Parts for your 2011 Subaru Impreza-Map sensor

2011 Subaru Impreza MAP sensor — what it does and how to look after it

Yes, the 2011 Subaru Impreza is fitted with a MAP (manifold absolute pressure) sensor. This is documented in Subaru’s Factory Service Manual for the 2011 Impreza engine control system and reflected in Subaru parts catalogues and Denso’s OE listings for the model range (2.5i, WRX, and STI). On naturally aspirated models it’s mounted on the intake manifold under the bonnet, on turbo variants it’s also a key input for boost control.

The MAP sensor measures the pressure inside the intake manifold. The engine control module uses that reading, along with signals from the MAF, throttle position, intake air temperature and O2 sensors, to work out engine load and deliver the right mix of fuel and ignition timing. On WRX and STI models, MAP data is also used to manage boost and protect the engine under high load. If it goes out of range, you’ll often see fault codes like P0106–P0108 and experience rough idle, flat spots, poor fuel economy, or over/under-boost on turbo cars.

There’s no set replacement interval for a MAP sensor, they generally last many years. As part of routine servicing, it’s worth a quick visual once-over:

• Check the electrical connector for corrosion, loose pins, or broken clips.
• Inspect the O-ring and the sensor port for oil mist and carbon build-up.
• Chase any vacuum leaks or split hoses on or near the intake manifold.

If cleaning is needed, remove the sensor with the engine off, keep debris out of the manifold, and give the sensing port a light spray with electronics-safe cleaner. Don’t poke anything into the port and don’t soak it. Refit with an intact O-ring and reconnect firmly. After replacement or cleaning, clearing codes and performing a short idle relearn helps the ECU settle.

When replacing, choose OE-spec parts from reputable suppliers, the wrong calibration can throw fuelling out, and on turbo models it can upset boost control. If drivability issues persist after addressing the MAP sensor, check for intake leaks, dirty throttle bodies, or MAF issues, as the Impreza’s ECU cross-checks multiple sensors to keep things tidy.

Popular questions about the 2011 Subaru Impreza MAP sensor

Where is the MAP sensor located on a 2011 Impreza?
It’s mounted on the intake manifold. On most 2.5i models it sits near the throttle body, on WRX/STI it’s also on the manifold, easy to spot with a small electrical connector and single retaining bolt.

Does the 2011 Impreza use both a MAF and a MAP sensor?
Yes. Subaru uses a MAF for primary airflow measurement and a MAP for manifold pressure/load calculations and diagnostics. Turbo models additionally rely on the MAP for boost control and engine protection strategies.

How often should the MAP sensor be serviced or replaced?
There’s no fixed interval. Include a quick inspection during regular servicing, clean only if contaminated, and replace if it throws repeated pressure/voltage fault codes or live data is clearly out of spec.