Parts for your 2015 Subaru Impreza-Map sensor

2015 Subaru Impreza MAP sensor

Yes, the 2015 Subaru Impreza is fitted with a MAP (Manifold Absolute Pressure) sensor. Technical sources that confirm this include Subaru’s Factory Service Manual for the 2015MY Impreza (GP/GJ) where the MAP sensor is listed as an ECM input and is covered under diagnostic items P0106–P0108, Subaru’s parts catalogue which lists an Intake Manifold Pressure (MAP) sensor for the FB20 engine, and Subaru’s OBD-II fault code documentation that references MAP/Baro circuit performance for this model. So it’s very much relevant on the 2015 Impreza.

The MAP sensor’s job is to measure the absolute pressure inside the intake manifold. On the FB20, the ECM uses it alongside the MAF to fine‑tune fuelling and ignition, manage EGR flow, and keep things tidy under changing loads and altitudes. That means smoother take‑offs, stable idle, and better economy on a long run. It also serves as a fallback load input if the MAF reading goes off, so reliability of this little sensor matters.

As part of routine servicing, the MAP sensor isn’t a scheduled replacement item, but it’s smart to give it a once‑over. Under the bonnet, it’s mounted directly to the intake manifold with an O‑ring seal and a single fastener, with a 3‑pin connector. Over time, oil mist or EGR deposits can build up in the port and skew readings.

• Visual check: make sure the connector is snug, wiring isn’t chafed, and the sensor body isn’t cracked.
• Clean carefully: if deposits are visible, remove the sensor and gently clean the port with electronics‑safe or MAF‑safe cleaner. Don’t poke the sensing element and don’t blast it with high pressure air.
• Seal health: inspect the O‑ring, replace if flattened, brittle or torn to prevent leaks.
• Refit right: reinstall and tighten to factory spec, then clear any codes and perform an idle relearn if required by your scan tool.

Common warning signs of a crook MAP sensor on this Impreza include rough idle, sluggish response, higher fuel use, black soot at the tailpipe, and the check engine light with codes like P0106/P0107/P0108. If these show up, test live data (key on/engine off should read close to local barometric pressure) and replace the sensor if out of spec. Quality OEM‑equivalent parts are recommended for consistent results.

Where is the MAP sensor on a 2015 Subaru Impreza?

On FB20‑equipped 2015 Imprezas, it’s mounted on the intake manifold near the throttle body, held by a single bolt and sealed with an O‑ring. Access is straightforward once the engine cover is off.

What are the symptoms of a bad MAP sensor on this model?

Expect rough idle, flat spots on acceleration, higher fuel consumption, harder cold starts, and a check engine light. Scan tools often show DTCs P0106–P0108, and live data may read implausible manifold pressure.

Does the 2015 Impreza use both MAF and MAP?

Yes. The MAF is the primary load sensor, while the MAP tracks manifold pressure for transient fuelling, EGR control and altitude compensation, and provides a fallback strategy if the MAF data isn’t reliable.