Mitsubishi TD04HL Turbo Rebuild Service

PT Turbo rebuilds and remanufactures Mitsubishi TD04HL turbochargers in-house at our San Bernardino, CA shop. Every unit goes through a full teardown, OEM-spec or better parts replacement, CIMAT VSR balancing, and final quality inspection before it ships back — backed by a 12-month unlimited mileage warranty and nationwide mail-in service. Commonly found on Subaru Legacy GT / Forester XT.

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Common Mitsubishi TD04HL Part Numbers

The following part and SKU numbers from PT Turbo’s catalog match or cross-reference to the Mitsubishi TD04HL:

Don’t see your number? Contact PT Turbo — we’ve been matching turbo part numbers since 1978.

Trouble Codes Often Seen on Subaru Legacy GT / Forester XT Equipped with the Mitsubishi TD04HL

These are generic diagnostic trouble codes commonly associated with turbo boost control issues on this application. They’re triggered by the vehicle’s ECU, not the turbo itself, so confirm with a scan tool before assuming the turbocharger is at fault.

• P0299 — Turbocharger/Supercharger Boost Pressure – Low (underboost)
• P0234 — Turbocharger/Supercharger Overboost Condition

Also Known As

The TD04HL is the high-flow Mitsubishi unit Subaru owners search for under several different names.

• Mitsubishi TD04HL-15T / TD04HL-19T turbo
• Mitsubishi Subaru Legacy GT / Forester XT turbo
• TD04 high-flow turbocharger
• Mitsubishi TD04L Subaru turbo
• Subaru EJ255 / EJ257 factory TD04
• TD04HL turbo cartridge / CHRA

Vehicles We Commonly See With the Mitsubishi TD04HL

This TD04HL variant shows up almost exclusively on turbocharged Subaru platforms running the EJ-series flat-four.

Subaru Legacy GT

• 2005-2009 Legacy GT (EJ255)
• 2005-2009 Outback XT / Legacy GT spec.B
• Manual and 5EAT automatic equipped cars

Subaru Forester XT

• 2004-2008 Forester XT (EJ255)
• Both manual and automatic trim levels

Related Turbo Subaru Platforms

• 2006-2007 Impreza WRX (EJ255) with factory TD04 setup
• Baja Turbo (EJ255) applications

Common Mitsubishi TD04HL Failure Symptoms

• Blue or gray smoke under boost, especially after the turbo spools or on a long pull
• Blue smoke on startup or after idling, pointing to a leaking turbine-side oil seal
• Excessive shaft play, both side-to-side and in-and-out, when checked by hand
• High-pitched whine or grinding from the center cartridge as journal bearings wear
• Boost creep or overboost that trips a P0244 / overboost code
• Inconsistent or sluggish boost response from a sticky wastegate actuator
• Oil consumption with no external leak, usually drawn into the intake or exhaust
• Oily residue inside the charge pipe or intercooler inlet

Real Mitsubishi TD04HL Failures We See in Our Shop

• On the Mitsubishi TD04HL units we rebuild, the most common complaint is blue smoke under boost. The turbine-side oil seal gives up and oil gets pulled past it into the hot exhaust, so the smoke shows up worst when the car is loaded under throttle.
• We frequently see journal bearing wear on cars that ran extended oil change intervals. These EJ engines are hard on oil, and once the oil breaks down the bearings score and the shaft starts knocking out, which you can feel as in-and-out play in the cartridge.
• The factory wastegate actuator is a known weak point. The diaphragm and rod wear out, the spring rate softens, and the gate no longer holds its set point, which causes boost creep and overboost codes on stock cars.
• We also pull a lot of these turbos that were starved of oil from a clogged factory banjo bolt or restricted feed line. Coked oil at the supply fitting cooks the bearings and you end up with a unit that has both bearing damage and seal failure together.
• Compressor wheel rub from worn bearings is common on higher-mileage units. By the time the shaft plays enough to let the wheel kiss the housing, the contact marks tell us the bearings were gone long before the customer noticed.
• On cars driven hard and shut off hot, we see heat-soaked center sections with carbon buildup around the seals, which accelerates the oil-leak failure these TD04HL turbos are already prone to.

Preventing Future Mitsubishi TD04HL Failures

Most TD04HL failures we see come down to oil quality and heat management, and both are easy to stay ahead of.

• Change oil every 3,000 to 3,500 miles with a quality full synthetic, since these EJ engines and the TD04 bearings punish stretched intervals
• Let the turbo cool down for 30 to 60 seconds at idle after hard driving before shutting off, especially after highway pulls
• Let the engine reach operating temperature before getting on boost, so the bearings have full oil flow first
• Inspect and replace the factory oil feed banjo bolt and screen if it shows any coking or restriction
• Check the intake and charge piping for boost leaks that make the wastegate work harder
• Keep a clean air filter and verified intake tract so debris never reaches the compressor wheel
• Verify the wastegate actuator holds its set point and replace it at the first sign of boost creep

Common Mitsubishi TD04HL Upgrade Paths

Customers rebuilding a TD04HL often ask what can be improved while the unit is apart. The most common requests are upgraded compressor and turbine wheels for more airflow on the same frame, a 360-degree thrust bearing to handle higher boost and reduce the in-and-out wear these units are known for, and billet compressor wheels for added durability over the cast factory piece. For Forester XT owners who tow or run heat-soaked, the focus is usually on reliability upgrades like a stronger thrust setup and an upgraded wastegate actuator rather than chasing peak power. These paths are informational and depend on your goals, tuning, and supporting modifications.

Frequently Asked Questions

How to Identify Your Mitsubishi Turbo

The identification tag is typically located on the compressor housing, bearing housing, or center section of the turbocharger. It usually lists the model number, assembly number, and serial number. If you’re not sure which Mitsubishi model you have, send PT Turbo a photo of the tag and we’ll help identify it before you ship anything.

PT Turbo Warranty

• 12-month, unlimited mileage warranty against defects in parts and workmanship
• Final quality inspection on every rebuild: leak test, visual inspection, actuator or wastegate function check
• In-house CIMAT VSR balancing with a balance report included
• Nationwide mail-in service — you don’t need to be local

What the Mitsubishi TD04HL Rebuild May Include

• Complete teardown of all major components
• Ultrasonic or parts cleaning to remove carbon, oil residue, and contamination
• Journal bearing, thrust bearing, and seal replacement
• O-rings and hardware replacement
• Shaft and wheel inspection, with compressor or turbine wheel replacement if needed
• Wastegate inspection and actuator linkage service, when equipped
• CIMAT VSR balancing
• Final inspection

Why Customers Choose PT Turbo

• Rebuilding turbochargers, including Mitsubishi, since 1978
• In-house CIMAT VSR balancing on every unit, not outsourced
• Full housing sandblasting and OEM-spec or better parts replacement
• Inspect first, quote before work begins — no surprise charges
• Nationwide mail-in service from our San Bernardino, CA shop

PT Turbo Inspection Process

Every turbocharger goes through the same evaluation before any work begins:

1. Initial evaluationcompressor wheel, turbine wheel, shaft, bearing housing, VGT assembly (if equipped), actuator, and seal surfaces are checked first.
2. Complete disassemblythe turbocharger is fully torn down and every major component is inspected individually.
3. Cleaningcomponents are cleaned to remove carbon, oil residue, rust, and contamination.
4. Measurementcritical tolerances are measured against OEM specification.
5. Reassemblyrebuilt using new wear components matched to your specific model.
6. CIMAT VSR balancingthe rotating assembly is balanced in-house, with a balance report included.
7. Final inspectionleak test, visual inspection, and actuator or wastegate function check before shipment.

No work begins without your approval. You receive a quote after inspection, not before.

Pricing

Most rebuilds require inspection before final pricing. Standard rebuild pricing depends on the turbo model, parts availability, wheel condition, shaft condition, housing damage, and whether upgrades are requested. PT Turbo inspects every turbo and sends a quote before any work begins — no surprise charges.

Related Mitsubishi Models

Turbo Models That Fit the Mitsubishi TD04HL

• Mitsubishi TD04 Turbo Rebuild Service