The B9 A4 is widely considered the most reliable generation of the A4 to date. The 2.0 TFSI uses the EA888 Gen 3 engine shared across much of the Volkswagen Group, paired with either a 6-speed manual or the DL382 7-speed S tronic wet-clutch automatic. European orders opened in autumn 2015. Pre-facelift models were badged 2.0 TFSI with 190 hp, the 2019 facelift introduced the 40 TFSI designation with 190 hp and a 12V mild-hybrid system, and later 40 TFSI cars were raised to 204 hp with the 7-speed S tronic and front-wheel drive or optional quattro. The platform is refined, the interior competes well in the segment, and parts availability is excellent.· more· less
Proven EA888 engine, widely supportedRefined ride and interior quality
Water pump/thermostat housing failsCarbon buildup on intake valves
Buy if: You want a well-rounded premium sedan with proven running gear and can verify coolant system condition and service history.
Avoid if: You mainly drive short urban trips under 15 km (carbon buildup accelerates) or want the simplest possible ownership experience.
Price & maintenance
Used price
€24,000
median asking price, typically 70,000 km
Typical range€19,500 – €27,900
Kilometres drivenAll
Maintenance cost
€900 – €1,650/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€550 – €950 /yr
Risk bufferunplanned repairs€350 – €700 /yr
Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Ownership costs
Maintenance assumes 15,000 km a year. Price estimates are based on German asking prices. Prices and costs vary by vehicle condition and location.
Used price
€24,000
Typically €19,500 – €27,900, at around 70,000 km.
Kilometres driven
Maintenance
€900 – €1,650per year
€550 – €950
service, tyres, brakes
€350 – €700
repair buffer
Price & maintenance
Used price
€19,900
median asking price, typically 90,000 km
Typical range€18,300 – €24,400
Maintenance cost
€900 – €1,650/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€550 – €950 /yr
Risk bufferunplanned repairs€350 – €700 /yr
Price estimates are based on French asking prices. Prices and costs vary by vehicle condition and location.
Ownership costs
Maintenance assumes 15,000 km a year. Price estimates are based on French asking prices. Prices and costs vary by vehicle condition and location.
Integrated plastic housing cracks or water pump seal fails, typically between 60,000-100,000 km · more· less
The EA888 Gen 3 uses an integrated water pump and thermostat housed in a single plastic assembly. Over time, the internal O-ring swells from oil contamination, and the plastic housing can develop cracks from repeated thermal cycling. Symptoms include gradual coolant loss (often evaporating before leaving visible puddles), the low coolant warning light, erratic temperature readings, and poor cabin heating. This is the most commonly reported failure on B9 2.0 TFSI engines. When one component fails, specialists recommend replacing the complete assembly. An 8-year coverage extension for this repair exists only under a US class-action settlement and does not apply to European cars. Independent shop repair costs €800-1,200 (parts €350-500, labor 3-4 hours), Audi dealers quote €1,400-1,600. Aluminium aftermarket housings are available as a more durable upgrade.
Carbon buildup on intake valves
up to €1,0002 of 8
Direct injection allows carbon deposits to accumulate on intake valves, reducing airflow and power · more· less
The EA888 Gen 3 in the B9 combines direct injection with port injection, and the port injectors wash the intake valves at low and partial load. That slows the oil-vapour deposits that coat the valves on a pure direct-injection engine, but it does not always prevent them. Where deposits do build up, symptoms appear gradually between 60,000-100,000 km: rough cold-start idle, subtle hesitation during acceleration, slightly increased fuel consumption, and occasional misfires. Walnut shell blasting is the only effective cleaning method. Independent specialists charge €500-800 for walnut blasting, Audi dealers quote €1,000-1,500. Treat this as a condition-based repair confirmed by symptoms or a borescope inspection rather than a fixed service interval.
Timing chain tensioner wear (2016-2018 models)
up to €2,5003 of 8
Check valve in tensioner loses oil pressure overnight, causing cold-start rattle lasting 1-3 seconds · more· less
Early B9 models (2016-2017, some early 2018) used timing chain tensioners with a release valve that could weaken over time, allowing oil pressure to bleed off overnight. This results in a distinctive metallic rattle for 1-3 seconds on cold startup while the chain runs slack. Audi updated the tensioner design from mid-2018 production onward, so facelift 40 TFSI models are rarely affected. If rattling persists beyond a few seconds or occurs regularly, the chain, guides, tensioner, and sprockets should all be replaced preventively. Parts cost €600-900, with labor requiring 6-8 hours due to deep engine access. Independent shops charge €1,500-2,000 total, Audi dealers €2,200-2,500. Ignoring prolonged rattle risks chain skip and catastrophic valve-to-piston contact.
S tronic DL382 mechatronic and clutch wear (automatic only)
up to €3,5004 of 8
Dual-clutch gearbox develops jerky shifts or fault codes, typically after 60,000 km without fluid change · more· less
The DL382 is a wet-clutch dual-clutch unit and significantly more reliable than the notorious DQ200 dry-clutch DSG found in transverse-engine Audi and Volkswagen models. However, the mechatronic unit can develop solenoid or valve body issues, and the clutch pack gradually wears, particularly in cars used predominantly in stop-and-go traffic. Symptoms include jerky low-speed shifts (especially 1st-to-2nd), hesitation from standstill, occasional downshift clunks, and gearbox warning messages. Audi's own service schedules include an S tronic oil change, and specialists recommend every 60,000 km to prevent premature wear. Mechatronic repair costs €1,200-2,000, clutch pack replacement €2,500-3,500. Manual gearbox cars have essentially no transmission reliability concerns.
PCV valve failure
up to €5005 of 8
Internal diaphragm splits, causing rough idle, boost loss, and check engine light · more· less
The positive crankcase ventilation valve contains a rubber diaphragm that deteriorates with age and heat exposure, typically between 70,000-120,000 km. When the diaphragm splits, symptoms include rough idle, a hissing noise from the engine bay, lean mixture fault codes (P0171), and in some cases boost pressure loss as crankcase gases escape past the failed seal. The PCV valve itself costs €50-80, but access requires removing intake components. Total repair at an independent shop is €250-350, Audi dealers charge €400-500. Cheap aftermarket PCV valves tend to fail prematurely; Hengst or OEM parts are recommended.
Front control arm bushing wear
up to €1,5006 of 8
Multi-link front suspension bushings deteriorate, causing clunking and vague steering after 80,000-130,000 km · more· less
The B9 A4 uses a multi-link front suspension with aluminium control arms. The rubber bushings in these arms degrade over time, becoming brittle and cracking. Symptoms include clunking sounds over bumps at low speed, imprecise steering feel, and uneven inner-edge tyre wear from misalignment. Audi recommends replacing entire control arms rather than pressing in new bushings, which drives up the cost. A full front control arm set with labour costs €600-900 at an independent shop with quality aftermarket parts (Lemforder or Meyle HD). Audi dealer quotes reach €1,500-2,500 with OEM parts. A four-wheel alignment (€100-150) should follow any control arm work.
Hydraulic engine mount leak
up to €1,0007 of 8
Electromagnetically controlled engine mounts leak fluid, causing idle vibration after 60,000-100,000 km · more· less
The B9 A4 uses electronically controlled hydraulic engine mounts that adjust stiffness based on engine speed. Over time, the rubber casing cracks from heat exposure and the hydraulic fluid leaks out, visible as reddish-brown residue on the mount body. Once fluid is lost, noticeable vibration appears at idle and during start-stop operation. Individual mounts cost €120-200 each, and both typically need replacing together. Total repair is €400-600 at an independent shop, €800-1,000 at an Audi dealer. Not safety-critical but affects comfort noticeably.
Ignition coil degradation
up to €3508 of 8
Coil packs fail from heat cycling, causing misfires typically between 60,000-120,000 km · more· less
Ignition coil failure is a known characteristic of EA888 engines. Heat cycling weakens the internal insulation over time, leading to cylinder-specific misfires (fault codes P0301-P0304), rough idle, and hesitation. Individual coils cost €30-50 aftermarket or €60-90 OEM. When one fails, replacing all four along with fresh spark plugs is recommended, as the remaining coils are at a similar wear stage. Total cost for four coils plus plugs: €100-200 at an independent shop, €250-350 at an Audi dealer. Leaving misfires unaddressed risks catalytic converter damage from unburnt fuel.
Reliable for its class, but coolant system and carbon buildup need monitoring
The B9 A4 2.0 TFSI is a significant reliability improvement over earlier A4 generations. The EA888 Gen 3 engine is fundamentally robust and many examples exceed 200,000 km without major powertrain issues. The water pump/thermostat housing is the most common repair and should be proactively monitored. Carbon buildup on the intake valves is an inherent characteristic of direct-injection engines that requires periodic attention. The DL382 S tronic is reliable with regular fluid changes every 60,000 km. Pre-2019 models need extra attention to the timing chain tensioner. Overall, this is a well-understood car with predictable maintenance needs.
Service history
Complete Audi dealer or specialist records essential. Verify oil changes every 15,000 km or annually with correct specification (VW 504 00). Check whether S tronic fluid has been changed.
Tires
Check tread depth, age (date codes on sidewall), and uneven inner-edge wear patterns. Inner tyre wear may indicate worn control arm bushings.
Cold start
Start the engine completely cold. Listen for metallic rattling in the first 10-30 seconds, which indicates timing chain tensioner issues.
Test drive
Drive for at least 20 minutes including varied speeds and stop-and-go traffic. Pay attention to gear changes, steering feel, and any warning lights.
Specific for this vehicle
Check coolant level and thermostat housing
With engine cold, inspect the coolant reservoir level and colour. Look underneath the engine for dried coolant residue around the thermostat housing. This is the most important check on any B9 2.0 TFSI.
Listen for cold-start chain rattle (pre-2019 models)
On 2016-2018 cars, any metallic rattle lasting more than 2-3 seconds on cold start indicates timing chain tensioner wear. Must start engine completely cold.
Test S tronic gearbox thoroughly (if equipped)
Drive for 15+ minutes in stop-and-go conditions. Feel for jerky 1st-to-2nd gear shifts, hesitation from standstill, or clunking. Ask when gearbox fluid was last changed.
+ 4 more checksShow less
Check for rough idle or hesitation when warm
After driving 15 minutes, idle the engine and listen. Roughness or hesitation may indicate carbon buildup on intake valves or a failing PCV valve.
Feel for idle vibration (engine mounts)
With engine warm and idling in drive with brake held, feel for excessive vibration through the steering wheel or cabin. Look for reddish fluid on mount bodies.
Listen for clunking over bumps at low speed
Drive slowly over speed bumps. Clunking from the front indicates worn control arm bushings. Check inner front tyre edges for uneven wear.
Verify starter generator recall completed
Campaign 27H2 covers the belt-driven starter generator, which can overheat and cause a fire. It runs across 2017-2020 production, so confirm applicability with an Audi dealer using the VIN.
Recalls and Technical Service Bulletins
Frontal airbag and belt pretensioner igniter propellant may degrade (2016 production)Verify completed
Belt-driven starter generator may overheat, fire risk - campaign 27H2 (2017-2020 production, VIN check required)Critical - verify completed
Coolant pump overheating risk from debris blockage (2016 models with 2.0 TFSI)Software update - verify completed
Contact an Audi dealer with the VIN to verify all recalls and open service campaigns have been completed. The 27H2 starter generator campaign is the most important one on European cars, because an overheating unit can cause a fire.
Warranty Status
Factory warranty (2 years, no km limit)Expired on all pre-2024 models
Rust perforation warranty (12 years)Active on all 2014+ models
Audi extended warrantyAvailable through Audi dealers for cars under 10 years / 150,000 km
All used A4 B9 2.0 TFSI models from 2016-2023 are outside their original 2-year factory warranty. The 8-year water pump and thermostat coverage often quoted online comes from a US class-action settlement and does not apply in Europe, so budget for that repair yourself. The 12-year rust perforation warranty remains active on all B9 models.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
