Parts for your 2009 Mitsubishi Lancer-Map sensor

2009 Mitsubishi Lancer MAP sensor: is it fitted and does it matter?

For 2009 Mitsubishi Lancer models sold in Australia and New Zealand with the naturally aspirated 4B1-series engines (CJ chassis), a separate MAP (manifold absolute pressure) sensor is not fitted. These models run a MAF-based engine management strategy with an intake air mass sensor on the airbox, while barometric pressure is measured inside the ECU. The turbocharged Ralliart (CY4A) and Evolution (CZ4A) variants do use a dedicated MAP sensor on the intake manifold.

That’s why parts listings can look a bit confusing: some show a “MAP sensor” for “2009 Lancer”, but the part actually applies to the Ralliart/Evo turbo cars, not the regular petrol CJ Lancer. For the non‑turbo cars, there’s simply no MAP sensor to replace. Instead, the ECU calculates engine load primarily from the MAF reading, throttle angle and engine speed, which works a treat on a naturally aspirated setup and keeps cost and complexity down.

Owners chasing rough idle, flat spots or poor fuel economy on a non‑turbo 2009 Lancer are usually better off checking the MAF sensor (clean with proper MAF cleaner), the throttle body, vacuum hoses and intake ducting for leaks, rather than hunting for a MAP sensor that isn’t there. If the car is a Ralliart or Evo, then yes—there’s a MAP sensor on the manifold that’s critical for boost control and load calculation, and it should be inspected if there are boost or fuelling issues.

Technical sources referenced:

• Mitsubishi Motors Service Manual, Lancer CJ (2008–2010), Engine Electrical – MPI: Sensor list shows MAF on naturally aspirated 4B11/4B12, separate MAP applied to turbo 4B11T applications.
• Mitsubishi ASA/EPC parts catalogue for CJ Lancer (MY2009): MAP sensor part numbers allocated to CY4A/CZ4A turbo models, not to CJ non‑turbo trims.
• Haynes Repair Manual Mitsubishi Lancer 2007–2017 (No. 5914), Fuel and Emissions: non‑turbo models described as MAF-based, MAP sensor coverage noted for turbo variants.

Popular questions about the 2009 Mitsubishi Lancer MAP sensor

Does a 2009 Mitsubishi Lancer have a MAP sensor?
On non‑turbo CJ Lancers, no—there’s no separate MAP sensor. The turbocharged Ralliart and Evolution models do have a MAP sensor on the intake manifold.

Where is the MAP sensor located on a 2009 Lancer?
Non‑turbo CJ models don’t have one. On Ralliart/Evo, it’s mounted on the intake manifold near the throttle body, a small 3‑pin sensor secured with screws.

What should be serviced if there’s no MAP sensor?
For non‑turbo cars, keep the MAF sensor clean, check the intake ducting and vacuum lines for leaks, and ensure the throttle body and PCV system are in good nick. For Ralliart/Evo, the MAP sensor port should be kept free of oil mist and carbon, replace the sensor if it throws plausibility codes or shows slow response.