Volkswagen Transporter L1H1 28 2.0 TDI 102hp common faults.

2015–2019, van, diesel, 102 HP.

The fault list covers: CAAB, CXGB engine, MQ250 transmission.

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7 fault write-ups. 6 important. 6 recalls.

If you know the year, pick it. Faults for other years drop out of the list.

Before you buy

Known faults

6 important faults

critical1

Rising oil level: interrupted particulate filter regeneration

critical

On short urban trips the particulate filter cannot burn through. The engine control unit then injects extra fuel late in the cycle to heat the filter, and part of that fuel passes down the cylinder wall into the sump. The oil level rises, the oil thins out, and it lubricates worse.

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The maker addresses this itself. Audi's 2015 service bulletin (01-15-18) tells the technician how to read the oil level on 2.0 TDI engines, because an overfilled level triggers an oil change message with no engine warning light and no stored fault code.

An oil level above the maximum calls for an immediate oil change, and it points to short urban trips. A diesel driven only in town is a bigger risk from both the particulate filter and the turbo.

A thinned, rising oil level is one precondition of a runaway engine. A diesel controls torque with the quantity of fuel injected, and it has no throttle. So if enough combustible liquid reaches the intake, the engine starts running on its own oil, and cutting the injection or switching off the ignition will not stop it. The revs climb on their own until the engine destroys itself.

A raised oil level alone is rarely enough for this. The classic trigger is a failed turbo shaft seal that feeds oil mist into the intake. But the two go together: thinned oil lubricates worse, and poorer lubrication damages the turbo bearing first.

If it happens while driving, the key does not help. Only cutting off the air does: cover the intake, discharge a dry powder extinguisher into the intake tract, or on a manual select a high gear with the parking brake on and release the clutch quickly.

What to check

Pull the dipstick with a cold engine on level ground: the level must not be above the maximum mark
Smell the oil on the dipstick: a diesel smell means it is thinned with fuel
Ask whether the dash has ever shown an oil level sensor or oil change message

5 more steps in the write-up

expensive5

MQ200 / MQ250 manual gearbox: differential bearing and synchros

expensive

The light, magnesium cased MQ200 and the MQ250, sized for higher torque, are the most widespread manual gearboxes in the transverse engine VAG models. Both have the same two weak points, and both depend on use.

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The first is the differential bearing: as it wears you first get a droning, then a whine from the thrust bearings of the output shaft. Left alone, the planetary shaft can fail and in extreme cases punch through the gearbox casing: from then on it is not a repair but a replacement.

The second is the synchros: they can start crunching at around 50,000 km with aggressive driving. This type does not like dumping the clutch or slipping it, and on a used car that is exactly what you have to listen for.

above 50,000 km

What to check

On the test drive with the window down, listen to the gearbox both off and on the throttle: droning or whining is suspect
Shift up and down quickly, especially into 2nd and 3rd: crunching means synchro wear
Try engaging 1st and reverse when cold: resistance here means wear

2 more steps in the write-up

AdBlue / SCR: NOx sensor and crystallising dosing valve

expensive

On AdBlue (SCR) diesels the NOx sensor after the catalyst ages, and the tip of the dosing valve crystallises. An AdBlue warning appears on the dash, often with a countdown ("X km of starts remaining"), while the tank is full. Crystallisation typically forms with short trip, urban use, or from poor quality AdBlue; on a car standing below freezing the circuit can freeze up too.

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At the end of the countdown there is a start inhibit: the car can become undriveable until it is repaired. The fault is not always the SCR catalyst: the cause is the sensor or the dosing valve.

between 100,000 and 160,000 km

What to check

Check whether there is an AdBlue filler (next to the fuel cap or in the boot): if there is not, this car does not have the system
Read all the dash messages after switching the ignition on: there should be no AdBlue warning and no km countdown
Ask for a fault code read: the codes P20EE, P2202 and P229F belong here. A cleared code comes back after a few tens of kilometres

2 more steps in the write-up

EA189 TDI: EGR valve and particulate filter blocking

expensive

The EGR valve and its cooler block up with soot and oily deposits; the particulate filter cannot regenerate on short urban trips. The signs are reduced power, a warning light, and frequent regeneration. The software update after the diesel emissions affair made the EGR operate more often, which accelerated the phenomenon: the maker gave goodwill repairs in several cases.

between 140,000 and 160,000 km

What to check

Ask what kind of journeys the car did: a daily short urban run is the worst for the filter
With a code reader look at the stored faults (P0401/P0402, and P2002 for the filter)
Ask whether it received the post emissions affair software update, and when

1 more steps in the write-up

Dual mass flywheel: diesel

expensive

The internal springs of the flywheel tire, and the two discs knock against each other. The signs are a rattling or knocking from the bellhousing at idle and when releasing the clutch pedal, and vibration through the floor. If the clutch slips without a burnt smell, that also points to the flywheel. It is worth replacing in time: a disintegrated flywheel can destroy the bellhousing too. At a clutch replacement the two go together anyway.

What to check

At idle, without touching the clutch pedal, listen for the rattle from the bellhousing, then press the pedal: if it stops, that is suspect
Watch for the characteristic clatter on starting and switching off
Put your foot on the floor at idle: a noticeable vibration indicates tired springs

2 more steps in the write-up

TDI: the vanes of the variable geometry (VNT) turbo stick

expensive

The vanes of the variable geometry turbo are glued together by soot and oil arriving through the EGR. First you get overboost or a lack of boost, then loss of power above 2,000 rpm, and finally limp mode. Caught in time it is enough to remove the turbo, clean it and fit a new actuator rod. Short urban trips and gentle, low rev driving speed up the deposits.

What to check

On the motorway, load it above 2,000 rpm: does it pull evenly, or does the power break up
Watch whether the warning light flashes up under acceleration (overboost protection)
Ask what kind of journeys it did: a daily short urban run is the worst

1 more steps in the write-up

cheap repair1

Sliding door: wear of the lower roller and the guide rail

cheap repair

The lower roller carries the weight of the sliding door, and that is what wears first: the door is hard to start moving, it sticks on the way, and at the end it "drops" off the rail. The other characteristic case is the guide rail working loose: the M5 mounting bolts come loose, the rail hangs down, and from then on the door presses against the body, which you can see on the paint too. If the roller is not replaced, the hinge and the bodywork are damaged too. On a fleet car that was opened many times a day, the roller wears sooner.

forum sources only

What to check

Open and close the sliding door several times, fully and slowly: both binding and grinding are signs
Lift the door while it is open: vertical play shows wear of the lower roller
Go along the lower rail: a loose bolt, a bent rail, a worn running surface

2 more steps in the write-up

Official recall6 recallsShow

The manufacturer fixes these for free at a franchised dealer. Ask with the VIN whether it was done.

A12/00221/20Safety recallInjuriesno date · EU Safety Gate

Cars initially used for internal purposes of Volkswagen AG might not have been correctly modified before they were sold to the general public. There is a possibility that certain safety systems of these cars are not correctly modified for street use.