Skip to content
KickTyres
Mercedes-Benz1997–2015 Critical issues documented

Mercedes-Benz ML W164: common faults & what to check

The W164 is the Mercedes-Benz ML built 2005–2012. Of the 10 faults documented for the ML, 5 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

Check this exact Mercedes-Benz ML

  • Odometer history
  • Money owing
  • Reported stolen
  • Ownership history
  • Official NZ vehicle register data
  • NZ owned and operated

Type the plate for the free basics. The full record is a paid check from $13.49, one car at a time, no subscription.

No NZ plate yet, or buying in Australia? Pick the generation and engine and start a free check below. New to KickTyres? How the check works →

10

Documented faults

Critical

Most serious

$800–$4,000

Typical repair

5

Systems covered

You're looking at the W164

Everything below is narrowed to this variant. Pick a different one to change it.

Choose a different generation

Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

Which engine is in it? These cover every year of this model.

ML250ML300ML320ML350ML500ML63

A 2007 Mercedes-Benz ML is the W164 generation (2005 to 2012).

We cannot narrow the engine list to this year, so every engine this model was sold with is offered.

Start your free check on this Mercedes-Benz ML

No plate needed. You get the risk score, the buyer's checklist and the guided inspection for the exact car you picked above — not the whole nameplate.

Mercedes-Benz ML W164Engine not picked yet

Pick the engine above first: the ML came with 6, and without it the report has to show all of their faults. Pick the engine

Free. The paid plate check is separate, and stays optional.

Can't confirm for this car

Mercedes-Benz ML · 2007

Narrowed to the year. No engine is recorded for this vehicle. Pick an engine to see which faults apply.

Tell us the engine, or check the engine code on the car, before relying on this.

  • No engine is recorded for this vehicle.

matched on year only

What to look out for

The checks worth doing on a Mercedes-Benz ML before you hand over any money. Every documented fault is listed below, each with its own page.

  • Costly issue

    Park on level ground overnight and check all four corners for sag in the morning.

    See why

    Airmatic Air Suspension Strut Leak and Compressor Failure

    The W164 Airmatic system is prone to air spring and strut leaks at the upper crimp rings and top seals as rubber perishes with age. The compressor runs excessively to compensate for leaking struts and eventually burns out, often blowing the 40-amp Airmatic fuse. Valve block solenoids also develop internal leaks. Ride height sensor rods become brittle and snap, causing persistent ride height fault messages.

    What you would notice

    • Vehicle sagging at one or more corners after sitting overnight
    • Airmatic malfunction warning on instrument cluster
    • Audible compressor running continuously or repeatedly
    • Uneven ride height or excessively harsh ride

    Typically $1,500–$6,500 to put right.

See all 5 issues for this oneDocumented for the exact year and engine you picked, including 1 rated critical.
Body, brakes, suspension & interior1

01Airmatic Air Suspension Strut Leak and Compressor Failure

Park on level ground overnight and check all four corners for sag in the morning.2005–2011SuspensionRead the full fault: symptoms, where to look, what to ask the seller
Depends on the exact engine — 4 moreDocumented for a specific engine we could not confirm from what you picked. Check the engine code on the car.
Engine, transmission & cooling3

01M272/M273 Balance Shaft Sprocket Premature Wear

Check engine serial number against the Mercedes published threshold (below 30468993 on M272).petrol2005–2007EngineRead the full fault: symptoms, where to look, what to ask the seller

02OM642 Intake Swirl Flap Plastic Linkage Failure

Scan for P2015 fault code before purchase.diesel2005–2011Engine
Very commonEngine $650–$2,500 to fix

Can't confirm for this car

The OM642 3.0-litre V6 diesel uses plastic actuator linkage rods to control intake manifold swirl flaps. The plastic degrades under heat cycling and breaks, or the swirl flap motor (M55) burns out after EGR carbon buildup stiffens the flap shafts. A failed motor can also drop metal debris into the intake ports, posing risk of engine damage. The failure triggers DTC P2015.

Symptoms to notice

  • Check engine light with P2015 fault code
  • Power loss and hesitation under acceleration
  • Rough idle especially when cold
  • Excessive black smoke on load

What to check

  1. Scan for P2015 fault code before purchase.
  2. Physically inspect the swirl flap actuator rod on the driver's side of the intake manifold for cracks or breakage.
  3. Check the swirl flap motor connector for oil contamination from the turbo inlet seal located directly above it.
  4. Inspect EGR passages for carbon buildup restricting flap movement.

Where to look: Intake manifold, driver's side of engine

Parts involved: Intake manifold.

Ask the seller

  • “Has the swirl flap linkage been repaired or replaced with an aftermarket metal kit?”
  • “Are there any stored fault codes, particularly P2015?”
  • “Has the EGR system been cleaned or deleted?”

037G-Tronic (722.9) Conductor Plate and Valve Body Failure

Scan for transmission fault codes before purchase.2005–2011Transmission
CommonTransmission $2,500–$6,000 to fix

Can't confirm for this car

The 722.9 seven-speed automatic transmission uses a solenoid conductor plate embedded in the valve body that is prone to internal failure, particularly on early VGS1-coded units fitted from 2005–2008. Extended service intervals with degraded transmission fluid accelerate solenoid wear. Both the conductor plate and valve body may require replacement together for a lasting repair.

Symptoms to notice

  • Harsh jolt or hesitation on 1-2 upshift
  • Transmission stuck in second gear (limp home mode)
  • Delayed engagement from park or reverse
  • Transmission warning light or fault codes

What to check

  1. Scan for transmission fault codes before purchase.
  2. Check transmission fluid condition and colour — brown or black fluid indicates neglected servicing.
  3. Confirm whether the transmission unit is coded VGS1 or VGS2 (VGS1 on early W164 has the higher failure rate).
  4. Test drive and pay close attention to the 1-2 shift quality.
  5. Ask for documented transmission fluid change history.

Where to look: Transmission unit, underfloor centre

Parts involved: Mechatronic / valve body.

Ask the seller

  • “Has the transmission fluid been changed at Mercedes-specified intervals?”
  • “Has the conductor plate or valve body been replaced?”
  • “Has the vehicle ever entered transmission limp mode?”
Fluid leaks1

01OM642 Oil Cooler Rubber Seal Degradation

Inspect the engine valley between the two cylinder banks for oil residue.diesel2005–2011Fluid LeaksRead the full fault: symptoms, where to look, what to ask the seller
Other Mercedes-Benz ML engines and years5 documented issues that do not apply to the one you picked.
Engine, transmission & cooling3

01W163 Transfer Case Internal Wear and Seal Leaks

Inspect beneath the vehicle for oil staining at the transfer case front and rear output seals.1997–2005Transmission
CommonTransmission $2,500–$6,500 to fix

Does not apply

The W163 four-wheel-drive transfer case is prone to internal chain stretch and bearing wear, accelerated by neglected fluid changes. Front and rear output shaft seals are also known to leak, causing oil loss that accelerates internal wear. When the transfer case chain fails, complete replacement is typically necessary. Low-range transfer case motor actuator failure is also documented on W163.

Symptoms to notice

  • Vibration or shudder at highway speeds
  • Clunking or grinding when engaging 4WD modes
  • Oil puddle visible beneath transfer case
  • Difficulty switching between 2H, 4H, and 4L

What to check

  1. Inspect beneath the vehicle for oil staining at the transfer case front and rear output seals.
  2. Check transfer case fluid level and condition.
  3. Test all 4WD mode transitions smoothly including low range.
  4. Listen for chain whine or clunking during mode changes.
  5. Request documented transfer case fluid service history.

Where to look: Transfer case, directly behind the transmission

Parts involved: Transfer case.

Ask the seller

  • “Has the transfer case fluid ever been changed?”
  • “Does 4WD engage and disengage smoothly in all modes?”
  • “Are there any oil leaks beneath the transfer case?”

02OM612 Diesel Injector Coking and Turbo Wastegate Sticking

Scan for injector-related fault codes.diesel2000–2005Engine
CommonEngine $800–$4,000 to fix

Does not apply

The OM612 2.7-litre five-cylinder diesel (ML270 CDI) is prone to injector nozzle coking from carbon deposits, which distorts the spray pattern and causes rough running. The turbocharger wastegate actuator rod also sticks due to heat and corrosion, preventing proper boost regulation. Both issues are worsened by short-trip urban use and extended service intervals with low-quality fuel.

A single common-rail diesel fuel injector photographed against a plain background.Example of the part — not this vehicle

A common-rail diesel injector. Contamination damages the nozzle at the tip.

Panoha · CC BY-SA 3.0 · Wikimedia Commons

Symptoms to notice

  • Rough or uneven idle, especially when cold
  • Black smoke under acceleration
  • Power loss and excessive turbo lag
  • Difficult cold starting

What to check

  1. Scan for injector-related fault codes.
  2. Drive under load and observe for black smoke.
  3. Test turbo boost by checking for wastegate actuator rod freedom of movement — corrosion causes it to seize at one end of travel.
  4. Ask about injector service history and fuel quality used.
  5. If a workshop inspection is possible: Perform a compression test to distinguish injector issues from other diesel faults.

Where to look: Fuel injectors on cylinder head; wastegate on turbocharger exhaust side

Parts involved: Turbocharger, Fuel injector.

Ask the seller

  • “Have the injectors been cleaned or replaced?”
  • “Has the turbocharger wastegate actuator been serviced or freed?”
  • “Is there any smoke visible on hard acceleration?”

03M112/M113 Valve Stem Seal Wear and Oil Leaks

Start the engine cold and observe exhaust for blue smoke in the first 30 seconds.petrol1997–2005Engine
CommonEngine $800–$3,500 to fix

Does not apply

The M112 3.2/3.7-litre V6 and M113 5.0-litre V8 petrol engines develop oil consumption from worn valve stem seals and are known to leak at the oil heat exchanger seal and timing cover O-ring. These issues appear progressively with age. The engines are considered fundamentally reliable but require attention to oil levels and seal condition as mileage climbs.

Symptoms to notice

  • Blue or grey smoke on cold start or deceleration
  • Above-normal oil consumption between services
  • Oil residue at timing cover, valve covers, or oil heat exchanger
  • Oil staining beneath engine at front

What to check

  1. Start the engine cold and observe exhaust for blue smoke in the first 30 seconds.
  2. Check oil level relative to last service date to quantify consumption.
  3. Inspect timing cover and valve cover gaskets for oil residue.
  4. Check the oil heat exchanger mounting area for leaks.
  5. Inspect the PCV hose for oil saturation indicating blowby.

Where to look: Valve covers, timing cover front of engine, oil heat exchanger

Ask the seller

  • “How much oil does the vehicle consume between services?”
  • “Has the oil heat exchanger seal or timing cover O-ring been replaced?”
  • “Are there any visible oil leaks at the engine?”
Electrical2

01ABS/ESP Brake Pressure Sensor Connector Corrosion

Check instrument cluster for any combination of ABS, ESP, ETS, or BAS warning lights.1997–2005ElectricalRead the full fault: symptoms, where to look, what to ask the seller

02Fuel pump control unit water damage recall REC-005622 (W166 M-Class, 2012-2015)

Ask for proof the fuel pump control unit recall (REC-005622) was done, or have a Mercedes-Benz dealer check the VIN.2012–2015Electrical
OccasionalElectrical $0–$1,200 to fix

Does not apply

On the W166 Mercedes-Benz M-Class (all engines, 2012-2015) water can reach the fuel pump control unit, which can interrupt fuel supply and make the engine stall or not start. Mercedes-Benz Australia recalled affected cars by VIN under REC-005622 and the repair is free at a Mercedes-Benz dealer.

Symptoms to notice

  • Engine stalls or will not start
  • Engine warning light

What to check

  1. Ask for proof the fuel pump control unit recall (REC-005622) was done, or have a Mercedes-Benz dealer check the VIN.
  2. Start the car from cold, idle it and drive it long enough to watch for stalling or warning lights.
  3. If a workshop inspection is possible: the dealer can inspect the control unit and its connector for corrosion.

Where to look: Fuel pump control unit

Ask the seller

  • “Has the fuel pump control unit recall been done for this VIN?”
  • “Has the car ever stalled or failed to start?”

Mercedes-Benz ML faults in detail

Narrowed to the Mercedes-Benz ML · 2007. Each of these has its own page: the symptoms, where to look, what to ask the seller and what the repair costs. Free, no account needed.

Airmatic Air Suspension Strut Leak and Compressor FailureMajor · SuspensionM272/M273 Balance Shaft Sprocket Premature WearCritical · EngineOM642 Oil Cooler Rubber Seal DegradationMajor · Fluid Leaks

What these repairs cost on other cars

Some of the Mercedes-Benz ML’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

Other Mercedes-Benz models

Mercedes-Benz C-Class41 documented faultsMercedes-Benz A-Class23 documented faultsMercedes-Benz E-Class23 documented faultsMercedes-Benz B-Class8 documented faultsMercedes-Benz GLB8 documented faultsMercedes-Benz GLE7 documented faults

Mercedes-Benz ML buyer questions

Is the Mercedes-Benz ML reliable?

Like any used car, it depends on the specific example and its service history. Across the 10 documented faults for the Mercedes-Benz ML, the recurring problem areas are engine, transmission, and suspension. A Mercedes-Benz ML with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.

What are the most common problems with a used Mercedes-Benz ML?

We've catalogued 10 known faults for the Mercedes-Benz ML, covering engine, transmission, and suspension. All 10 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a Mercedes-Benz ML?

Most single repairs on the Mercedes-Benz ML fall between $800–$4,000 at NZ independent-workshop rates. Some of the 10 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.

Should I get a pre-purchase inspection on a Mercedes-Benz ML?

Yes. A Mercedes-Benz ML inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $24.90 far less than the cost of missing one of the faults on this page.