Parts for your 2021 Subaru Xv-Map sensor

2021 Subaru XV MAP sensor: what it does, where it lives, and how to look after it

Yes, the 2021 Subaru XV uses a MAP (Manifold Absolute Pressure) sensor. Subaru’s own technical literature lists the MAP sensor as part of the FB-series engine management, with related diagnostic trouble codes P0106, P0107 and P0108 in the Engine (Diagnostics) section of the 2021 XV/Crosstrek service manual. Subaru’s parts catalog for the GT7/GT9 XV also lists a “Manifold Absolute Pressure Sensor” (common part numbers include 22012AA150/22012AA160), and FB-engine training material describes a combined MAF + MAP control strategy. These sources confirm the MAP sensor is fitted and active on the 2021 XV, including non‑turbo and e‑BOXER variants.

On the 2021 Subaru XV, the MAP sensor measures the absolute pressure inside the intake manifold. The engine control unit uses that pressure reading, alongside the MAF and throttle position, to figure out real-time engine load, trim fuel, manage ignition timing, and keep emissions in check. It also provides a barometric reference and backs up the MAF if airflow readings go off. The result is smoother drivability, better fuel economy, and reliable cold and hot starts across Aussie and Kiwi conditions.

For servicing, the MAP sensor isn’t a scheduled replacement item, but it deserves a quick health check whenever the air intake or throttle body is being inspected. On the XV it’s mounted on the plastic intake manifold near the throttle body, with a three‑pin plug. A faulty or contaminated sensor can cause rough idle, flat spots, higher fuel use, or a check‑engine light with codes like P0106/P0107/P0108.

• Inspection: confirm the electrical connector is snug, pins are clean, and the sensor port isn’t coked up with oil mist or carbon.
• Cleaning: if deposits are visible, remove the sensor and lightly mist the port area with electronics-safe cleaner. Don’t poke the diaphragm or blast with high-pressure air.
• Replacement: use an OEM-quality MAP sensor and a fresh O‑ring. Fit to the intake manifold and tighten to the factory torque spec. Clear any stored DTCs and perform an idle relearn (warm engine, no loads, allow to idle for several minutes) or use a scan tool to reset learned values.

Owners who do a lot of short trips, dusty gravel roads, or tow in hot weather may want the MAP checked a bit more often. Keeping the air filter fresh and the PCV system tidy also reduces the chance of contamination reaching the sensor. When the MAP and MAF agree and the intake is clean, the XV’s FB engine runs sweet as—smooth pull, tidy fuel figures, and fewer surprises under the bonnet.

Common symptoms of a dodgy MAP on an XV

• Rough or hunting idle, hesitation on tip‑in, or sluggish climbing
• Noticeable jump in fuel consumption
• Check‑engine light with P0106, P0107, or P0108

FAQs

Where is the MAP sensor on a 2021 Subaru XV?
It’s mounted on the top or side of the plastic intake manifold, close to the throttle body, with a three‑pin connector and a single retaining screw. Access is straightforward with basic hand tools, just let the engine cool and disconnect the battery if removing it.

Can the MAP sensor be cleaned, or should it just be replaced?
Light contamination can often be cleaned with an electronics‑safe spray and gentle technique. If fault codes return, readings are erratic, or the diaphragm has been damaged, replacement is the go. Stick with OEM‑quality parts, fit a new O‑ring, and clear the codes before an idle relearn.

Does the XV have both a MAF and a MAP sensor?
Yes. The XV’s FB engine uses a MAF for primary airflow measurement and a MAP for manifold pressure/load, barometric reference, diagnostics, and backup. If one goes out of range, the ECU can fall back on the other to keep the engine running, though performance may be limited until repairs are done.