Fault guides

We explain the symptoms we encounter most in the workshop in plain language and while maintaining technical accuracy. Our goal isn't to create panic: it's to let you know which sound, which alert is truly urgent, which can be followed up.

VAG Special Service

Special for your brand maintenance approach

Even though they share the same platform, Porsche, Audi, Volkswagen, Skoda and Seat have different maintenance priorities. We have compiled what we do and what points we pay attention to in separate guides for each brand.

Porsche PDK maintenance, fluid monitoring, gasket leaks and brake-suspension control. Read the guide →

Audi TFSI engine, quattro transmission and S tronic transmission maintenance. Read the guide →

Volkswagen TSI/TDI engine maintenance, DSG oil and adaptation works. Read the guide →

Skoda Maintenance plan, DSG check and pre-purchase inspection on Octavia and Superb. Read the guide →

Seat DSG diagnostics, engine maintenance and chassis inspection in Leon and Ibiza. Read the guide →

All our services →

Fault guides

All articles

Porsche sahipliğinde bakım ve sık görülen arızalar

PorscheModel GuideMaintenance

Maintenance and common malfunctions under Porsche ownership

Maintenance facts of daily driving a Porsche: service intervals, PDK, oil and fluid checks, things to look for before purchasing.

January 1, 2027 · 2 min read

Passat B8 ve Superb: sık görülen arızalar ve bakım öncelikleri

Model GuidePassatsuperb

Passat B8 and Superb: common malfunctions and maintenance priorities

The highlights of the Passat B8 and Superb are engine, DSG, electronics and suspension; What should be taken into consideration as a long-distance vehicle?

29 December 2026 · 2 min read

Golf, A3, Leon, Octavia: ortak platformda sık görülen arızalar

Model GuidegolfAudi A3

Golf, A3, Leon, Octavia: common malfunctions on the common platform

Common failure points of the four models sharing the same platform: engine, DSG, suspension and electronics. What should be considered when buying and using?

26 December 2026 · 2 min read

Motor yazılımı (Stage 1) öncesi bilinmesi gerekenler

PerformancesoftwareGuide

Things to know before engine software (Stage 1)

Does the software update tire the engine, affect the warranty, which parts should be checked? Things to consider before and after application.

December 23, 2026 · 2 min read

TSI mı TDI mı? VAG motor ailelerine göre alım rehberi

second handEngineGuide

TSI or TDI? Buying guide according to VAG engine families

Characteristics of the gasoline TSI/TFSI and diesel TDI families, which one makes sense according to the usage profile and points to check before purchasing.

20 December 2026 · 2 min read

Kilometre düşürme ve hasar kaydı: ekspertizin göremediği yerler

second handGuideSecurity

Mileage reduction and damage record: places the expert cannot see

How to understand a vehicle with reduced mileage? What does the damage record not show? Practical ways to access reliable second-hand information.

17 December 2026 · 2 min read

İkinci el VAG alırken servis kontrolü: 20 maddelik liste

second handGuideservice

Service check when buying a second-hand VAG: 20-item list

What should be checked other than the expert report? 20-item service checklist for engine, transmission, electronics and past maintenance when purchasing a second-hand VAG.

14 December 2026 · 2 min read

Klima neden kokar, neden soğutmaz? Bakım rehberi

air conditioningMaintenancecomfort

Why does the air conditioner smell and why does it not cool? Maintenance guide

What causes bad smell, poor cooling and condensation in the vehicle air conditioner? Relationship between gas level, compressor, pollen filter and disinfection.

December 11, 2026 · 2 min read

Hava, yakıt, polen ve yağ filtresi: değişim aralıkları ve belirtiler

MaintenanceFilterGuide

Air, fuel, pollen and oil filter: change intervals and symptoms

The four filters have different functions, neglecting them is expensive. Which filter protects what, what symptom it gives and what determines the replacement interval.

December 8, 2026 · 2 min read

Periyodik bakımda neler yapılır? LongLife yağ tartışması

MaintenanceEngineGuide

What is done during periodic maintenance? LongLife oil controversy

Items of periodic maintenance, why LongLife oil range is not suitable for every vehicle and which parts will be fatigued by delaying maintenance?

December 5, 2026 · 2 min read

ABS/ESP uyarı lambası neden yanar, araç kullanılır mı?

brakeelectronicsSecurity

Why does the ABS/ESP warning light come on? Can the vehicle be driven?

What do ABS and ESP warnings mean when they come on together or alone? Sensor, battery voltage and its relationship with the brake system; driving safety assessment.

December 2, 2026 · 2 min read

Lastikte düzensiz aşınma neyi anlatır? Rot-balans ve geometri

tiresuspensionMaintenance

What does uneven tire wear indicate? Wheel balancing and geometry

What are signs of tire wear on the inner or outer shoulder, wear in the middle and a jagged surface? When is geometry adjustment needed?

29 November 2026 · 2 min read

Tak-tuk sesleri: süspansiyon ve salıncak arızalarının izi

suspensionFault guides

Tak-tuk sounds: trace of suspension and swingarm failures

Where do the knock-tuk sounds heard on bumps and rough roads come from? Separation of sounds originating from mountings, wishbones, anti-roll bars and shock absorbers.

26 November 2026 · 2 min read

Fren diski ve balata ne zaman değişir? Belirtiler ve doğru karar

brakeMaintenanceSecurity

When to change brake discs and pads? Symptoms and the right decision

Why isn't there a single answer to the question "at how many kilometers does it change" for brake pads and discs? Symptoms, thickness measurement and change rules.

November 23, 2026 · 2 min read

Fren sesi neden gelir, hangi ses tehlikeli?

brakeSecurityFault guides

Why does the brake sound occur? Which sound is dangerous?

Brake noises are not always malfunctions, but some require urgent intervention. Squealing, squeaking, metallic rubbing: which means what?

20 November 2026 · 2 min read

VCDS / OBDeleven: dijital arıza tespiti ve kodlama nedir?

DiagnosiselectronicsGuide

VCDS / OBDeleven: what is digital diagnostics and coding?

What can be done with diagnostic devices, what is the difference between coding and fault diagnosis? What VAG vehicle owners need to know.

November 17, 2026 · 2 min read

Lambda, MAF ve krank sensörü: arızalı sensörün izini sürmek

ElectricitysensorDiagnosis

Lambda, MAF and crank sensor: tracking down the faulty sensor

How do engine management's three critical sensors work, what symptoms do they give when they fail, and why should live data be read first?

November 14, 2026 · 2 min read

Motor uyarı lambası yandı: panik yapmadan izlenecek yol

ElectricityDiagnosisFault guides

Engine warning light came on: how to follow without panic

Can the vehicle be driven when the check engine light comes on? The difference between a solid and flashing warning, what to do in the first 24 hours and the reading order.

November 11, 2026 · 2 min read

Akü değişimi sonrası akü kaydı ve Start-Stop neden şart?

ElectricityBatteryMaintenance

Why are battery recording and Start-Stop necessary after battery replacement?

Installing a new battery alone is not enough in VAG vehicles. Why is battery registration done, what happens if it is not done, why is Start-Stop disabled?

November 8, 2026 · 2 min read

Ateşleme bobini arızası nasıl anlaşılır?

ignitionElectricityFault guides

How to detect ignition coil failure?

Ignition coil behind the stalling, shaking and engine warning light? Symptoms, determining which cylinder it is in and replacement rules.

November 5, 2026 · 2 min read

Otomatik şanzıman titreme ve kayma: tiptronic ve multitronic

transmissionautomaticFault guides

Automatic transmission shudder and slip: tiptronic and multitronic

What causes vibration, delayed gear and slipping sensation in automatic transmission? Differentiation of symptoms caused by torque converter, oil and CVT belt.

November 2, 2026 · 2 min read

Quattro / Haldex bakımı: ihmal edilirse ne olur?

quattrohaldexMaintenance

Quattro / Haldex maintenance: what happens if neglected?

Why is oil and filter maintenance critical in four-wheel drive systems? Signals given by the Haldex clutch before failure and the correct maintenance order.

October 30, 2026 · 2 min read

Debriyaj ne zaman biter? Manuel şanzıman belirtileri

transmissionclutchFault guides

When does the clutch end? Manual transmission symptoms

6 symptoms that show that the clutch set has reached the end of its life, lifespan varying according to use, and things to check before replacement.

October 27, 2026 · 2 min read

DSG'de sorun mekatronikte mi, kavramada mı? Teşhis rehberi

DSGtransmissionDiagnosis

Is the problem with DSG in mechatronics or clutch? Diagnostic guide

What measurements are taken before replacing parts in case of DSG vibration and shaking? Practical way to distinguish clutch, mechatronics and engine.

October 24, 2026 · 2 min read

DSG yağ bakımı: ne zaman ve neden yapılmalı?

DSGtransmissionMaintenance

DSG oil maintenance: when and why should it be done?

In DSG, oil serves not only lubrication but also pressure and cooling. DQ200-DQ250 difference, maintenance interval and importance of oil selection.

October 21, 2026 · 2 min read

DPF lambası neden yanar? Temizlik mi, değişim mi?

dieselDPFexhaust

Why does the DPF light come on? Cleaning or change?

Steps to be followed without panic when the particle filter warning comes on in a diesel vehicle: distinction between regeneration, cleaning and replacement.

October 18, 2026 · 2 min read

Turbo arızasının belirtileri ve erken müdahalenin önemi

turboEngineFault guides

Symptoms of turbo failure and the importance of early intervention

Does the trio of whistling noise, loss of power and blue smoke indicate turbo failure? 5 habits and diagnostic methods that determine the life of the turbo.

October 15, 2026 · 2 min read

Dizel enjektör arızası: belirtiler, teşhis ve doğru müdahale

dieselinjectorFault guides

Diesel injector malfunction: symptoms, diagnosis and correct intervention

Do idle vibration, black smoke and fuel increase in a diesel vehicle indicate the injector? Testing methods and cleaning-renewal decision.

October 12, 2026 · 2 min read

Hararet yapan araçta ne yapmalı, sonrasında neler kontrol edilir?

EnginecoolingEmergency

What should be done in a vehicle that is overheating and what should be checked afterwards?

What to do in the first 10 minutes when the temperature indicator rises and the checklist that saves the engine afterwards. 3 mistakes made on a hot engine.

October 9, 2026 · 2 min read

Soğutma suyu neden eksilir? Görünmeyen kaçakların izi

EnginecoolingFault guides

Why does coolant decrease? Traces of invisible fugitives

There are no drops under the hood, but is there less water? 7 causes of coolant loss, the importance of pressure testing and which table is urgent.

October 6, 2026 · 2 min read

Triger kayışı mı zincir mi? VAG motorlarında zamanlama sistemi

EnginetimingMaintenance

Timing belt or chain? Timing system in VAG engines

The difference between timing belt and timing chain, change intervals and what the noise on cold start means: practical guide.

October 3, 2026 · 2 min read

Motor yağ yakıyor: mavi duman ve yağ eksilmesinin nedenleri

EngineFat BurningFault guides

Engine burns oil: causes of blue smoke and oil loss

Blue smoke from the exhaust and the need to add oil between maintenance... 7 reasons for burning oil, which one is urgent and the order of diagnosis.

September 30, 2026 · 2 min read

Motor revizyonu sonrası ilk 1.000 km: rodaj ve kontrol listesi

EngineRevisionMaintenance

First 1,000 km after engine overhaul: running-in and checklist

The first 1,000 km after overhaul is the period that determines the life of the engine. What should be taken into consideration during running-in, what checks should be made?

September 27, 2026 · 2 min read

Motor toplama (revizyon) nedir, ne zaman gerekir?

EngineRevisionCylinder Head Machining

What is engine assembly (overhaul) and when is it required?

Under what symptoms does engine overhaul come into question, what operations does it involve, and why might overhaul be economical instead of replacing the engine? Step by step explanation.

September 25, 2026 · 2 min read

Araçta tekleme neden olur, nasıl giderilir?

EngineignitionFault guides

What causes misfiring in a vehicle and how to fix it?

Shuddering at idle, shaking when accelerating and not consuming gas: the 6 most common causes of misfiring, which test shows what and how to avoid unnecessary parts replacement.

September 22, 2026 · 2 min read

DSGtransmissionFault guides

How do you recognise a DSG transmission fault?

What do shaking, shaking and "emergency program" warning on DSG mean? Which symptom is urgent and which can be monitored? Practical guide from the workshop.

September 20, 2026 · 2 min read

Our articles are prepared by Osman Karaçör and Serdar Özdemir , reviewed with our 25 years of workshop experience. Each article shows its last update date. For a case specific to your vehicle, call Serdar Özdemir +90 544 416 44 08