Parts for your 2021 Mitsubishi Asx-Map sensor

2021 Mitsubishi ASX MAP Sensor — What It Does and How to Look After It

Based on factory service information for the 2021 ASX/RVR (Outlander Sport) and mainstream parts catalogues used by Mitsubishi dealers, the 2021 Mitsubishi ASX is fitted with a Manifold Absolute Pressure (MAP) sensor on the intake manifold. The presence of manufacturer-defined OBD-II diagnostics such as P0106–P0108 for this model also confirms that the engine control module expects and uses a MAP signal.

On the 2021 ASX, the MAP sensor helps the engine computer work out how much air the engine is actually pulling in by measuring intake manifold pressure. That data, alongside throttle position and other inputs, lets the car fine-tune fuel delivery and ignition timing for smooth running, decent power, and better fuel economy. It also supports onboard diagnostics for things like EGR/EVAP checks and altitude compensation when you’re heading over the ranges.

It’s not a scheduled replacement item, but it does benefit from occasional attention. A quick look during routine servicing—every 10,000–15,000 kilometres or once a year—is smart. Under the bonnet, make sure the connector is snug and corrosion-free, and check that the sensor port isn’t gummed up with oil vapour or carbon. If the reading is suspect, a scan tool should show close to local barometric pressure with the key on/engine off, a long way off that figure points to a problem.

If symptoms crop up—rough idle, sluggish take-off, higher-than-usual fuel use, or a check engine light with a MAP-related fault—start with cleaning. Use an electronics-safe or MAF-safe cleaner and avoid poking the sensing element. If cleaning doesn’t stabilise readings, replacement is straightforward: disconnect the battery, unplug the connector, remove the fixing screws, swap in the new sensor with its seal, reconnect, then clear codes and allow the ECU to relearn at idle. Stick to quality OEM or reputable aftermarket parts so the calibration matches what the ECU expects.

A well-behaved MAP sensor keeps the ASX feeling crisp around town and steady on the open road. Keeping the intake tract sealed (no split hoses or loose clamps) and the PCV system healthy will also help the MAP sensor stay clean and accurate between services.

• Common signs of trouble: rough idle, hesitation, black exhaust smoke, poor economy, DTCs P0106–P0108.
• Quick check: compare key-on/engine-off MAP value to local barometric pressure on a scan tool.
• Service tip: clean gently, if readings remain erratic, replace and perform an idle relearn.

Popular questions

Where is the MAP sensor on a 2021 Mitsubishi ASX?
It’s mounted on the intake manifold, typically on the upper side near the throttle body. You’ll see a small, rectangular sensor with an electrical connector and a port that reads manifold pressure. Access is usually simple with basic hand tools.

What are the symptoms of a failing MAP sensor on an ASX?
Expect a rough or hunting idle, flat spots on acceleration, increased fuel use, and a check engine light. Scan tools often show MAP-related codes (P0106–P0108). Because vacuum leaks can mimic MAP faults, always check hoses and clamps before condemning the sensor.

Does the ASX use both a MAF and a MAP sensor?
Many ASX variants use a MAF for primary airflow measurement plus a MAP for load calculation support and diagnostics. The ECU blends these signals to keep fuelling accurate and to verify system integrity across different conditions and altitudes.