Parts for your 2012 Mitsubishi Lancer-Map sensor

2012 Mitsubishi Lancer MAP sensor: purpose, faults and servicing tips

Yes, the 2012 Mitsubishi Lancer is fitted with a MAP (manifold absolute pressure) sensor. On the naturally aspirated 2.0‑litre and 2.4‑litre 4B11/4B12 engines it’s used alongside the MAF to validate airflow, manage transient fuelling and monitor EGR operation, on turbocharged Ralliart and Evolution models it also doubles as a boost sensor. This is supported by Mitsubishi’s 2012 Lancer service manual (CJ/CF, Group 13A – Engine Electrical, Manifold Absolute Pressure Sensor and DTCs P0106–P0108) and the Mitsubishi ASA electronic parts catalogue entries listing a MAP sensor for CJ-series Lancer intake manifolds.

The MAP sensor measures the absolute pressure inside the intake manifold. The ECU blends that signal with intake air temperature and engine speed to infer air density and engine load. That helps sharpen throttle response, keep fuel trims tidy across changing altitudes, and spot faults like vacuum leaks. If the MAP value disagrees with the MAF, the ECU can throw a correlation code and go into a protective strategy to avoid running the mixture too lean or too rich.

Common symptoms of a crook MAP sensor on a 2012 Lancer include rough idle, flat spots on light throttle, poor fuel economy, pinging under load, hard starts, and fault codes such as P0106 (range/performance), P0107 (low), or P0108 (high). On turbo models you might also see over‑ or under‑boost behaviour.

Under the bonnet, the MAP sensor sits on the intake manifold near the throttle body (a small 3‑pin sensor sealed with an O‑ring). It’s solid-state and generally maintenance‑free, but a quick check at service time never hurts:

• Inspect the connector and loom for corrosion, chafing or oil wicking.
• If contaminated, remove and mist the tip with electronics/contact cleaner, let it dry fully.
• Check for manifold vacuum leaks that can mimic a MAP fault.

Replacement is straightforward: one fastener, swap the O‑ring, and refit. Don’t overtighten, nip it up with a small spanner or torque to spec if available. Use a quality OEM‑equivalent sensor to avoid flaky readings. After replacement, clear codes, reset fuel trims if needed, and take a short drive so the ECU can relearn. For most owners in Australia and New Zealand, checking the MAP sensor every 40–60,000 kilometres alongside the air filter and MAF clean is a sensible, low‑effort way to keep the Lancer running sweet.

Technical sources referenced: Mitsubishi Motors 2012 Lancer (CJ/CF) Service Manual – Group 13A Engine Electrical (MAP sensor description and DTC chart P0106–P0108), Mitsubishi ASA electronic parts catalogue – CJ Lancer intake manifold components, Ralliart/Evo X engine control overview noting “Boost (MAP) sensor”.

Popular questions

Does a 2012 Mitsubishi Lancer have a MAP sensor?
Yes. All 2012 Lancer models have a MAP sensor on the intake manifold. On the non‑turbo 2.0/2.4 it supports load calculations and diagnostics, on Ralliart/Evo it also reads boost. You’ll find it near the throttle body, secured with a single bolt and sealed by an O‑ring.

Can the MAP sensor be cleaned, or should it be replaced?
Light contamination can be cleaned with electronics/contact cleaner and a gentle spray—no brushing or poking the tip. If the sensor shows internal faults (e.g., persistent P0107/P0108, implausible readings in live data) it’s best to replace it with a quality part.

What fault codes point to a MAP sensor issue on a 2012 Lancer?
Typical MAP-related codes are P0106 (range/performance), P0107 (circuit low), and P0108 (circuit high). You may also see correlation faults like P0068 when MAP and MAF don’t agree. Always rule out vacuum leaks and wiring issues before condemning the sensor.