Parts for your 2019 Subaru Impreza-Map sensor

2019 Subaru Impreza MAP sensor — what it does and how to look after it

Technical documentation confirms the 2019 Subaru Impreza is fitted with a MAP sensor. The Subaru factory service manual for the 2019MY Impreza (Engine Control System – Sensors) lists the Manifold Absolute Pressure (MAP) sensor and associated diagnostics, including DTCs P0106–P0108 (MAP/Baro Range/Performance, Low, High). Subaru parts catalogues for the FB20 engine also show a manifold-mounted MAP sensor. So yes — it’s relevant on this model.

On the 2019 Impreza, the MAP sensor measures the absolute pressure inside the intake manifold. The engine control module uses this reading alongside the MAF sensor to calculate engine load, adjust fuel delivery and ignition timing, and keep things running smoothly across different altitudes and temperatures. Even though the Impreza is naturally aspirated, the MAP sensor is crucial for quick throttle response, accurate transient fuelling, and reliable idle control.

Under the bonnet, the MAP sensor is typically bolted to the intake manifold with an O-ring seal and a single electrical connector. Because it lives where crankcase vapours and fine oil mist can pass, light contamination can occur over time. There’s no fixed replacement interval, but it’s smart to inspect it during major services (every 30,000–50,000 km) or whenever chasing drivability gremlins.

Common signs the MAP sensor needs attention include:

• Check Engine light with codes like P0106, P0107 or P0108
• Rough idle, hesitation, or flat spots on acceleration
• Increased fuel use and a whiff of rich running
• Hard starting or stalling when coming to a stop

Servicing tips for the MAP sensor on a 2019 Impreza:

• Before removal, disconnect the battery negative to avoid stored faults.
• Lift the engine cover, unplug the connector, remove the fixing screw(s), and withdraw the sensor straight out to protect the O-ring.
• If slightly dirty, mist the sensing port with electronics-safe cleaner. Don’t poke tools into the port or soak the sensor.
• Replace a flattened, brittle, or oil-swollen O-ring to prevent vacuum leaks.
• Refit and torque fasteners to Subaru spec, reconnect, then clear any codes and take a short drive so the ECU can relearn trims.
• Use a genuine or quality OEM-equivalent part, cheap copies can cause intermittent faults that are painful to diagnose.

Look after the air filter and PCV system as well — keeping oil vapour and dust down will help the MAP sensor stay happy for the long haul.

FAQs

Where is the MAP sensor on a 2019 Subaru Impreza?
It’s mounted on the intake manifold, secured with a small bolt and sealed by an O-ring, with a single electrical connector. Remove the engine cover for easier access.

Can the Impreza have both a MAF and a MAP sensor?
Yes. The 2019 Impreza’s ECU uses both. The MAF measures incoming air, while the MAP reads manifold pressure. Together they improve accuracy for fuelling, timing, and altitude compensation.

Is it safe to keep driving with a faulty MAP sensor?
The car may run, but it can use more fuel, feel sluggish, and trigger the Check Engine light. Prolonged driving risks fouling the catalytic converter. It’s best to diagnose and fix it promptly.