Parts for your 2022 Subaru Impreza-Map sensor

2022 Subaru Impreza MAP sensor – what it does and how to look after it

Technical sources including the Subaru factory service manual for the GK/GT Impreza (MY2017–2022, FB20 engine) and Subaru engine performance training materials confirm the 2022 Subaru Impreza is fitted with a Manifold Absolute Pressure (MAP) sensor. The manual lists diagnostics for MAP-related DTCs (P0105–P0108) and outlines test voltages, making it clear this sensor is part of the engine management on all 2.0‑litre FB20 variants.

On a 2022 Impreza, the MAP sensor works alongside the MAF. Mounted on the intake manifold near the throttle body, it reads the actual pressure inside the manifold so the ECU can calculate engine load, trim fuelling, manage ignition timing, and compensate for altitude. It’s also used for on-board diagnostics of the intake system and EGR flow on applicable markets. When it plays up, the car can feel doughy off the line, idle roughly, drink more fuel, or light the check engine lamp.

There’s no fixed service interval for a MAP sensor, but it deserves a look whenever the bonnet’s up for scheduled servicing. Oil vapour and carbon mist can film over the sensor’s port. If readings are suspect or codes appear, check live data before replacing. A healthy sensor will usually show near-ambient kPa with the key on/engine off, and a clear drop at idle.

• Inspection tips: verify the connector is clean and latched, look for harness rub-through, and make sure the sensor’s O-ring isn’t nicked.
• Cleaning: if lightly contaminated, a quick spritz with electronics-safe cleaner (not throttle body or brake cleaner) can help. Let it dry fully.
• Replacement: it’s a straightforward remove-and-refit with one small bolt. Use a new O-ring, lightly oil it, seat the sensor squarely, and snug the bolt to factory spec—don’t overtighten.
• Aftercare: clear codes and confirm stable MAP readings and fuel trims on a short road test.

Common signs it’s time to act include hard starting, surging at cruise, poor economy, or MAP-related DTCs. Because the Impreza uses both MAF and MAP, faults can overlap—so a quick scan and a couple of basic checks will save guesswork and keep the FB20 running sweet as.

Popular questions

Does the 2022 Subaru Impreza have a MAP sensor or only a MAF?
Yes, it has both. Factory documentation for the FB20 engine specifies a MAP sensor on the intake manifold used for load calculation, altitude compensation, and diagnostics, working in tandem with the MAF.

Where is the MAP sensor on a 2022 Impreza?
It’s mounted on the intake manifold near the throttle body. Look for a small black sensor with a single retaining bolt and a three‑pin connector. Access is straightforward with basic hand tools.

Can the MAP sensor be cleaned, or should it be replaced?
Light contamination can sometimes be cleaned with electronics-safe cleaner. If the sensor is cracked, oil-soaked internally, or readings remain erratic after cleaning and harness checks, replacement is the reliable fix.