Complete Guide: Mitsubishi Lancer Engine ECU 2003–2008 | MN156344 / E6T31099 | Genuine OEM Engine Control Unit

Introduction: About Automan Spare Parts

Welcome to www.automanspareparts.com, your trusted global supplier for Genuine OEM Engine Control Units (ECUs). We proudly hold the largest ECU inventory in the Philippines, offering cheapest OEM prices, high-quality tested units, and fast worldwide shipping to the USA, Mexico, UAE, Saudi Arabia, UK, Australia, and more.
If you're searching for a reliable Mitsubishi Lancer ECU for 2003–2008, this guide will help you understand everything before buying.

1. Overview of the Mitsubishi Lancer ECU MN156344 / E6T31099 (2003–2008)

The Mitsubishi Lancer ECU (Engine Control Unit) with part numbers MN156344 and E6T31099 is the primary computer that manages engine performance, fuel maps, ignition timing, emission control, airflow measurement, throttle response, and onboard diagnostics.

Main Part Numbers Covered

• MN156344

• E6T31099

• E6T31099 H1 / H2 (some production batches)

Supported Engines

• 4G18 1.6L Petrol

• Some trims with 4G15 1.5L may also use cross-compatible units.

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3. Key Features of the Genuine Mitsubishi Lancer ECU

• Fully compatible with Mitsubishi Lancer 2003, 2004, 2005, 2006, 2007, 2008

• Genuine OEM manufacturing (no clones or aftermarket units)

• Accurate fuel and ignition control

• Optimized for 4G18/4G15 engines

• Supports OBD-II diagnostic communication

• Ensures factory-level drivability and performance

• Long lifespan and durable internal circuitry

4. Common Symptoms of a Faulty Mitsubishi Lancer ECU

If your ECU is failing, you may experience:

• Hard starting or no start

• Rough idle or engine stalling

• Random misfires

• Poor fuel economy

• RPM instability

• Check Engine Light always on

• Throttle hesitation

• Failure to communicate with OBD scanner

If these symptoms appear, replacing the ECU with a genuine OEM unit is highly recommended.

5. Does the MN156344 / E6T31099 ECU Require Programming?

YES, the replacement ECU usually requires programming or immobilizer pairing.
This depends on:

1. Whether your vehicle uses an immobilizer

Most Mitsubishi Lancer 2003–2008 models DO.

2. Options when replacing the ECU

You have three choices:

A. Plug-and-Play (Pre-Programmed Set)

If you buy a full security set including:

• ECU

• Immobilizer ring

• Key chip

Then no programming is needed.

B. OEM ECU Only (Requires Programming)

A standalone ECU will require:

• Immobilizer coding

• VIN writing

• Key registration

Your local technician or dealership can program it.

C. Cloning Your Old ECU

A specialist can clone:

• EEPROM

• Immobilizer data

• VIN

• Maps

Then it becomes 100% plug-and-play.

6. Compatibility Table

Mitsubishi Lancer ECU MN156344 / E6T31099 Compatibility

7. Why Buy Your Mitsubishi ECU from Automan Spare Parts?

1. No.1 OEM ECU Supplier in the Philippines

We stock the largest collection of genuine ECUs in the country.

2. Cheapest Prices Globally

We provide unbeatable prices while maintaining OEM quality.

3. 100% Genuine & Tested ECUs

Every ECU is scanned, tested, and ready for installation.

4. Fast Worldwide Shipping

Shipping available to:

• USA

• Mexico

• UAE

• Saudi Arabia

• UK

• Qatar

• Australia

• Japan

• Malaysia

• And 70+ more countries

5. Professional Support Team

We help you confirm compatibility before you buy.

8. TLDR (Too Long; Didn’t Read)

• ECU Part Numbers: MN156344 / E6T31099

• Fits: Mitsubishi Lancer 2003–2008 (4G18/4G15 engines)

• Needs Programming? Yes, unless you buy a plug-and-play security set or request ECU cloning.

• Best Place to Buy: Automan Spare Parts – No.1 OEM ECU supplier in the Philippines

• Benefits: cheapest prices, verified OEM units, fast global shipping

9. FAQ – Mitsubishi Lancer ECU MN156344 / E6T31099

1. Is MN156344 the same as E6T31099?

Yes. MN156344 is the Mitsubishi part number, while E6T31099 is the Denso manufacturer code.

2. Does the ECU require programming?

Yes, in most cases programming or immobilizer pairing is required.

3. Can I install the ECU myself?

Physical installation is simple, but programming must be done by a technician.

4. Do you offer plug-and-play ECUs?

Yes. Automan Spare Parts can supply pre-programmed or security set plug-and-play options.

5. Is this ECU compatible with the 1.6L 4G18 engine?

Yes. This is the official OEM ECU for the 4G18 engine used in 2003–2008 Lancer models.

6. Do you ship internationally?

Yes, we ship worldwide with fast delivery.