Parts for your 2019 Mitsubishi Asx-Maf sensor

2019 Mitsubishi ASX MAF Sensor: What it does, where it is, and how to look after it

Based on technical references, the 2019 Mitsubishi ASX is fitted with a mass air flow (MAF) sensor. The Mitsubishi Motors ASX/RVR Workshop Manual (GA-series, Engine Electrical – Group 13A) specifies an “air flow sensor” mounted in the intake tract immediately downstream of the air cleaner, and includes diagnostic routines for DTCs P0100–P0104. Mitsubishi’s ASA parts catalogue for the 4B11 2.0‑litre petrol lists a serviceable MAF assembly, and common OE suppliers (DENSO hot‑film MAF type) document this application. That makes the MAF-sensor directly relevant to 2019 ASX servicing.

On the 2019 ASX, the MAF-sensor measures the amount of air heading into the engine so the ECU can nail the fuel mix, timing, and idle control. When it’s happy, the ASX feels crisp off the line, sips fuel sensibly, and keeps emissions in check. When it’s grumpy, you’ll often see a check engine light and notice doughy throttle response or higher-than-usual fuel use.

Under the bonnet, the MAF sits on the intake tube right by the airbox. It’s a delicate hot‑film element, so no poking it with a screwdriver. If the car lives on country roads or sees lots of building-site dust, a light clean every 40,000–60,000 km can help. Use a dedicated MAF cleaner only—no carb or brake cleaner—and let it dry fully before refitting. Keeping a good quality air filter in place (and avoiding heavily oiled filters) goes a long way toward preventing contamination.

Replacement is straightforward if needed. Unplug the connector, remove the two fasteners, lift the sensor straight out, and check the O‑ring. Fit the new unit squarely, nip the screws evenly, and make sure the intake clamps upstream and downstream are snug to prevent unmetered air leaks. Sticking with an OE-equivalent sensor from a reputable brand is worth it, cheap copies can cause chasing-your-tail drivability issues.

• Common symptoms of a crook MAF-sensor: rough idle, flat spots, poor economy, hard starts, and DTCs like P0101 or P0102.
• Good practice after cleaning or replacement: clear fuel trims with a scan tool, or disconnect the battery for a short period so the ECU can relearn. Then take it for a relaxed drive so trims settle.

Look after the MAF-sensor and the ASX’s 2.0‑litre runs sweeter, uses fewer litres per 100 km, and keeps that easygoing city-and-highway vibe drivers expect across Australia and New Zealand.

Popular questions about the 2019 Mitsubishi ASX MAF-sensor

Where is the MAF-sensor located on a 2019 ASX?
It’s mounted in the intake duct right after the air cleaner box. Pop the bonnet and follow the big black intake hose from the filter—there’s a small rectangular sensor body with a plug and two screws.

Can a dirty MAF cause high fuel use on the ASX?
Absolutely. If the sensor under-reports airflow, the ECU can get the mixture wrong, leading to sluggish response and higher consumption. A careful clean with MAF-safe spray often restores proper readings.

How often should the MAF be serviced or replaced?
There’s no strict replacement interval. Inspect it whenever the air filter is changed, and consider cleaning every 40,000–60,000 km in dusty conditions. Replace only if faulty, damaged, or if cleaning doesn’t resolve issues.