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Audi A3 30 TDI Pro Line common faults.

2020–2024, saloon, diesel, 116 HP.

The fault list covers: DTRB, DTRD engine, DQ381 transmission.

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7 fault write-ups. 5 important. 3 recalls.

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

Before you buy

Known faults

5 important faults

critical2

1.6 and 2.0 TDI: the EGR cooler leaks internally and coolant disappears without a trace

critical

The EGR cooler cools the recirculated exhaust gas before it enters the intake again, and coolant flows through it while it does so. The temperature difference between the two sides is large, so the wall can crack or the gasket can let through, and then the coolant reaches the exhaust or the intake side. This leaves no puddle under the car and the place of the leak is not visible from outside: the coolant evaporates and the level drops slowly, over weeks. The accompanying signs are whitish smoke, a rising coolant temperature, raised pressure in the cooling system and a sweetish smell. If it goes on for months the cylinder head can be damaged too, because the cooling gradually gets worse. On the EA189 engines the fault code P2425 usually comes with it. The problem is reported above 100,000 km, and replacing the cooler costs 600 to 1,500 euro.

above 100,000 km600–1,500 EUR

What to check

  • Look at the level in the expansion tank and ask how much has to be topped up
  • Look for traces outside: if the level drops but there is no puddle or streak, the leak is internal
  • After a cold start watch the exhaust, because lasting whitish smoke is not only condensation
2 more steps in the write-up

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.

Show the rest

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

expensive3

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.

Show the rest

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

DQ381 (7 speed wet DSG): mechatronics and clutch position sensor

expensive

The 7 speed, wet clutch DSG that replaced the DQ250 in the MQB models (0GC / DQ381) is vulnerable from the mechatronics side. Typical faults are a harsh 2 to 3 shift, delayed D/R engagement and limp mode; a fault in the clutch position sensors gives a separate group of codes.

Show the rest

The wet clutch is more durable than the dry one, but as it wears you get shuddering and slipping when pulling away: the revs flare and the acceleration does not follow.

What to check

  • Standing still on the brake, shift between D and R and watch the engagement time and any jolt
  • Try pulling away on a slope too: shuddering, or revving without pulling, points to clutch wear
  • On the test drive watch the 2 to 3 shift specifically, cold and warm
2 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

comfort1

MIB3 infotainment: freezing, restarting, black screen

comfort

On the MQB evo generation the MIB3 touchscreen freezes, restarts on its own, and sometimes stays black. In the What Car? survey, 59 per cent of 8Y A3 owners reported a fault, and 44 per cent of those concerned the infotainment. Volume and temperature are set on touch sliders instead of physical buttons, and if the system hangs you cannot adjust them while driving either.

Show the rest

The maker released several software updates. Many cases are resolved by them, but not all. The update is free and fault finding is not, so before you buy, check whether the latest version has been installed.

What to check

  • Switch the system on and let it run for at least 10 to 15 minutes during the test drive
  • Try everything: navigation, Bluetooth, phone mirroring, reversing camera, radio
  • Set the volume and the climate with the slider: does it hang, is the response delayed
2 more steps in the write-up

cheap repair1

DSG selector lever: failure of the P position switch

cheap repair

The dash shows "Error: Workshop! Only leave vehicle in position P" with an audible warning. The message appears in whatever language the car is set to, for example "Fehler: Werkstatt! Fahrzeug nur in Stellung P verlassen" in German.

Show the rest

The message points at the gearbox, but the fault is not there. A tiny switch sits in the module under the selector lever and signals that the lever is in park (P). Its contact wears and can also burn. That makes the signal unreliable, and the car warns you. The fault codes appear as 617752, P173400 or B116229.

At first it is intermittent. Sometimes the message comes up, sometimes not, so a short test drive easily misses it. Later it becomes permanent, and the gearbox can drop into limp mode.

This fault looks more expensive than it is. The maker released a separate retrofit switch kit for it (5Q0713128A for the black module, 3Q0713128 for the white one), which can be fitted in half an hour. The kit costs 70 to 100 pounds. At a franchised dealer, however, the whole selector lever module sometimes gets replaced, which costs 626 to 1,000 pounds there. So the difference between the two routes is roughly tenfold.

The affected group is post 2013 MQB platform Volkswagen, Audi, Seat and Skoda cars with a DSG gearbox. The switch is in these gearboxes, because that is what these cars have in common. The part itself is not part of the gearbox but of the module under the lever.

What to check

  • Watch the dash after starting: the message is intermittent and can be missed on a short loop
  • Move the lever from P to D and back several times, then get out and lock the car
  • Ask whether the selector lever switch has been replaced already, and ask for the invoice
2 more steps in the write-up

Checklist

Audi A3 30 TDI Pro Line

First what you would check on any car. Then the faults of this model.

Before you buy

Checklist

The printed sheet starts with what you would check on any car. What you tick stays on this device only.

On every car

Ask the owner

Faults of this model

vinkodex.com · Before you buy it, see what can go wrong.

Official recall3 recallsShow

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

A12/00667/22Safety recallFire, Injuriesno date · EU Safety Gate

The fuse in the high-voltage (HV) system may have been produced with an insufficient amount of extinguishing sand. In the event of a short circuit in the high-voltage system, a voltage flashover could occur inside the vehicle and subsequently pose a risk of fire and injuries. The product does not comply with the Regulation on the approval and market surveillance of Motor Vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

The authority's notice

A12/01247/22Safety recallInjuriesno date · EU Safety Gate

Deviations in the manufacturing process may result in either of the front seat belt reels not achieving full restraint, increasing the risk of injury in the event of an accident. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

The authority's notice

A12/01381/22Safety recallInjuriesno date · EU Safety Gate

Improper folding of the airbag may impede the deployment of the passenger side airbag in the event of an accident. A rip could occur in the airbag leading to insufficient protection, increasing the risk of injury. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

The authority's notice

Engine and transmission

2 engines · 1 transmissions

DTRB · 2.0 TDI

85 kW (116 HP) · diesel

DQ381 · 7-speed DSG, wet clutch

DSG · 7 speed

Clutchwet
Torque limit420 Nm
MakerVolkswagen

We built the code from the model and the gear count. The factory sheet does not state it. More than one engine code is possible. The fault list shows the faults of each.

Variant data

What is in this version

Factory data

Trim
30 TDI Pro Line
Body
saloon
Fuel
diesel
Transmission
automatic
Engine size
1968 cc
Power
85 kW (116 HP)
Drive
FWD
Production
2020–2024

Factory service interval

The manufacturer specifies this for this version. Of the mileage and the time, the one that comes first is the one that counts.

  • Air filter

    • 60,000 km or 4 years

  • Cabin (pollen) filter

    • 30,000 km or 2 years

  • Engine oil and oil filter

    • LongLife30,000 km or 2 years(valid only with LongLife-approved oil)
    • 15,000 km or 1 year

  • Brake fluid change

    • first: 3 years, then 2 years(first change at 3 years, then every two years)

  • DSG oil change, WET clutch gearbox

    • 60,000 km or 4 years

  • Timing belt, 1.6 / 2.0 TDI (EA188/EA189/EA288)

    • 210,000 km(EA288, including the 1.6 TDI, with no time limit. 130,000 miles = 209,215 km. Parts maker repair specification, read by a human. The interval chart at https://www.rwcmotorsport.com/tech/tdi-maintenance.php gives the same figure independently.)

  • Coolant (antifreeze) change

    • first: 193,000 km or 10 years, then 97,000 km or 5 years(G13 / G12++: first change at 120,000 miles or 10 years, then every 60,000 miles or 5 years)

  • Fuel filter, diesel

    • 60,000 km or 2 years
All 8Y versions

Information, not an expert opinion

We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.

  • A fault on the list does not mean the car you are looking at has it.
  • A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
  • You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.
Details in the terms