Mitsubishi TD04 Turbo Rebuild Service

PT Turbo rebuilds and remanufactures Mitsubishi TD04 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 / Volvo.

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Common Mitsubishi TD04 Part Numbers

The following part and SKU numbers from PT Turbo’s catalog match or cross-reference to the Mitsubishi TD04:

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

Trouble Codes Often Seen on Subaru / Volvo Equipped with the Mitsubishi TD04

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

Buyers searching for this turbo often use a few different names depending on their vehicle.

• Mitsubishi TD04 turbocharger
• Mitsubishi TD04L turbo
• Subaru TD04 turbo
• Volvo TD04 turbo
• TD04-13T / TD04-15T turbo
• Mitsubishi Subaru / Volvo turbo

Vehicles We Commonly See With the Mitsubishi TD04

The TD04 shows up across a wide range of Subaru and Volvo turbo applications that come through our shop.

Subaru Applications

• Subaru Legacy GT and Outback XT (2005-2009)
• Subaru Forester XT (2004-2008)
• Subaru WRX (early TD04-13T fitments)
• Subaru Baja Turbo (2004-2006)

Volvo Applications

• Volvo S40 and V40 1.9T (late 1990s to early 2000s)
• Volvo S60 and V70 light-pressure turbo models
• Volvo 850 turbo variants

Other Common Fitments

• Various TD04-13T and TD04-15T applications on 2.0L to 2.5L gas engines
• Light industrial and equipment use of the same frame size

Common Mitsubishi TD04 Failure Symptoms

• Blue smoke from the exhaust under boost or during hard acceleration
• Oil pooling or wetness in the compressor housing and intake piping
• Audible shaft play or a rattling sound when spooling
• High-pitched whine or siren noise that wasn’t there before
• Excessive in-and-out or radial play when you wiggle the shaft by hand
• Slow spool, soft boost, or boost that no longer holds peak
• Oil consumption with no visible external leak
• Visible nicks or contact marks on the compressor wheel blades

Real Mitsubishi TD04 Failures We See in Our Shop

• On the Mitsubishi TD04 units we rebuild, the number one complaint is blue smoke under boost. Almost every time it traces back to worn oil seals on the turbine and compressor sides letting oil past into the intake and exhaust streams.
• We frequently see journal bearing wear caused by stretched oil change intervals. These bearings depend on clean oil flow, and once the oil gets dirty or coked up the bearings wear oval and let the shaft float, which kills the seals next.
• Compressor wheel damage from poor air filtration is extremely common on these. A torn filter, an aftermarket intake with a loose connection, or just a neglected element lets grit through and chews the leading edges of the compressor blades.
• We catch a lot of coked oil in the center housing on TD04s that were shut down hot after spirited driving. The baked-on oil restricts the feed and accelerates bearing and seal wear.
• On the Subaru fitments especially, we see shaft play that owners ignore until the wheels make contact with the housings, turning a simple seal-and-bearing rebuild into a wheel replacement.

Preventing Future Mitsubishi TD04 Failures

A few consistent habits keep a freshly rebuilt TD04 alive for the long haul.

• Change oil and filter on a tight interval with the correct grade, especially on Subaru boxer engines that run the oil hard
• Let the turbo idle 30 to 60 seconds before shutdown after highway or hard driving to avoid oil coking in the center housing
• Allow a brief warm-up before getting into boost on a cold engine
• Inspect the air filter regularly and replace any torn or poorly sealing element to protect the compressor wheel
• Check all intake and boost piping clamps so unfiltered air or grit can’t bypass the filter
• Verify the oil feed line is clear and not partially blocked before reinstalling a rebuilt unit
• Watch for any blue smoke early so a seal issue gets addressed before it loads up the catalytic converter

Common Mitsubishi TD04 Upgrade Paths

Customers rebuilding a TD04 often ask what can be improved while the unit is apart. The most common requests are upgraded compressor wheels for slightly more airflow on the Subaru applications, billet compressor wheels for added strength over the cast originals, and upgraded thrust bearing setups for owners who push higher boost. Some buyers running heavier loads or extended highway duty simply want every wear part replaced with new high-quality components for maximum reliability rather than chasing more power. Any of these can be discussed against the specific TD04 frame and application you are running.

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 TD04 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.

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