2.4L PHEV Engine Complete Assembly for 2021-2022 Mitsubishi Outlander
Product Notes Read before buying
This engine is for the 2.4L Plug-in Hybrid (PHEV) models only. It will NOT fit the standard gasoline-only models, which use a different 2.5L engine.
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| 2021 - 2022 |
Know This Engine Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this engine family:
A quick look at your own vehicle makes sure the right engine shows up:
- Verify the 8th digit of the VIN is 7.
- Confirm the vehicle is a PHEV (has a charging port door on the passenger-side rear fender and PHEV badges).
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Class 0 High-Voltage Insulated Safety Gloves (rated for 1,000V AC / 1,500V DC)
- CAT III/IV Digital Multimeter (rated for 1,000V)
- Engine Hoist & Load Leveler
- Bi-directional Scan Tool (Mitsubishi MUT-III SE or equivalent)
Budget for these consumables at install:
- Engine Oil (0W-20 fully synthetic, approx. 4.5 to 4.8 quarts)
- OE-spec Oil Filter
- Mitsubishi Super Long Life Coolant (SLLC) Blue (for both engine and hybrid inverter cooling loops)
- Spark Plugs (NGK Laser Iridium or equivalent, gap: 1.1mm / 0.044")
- Intake Manifold Gasket
- Exhaust Manifold Gasket
- Thermostat Gasket
- RTV Silicone Sealant (for oil pan)
- Accessory Drive Belt (Serpentine Belt)
- Torque-to-Yield (TTY) Flywheel/Flexplate and Cylinder Head Bolts (if removed)
What your vehicle’s computers will need after the swap:
What’s involved: Crankshaft Position (CKP) Sensor Relearn, PHEV ECU Synchronization, DTC Clearing & System Initialization
The engine control module (ECM) must be synchronized with the PHEV control unit, and a crankshaft position sensor relearn must be performed using a professional-grade bi-directional scan tool like the factory Mitsubishi MUT-III SE.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- High-Voltage De-energization (CRITICAL): Turn off ignition, remove high-voltage service plug under rear seat, wait 10 minutes, and verify 0V at inverter terminals with a CAT III/IV multimeter before starting work.
- Dual Cooling Loops: Refill and bleed both the engine and hybrid inverter cooling loops. The hybrid loop requires a scan tool to command the electric water pump to run and purge air.
- Solid Lifter Valve Adjustment: The 4B12 uses solid bucket lifters. Check and adjust valve clearances (intake: 0.20mm, exhaust: 0.30mm cold) while the engine is out.
- Torque Converter Seating: Ensure the torque converter is fully seated in the transmission pump before bolting the engine and transmission together to avoid destroying the pump.
- Crankshaft Position Sensor Damage: Remove the sensor before mating the engine and transmission to prevent crushing it, then reinstall it afterward.
Easy to get right once you know them:
- Ordering for a standard, non-hybrid 2022 Outlander (which uses a 2.5L Nissan-sourced engine) instead of the PHEV model.
- Ignoring the VIN code verification (8th digit must be 7).
- Reusing faulty or older-style ignition coils that suffer from terminal contact issues (TSB-22-16-001REV).
- Skipping the hybrid inverter coolant loop bleeding process, leading to immediate inverter overheating.
- Damaging the transmission pump by failing to properly seat the torque converter before installation.
- Hiring a general mechanic unqualified to work on high-voltage hybrid systems.
Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Replace ignition coils on all cylinders with updated countermeasure parts.
🔎 Recommended at install: Authorized dealers will replace the fuel pump assembly free of charge.
🔎 Recommended at install: Regularly inspect the timing chain tensioner and replace the chain when stretched.
🔎 Recommended at install: Use high-quality synthetic oil to prevent stuck oil control rings.
Researched from factory recalls, TSBs and OEM service data (reference unit 300-10771-5020979). Unit-specific details — mileage, condition, warranty, freight — are covered in the checkout interview.
Policies, in plain English.
Shipping & Handling
- Ships by LTL freight on a pallet — a real freight truck, not a parcel van
- Your checkout freight quote covers delivery to your door (liftgate service included for residential addresses)
- The carrier calls ahead to schedule a delivery window — someone must be present to receive it
- Typically palletized and picked up within 2–3 business days; transit time depends on distance
120-Day Warranty
This part includes a 120-day warranty.
- If the part fails within the warranty window, we'll replace it or refund per the coverage terms
- Coverage is parts-only — installation labor is not included
- Warranty covers defects — not installation errors, misuse, or damage after installation
Your pre-purchase interview reviews these exact terms with you before anything is charged.
Returns (30 Days)
We accept returns of uninstalled parts within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: This part ships by freight (LTL) — the part price is refundable per the terms above, but shipping costs are non-refundable and return freight follows the seller's return terms. Your pre-purchase interview walks through the exact numbers before you buy
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
Freight damage is rare — and you're fully protected when you do two things at delivery:
- Inspect before you sign — you're allowed time to look the pallet over while the driver waits
- Write any damage on the delivery receipt before signing — that one line is what makes a freight claim succeed
- Severe damage? Refuse the delivery — it goes back at no cost to you and we make it right
- Photograph the pallet before unwrapping; report concealed damage within 24 hours of delivery
We handle the carrier claim — you just help document it. Your pre-purchase interview walks through this checklist too.
Order Cancellation
Cancel before shipment for a full refund. Once the pallet has been built, a preparation charge may apply — and once the freight carrier picks it up, shipping costs are non-refundable and standard return terms apply. Your pre-purchase interview shows the exact numbers before you pay.
Expert Guides
2021-2022 Mitsubishi Outlander 2.4L 4B12 PHEV Engine: Problems, Identification, and Used Replacement
Identify the 4B12 hybrid engine, understand what causes it to fail, and learn when replacing it with a used OEM unit is the smartest choice.
Read Full Guide →Related Trouble Codes (OBD-II)
4 matching guidesIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
Mitsubishi: 1000D178, MU1000D178
Fits Years: 2021 2022
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This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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