (IAP) sensor and mounts it on the intake manifold. This is detailed in the Mazda Workshop Manual for Mazda3 (BP, 2019–2021), Engine Control System – “Intake Air Pressure Sensor”, corroborated by Mazda Global Service Information (GSI) wiring diagrams showing the IAP sensor circuit, and reflected in Mazda’s DTC coverage for the model (P0106, P0107, P0108 for MAP/IAP performance and circuit faults). Those sources confirm the MAP/IAP sensor is relevant and used on the 2020 Mazda 3.

On this Mazda, the MAP (IAP) sensor helps the ECU understand how much air is actually making it into the manifold at any given moment. Working alongside the MAF, it fine‑tunes fuel delivery, spark timing and EGR operation, keeping the engine smooth, efficient and happy on Aussie and Kiwi roads. It also plays a big role in drivability—especially during quick throttle changes and at different altitudes—so if it’s not reading right, you’ll feel it.

There’s no set replacement interval for the MAP sensor, but it deserves a look during routine servicing (think every 20,000–40,000 km when you’re already under the bonnet for filters and plugs). A quick visual check for cracked wiring, loose connectors, or oil mist and dust build‑up around the sensor body goes a long way. If the car throws a check‑engine light with codes like P0106/P0107/P0108, runs rich, idles roughly, or feels doughy on acceleration, the MAP sensor is a usual suspect.

Replacement is straightforward: disconnect the battery, unplug the connector, remove the retaining fastener(s), and ease the sensor out of the manifold. Always inspect or replace the O‑ring so it seals properly on refit, and tighten to the factory torque. After installation, clear fault codes and take a short drive so the ECU can settle into its trims—no special programming is typically required. If the sensor is just a bit dirty, a gentle clean of the sensing port with electronics‑safe cleaner can restore readings, but avoid soaking or poking the element.

• Common symptoms of a dodgy MAP: rough idle, poor fuel economy, sluggish throttle, black smoke, or stalling after start.
• Pro tip: fix any vacuum leaks first—false air can mimic a bad MAP sensor.

These points align with Mazda’s own service literature for the BP series and the fault logic Mazda assigns to the MAP/IAP circuit, so owners and techs can service the part with confidence.

FAQs

Where is the MAP (IAP) sensor on a 2020 Mazda 3?
It’s mounted on the intake manifold, typically near the throttle body. Under the bonnet, look for a small, plug‑in sensor with a single O‑ring seal going straight into the manifold. Access is usually simple with basic hand tools.

Does a new MAP sensor need programming?
No special coding is usually required. Fit the new sensor, ensure the seal is good, clear any stored fault codes, and take the car for a short drive so the ECU can adapt its fuel trims.

How can they tell if the MAP sensor is failing?
Watch for a check‑engine light with P0106/P0107/P0108, uneven idle, heavy fuel use, or flat spots on acceleration. A scan tool will show manifold pressure readings, if they don’t change logically with throttle and load, the sensor or its wiring may be the issue.