Parts for your 2013 Subaru Impreza-Map sensor

2013 Subaru Impreza MAP sensor — what it does and how to look after it

Based on technical sources — including Subaru’s FB20 engine service manual, factory wiring/diagnostic charts listing DTCs P0105–P0108, and OE/aftermarket parts catalogues — the 2013 Subaru Impreza is fitted with a Manifold Absolute Pressure (MAP) sensor mounted on the intake manifold. So yes, it’s relevant on this model and plays a key role in how the engine runs.

The MAP sensor measures the absolute pressure inside the intake manifold. The Impreza’s ECU uses that reading alongside the MAF and throttle position to calculate engine load, fine-tune fuel delivery, and adjust ignition timing and AVCS (variable valve timing). It also helps the car cope with changing altitude and gives the ECU a backup path if the MAF reading goes out of whack. When the sensor is healthy, the engine starts cleanly, pulls smoothly through the rev range, and sips fuel as it should.

It isn’t a regular replacement item, but it’s smart to give it a look during major services (around 100,000 km or if drivability changes). Oil mist from the PCV system can occasionally leave residue on the sensing port. If inspection shows contamination, remove the sensor, keep the O-ring safe, and clean the port gently with an electronics-safe sensor cleaner. Let it dry fully before refitting. Avoid poking the sensing hole or using harsh solvents that can damage the diaphragm.

Common signs the MAP sensor needs attention include:

• Lazy throttle response, rough idle, or stalling at lights
• Poor fuel economy and higher-than-normal emissions
• Check Engine Light with codes like P0105, P0106, P0107, P0108 or MAF/MAP correlation faults

Replacement is straightforward: switch the ignition off, disconnect the plug, undo the retaining bolt, lift the sensor straight out, and swap the O-ring if it’s flattened or brittle. Refit and tighten the fastener snugly to spec (don’t overdo it on the plastic manifold), reconnect the plug, and clear any codes. If issues persist, check for intake leaks, brittle PCV hoses, or a clogged air filter — these can mimic a dodgy MAP reading.

For preventative care, keep the intake tract sealed, maintain the PCV system, and use quality filters. Do that and the Impreza’s MAP sensor will quietly get on with the job, no dramas.

Popular questions about the 2013 Subaru Impreza MAP sensor

Where is the MAP sensor on a 2013 Impreza?
It’s mounted on the upper side of the plastic intake manifold, near the throttle body. You’ll spot a small rectangular sensor with a single electrical connector and a single retaining bolt, sealed by an O-ring.

Can a dirty MAP sensor be cleaned, or should it be replaced?
If the sensor is just oily, a careful clean with electronics-safe sensor cleaner can restore proper readings. Let it dry completely before refitting. If the housing is cracked, the O-ring won’t seal, or scan data shows implausible pressure, replacement is the safer bet.

What fault codes point to a MAP sensor issue?
Expect codes like P0105 (MAP circuit range/performance), P0106 (MAP range), P0107 (low input), P0108 (high input), and sometimes MAF/MAP correlation faults. Always verify with live data and check for vacuum or intake leaks before calling the sensor bad.