The second-generation A3 with the 2.0 TDI is a refined premium compact on the PQ35 platform, shared with the Golf Mk5/Mk6 and SEAT Leon. Available with the older Pumpe Düse engine from 2003 to 2008 and the newer common-rail engine from 2008 onwards, both deliver strong torque and 4.5-6.0 l/100 km fuel economy. The unit-injector cars cover more than the familiar 140 hp BKD and BMM: the 170 hp version uses BMN, and BUY also appears in this family, while the common-rail side spans CBAB, CBBB and CBAA. Body scope matters at the end of the run: the three-door 8P1 finishes in August 2012, while the 2.0 TDI Sportback 8PA continues into March 2013. Parts availability is excellent across the entire VW Group network.· more· less
Strong torque and fuel economyExcellent parts availability
Porous cylinder head (early BKD)EGR and DPF clogging on short trips
Buy if: You want a well-built diesel compact with good refinement and can verify the cylinder head revision (BKD) or Dieselgate recall status (CBAB).
Avoid if: You mostly drive short urban trips (DPF and EGR clogging) or the car has an unknown service history with extended oil change intervals.
Price & maintenance
Used price
€4,000
median asking price, typically 245,000 km
Typical range€2,700 – €6,000
Kilometres drivenAll
Maintenance cost
€700 – €1,400/year
at 15,000 km/year
Fixed costsservice, tyres, brakes€450 – €800 /yr
Risk bufferunplanned repairs€250 – €600 /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.
Coolant seeps through porous casting into combustion chambers, causing white smoke and coolant loss · more· less
The BKD engine's aluminium cylinder head can develop internal porosity, allowing coolant to seep into the bores. Revision A heads (03G 103 308 A, produced 2003-2005) are most prone — nearly all eventually develop this fault. Revision B (2005-2006) is a gamble, while revision C and later are considered reliable. The revision letter is stamped on the head and can be checked. Symptoms include unexplained coolant loss with no visible external leak, white sweet-smelling exhaust smoke on warm restart, and occasionally a rough idle. The only proper fix is cylinder head replacement, costing €1,200-2,500 including gasket set, head bolts, and labour. Always insist on a revision C or later replacement. This issue does not affect the 2008+ common-rail CBAB engines. Check which head revision is fitted before buying any BKD-engined car.
Turbocharger actuator sticking
€350 - 2,0002 of 8
Variable-geometry vanes stick from carbon deposits, causing limp mode and loss of power · more· less
The variable-geometry turbocharger (VNT) uses movable vanes controlled by a vacuum or electronic actuator. Carbon deposits cause these vanes to stick, resulting in overboosting, underboosting, or limp mode with the EPC warning light. The problem is most common on cars used primarily for gentle city driving, as the turbo never reaches sufficient temperature to burn off deposits. Actuator-only repair at a diesel specialist costs approximately €350-500. If the turbo internals are damaged from prolonged sticking, a reconditioned turbo costs €500-900 plus fitting, while a new OEM turbo at an Audi dealer runs €1,500-2,000 installed. Regular motorway driving at higher RPM helps prevent the issue. The 140 hp variant is slightly less stressed than the 170 hp version.
DPF clogging (BMM and CBAB engines)
€300 - 1,5003 of 8
Diesel particulate filter blocks from repeated short trips that prevent regeneration · more· less
Cars with the BMM engine code (late PD with DPF, from 2006) and all CBAB common-rail engines have a diesel particulate filter. Short trips at low speeds prevent the exhaust from reaching the 350-500 degrees needed for passive regeneration, and the active regeneration that follows needs 600-650 degrees held long enough to complete. Failed active regeneration attempts lead to progressive soot accumulation, eventually blocking the filter. Symptoms include reduced power, increased fuel consumption, and the DPF warning light. A forced regeneration via diagnostic tool costs €50-100 and often resolves mild cases. Professional DPF cleaning costs €200-400. Full replacement costs €800-1,500. The earlier BKD engine without DPF avoids this issue entirely. Check DPF soot loading with VCDS before purchase — anything above 50% is a concern.
EGR valve carbon buildup
€200 - 8004 of 8
Carbon deposits restrict the EGR valve, causing rough running and reduced performance · more· less
The exhaust gas recirculation valve accumulates carbon deposits over time, particularly on cars used for short journeys or urban driving. The EGR valve on the 2.0 TDI is located underneath the intake manifold, making access difficult and increasing labour costs. Symptoms include rough idle, hesitation under acceleration, increased smoke, and the engine management light. Cleaning the valve can resolve the issue temporarily for €100-200 in labour. A new EGR valve costs €200-400 for the part plus €150-300 in labour at an independent garage. At an Audi dealer, the total can reach €600-800 due to the valve's awkward location. Regular motorway driving helps keep the valve cleaner.
PD fuel injector wear (BKD/BMM engines)
€400 - 2,0005 of 8
Pumpe Düse injectors develop internal wear, causing rough idle, misfires, and poor starting · more· less
The Pumpe Düse (unit injector) system in the BKD and BMM engines can develop injector failures over time. Symptoms include rough idle, misfiring on one or more cylinders, poor cold starting, and uneven running. Having injectors tested and recalibrated at a diesel specialist costs approximately €150-200 and can resolve mild symptoms. Full injector replacement runs €100-150 per injector for quality remanufactured units plus labour, or €250-400 per injector for new OEM parts. Replacing all four with labour typically costs €1,200-2,000 at a dealer, or €600-1,000 at an independent specialist. The CBAB common-rail engine uses different injectors and is not affected by this specific issue.
Tandem pump diaphragm failure (PD engines)
€350 - 8006 of 8
Internal seal fails, allowing diesel to contaminate engine oil or causing vacuum loss for the brake servo · more· less
The tandem pump on PD TDI engines serves dual functions: it provides fuel lift pressure and vacuum for the brake servo. When the internal diaphragm fails, diesel fuel leaks into the engine oil (identifiable by rising oil level and a diesel smell on the dipstick) or vacuum is lost, leading to a hard brake pedal. If not caught early, diesel dilution thins the oil and can cause premature camshaft and bearing wear. A replacement tandem pump costs €200-400 for the part with €100-200 in labour. Updated pumps with improved seals are available. Check the oil level and smell regularly — if the level rises between changes or smells of diesel, investigate immediately. This issue does not apply to the 2008+ common-rail engines.
Dual mass flywheel wear
€800 - 1,4007 of 8
Internal springs weaken from diesel torque pulses, causing rattling at idle and judder on take-off · more· less
The dual mass flywheel absorbs torsional vibrations from the diesel engine. Over time, particularly with frequent stop-start driving, the internal springs weaken or break. Symptoms include a rattling or knocking noise at idle that disappears when the clutch is depressed, juddering when pulling away in first gear, and vibration through the drivetrain. The DMF is typically replaced together with the clutch as a complete kit. A combined DMF and clutch kit (LUK or Sachs) costs €350-550 for parts, with €400-800 in labour. Most DMF failures occur between 130,000-200,000 km. Premature failure can result from aggressive driving or frequent stop-start use.
Window regulator cable snapping
€100 - 2508 of 8
Plastic guide clips break and cables snap, causing the window to drop into the door · more· less
The electric window regulators on the A3 8P use plastic guide clips and cable mechanisms that become brittle with age and temperature cycling. When they break, the window drops into the door cavity or moves erratically. The driver's door is most commonly affected. This is a well-known PQ35 platform issue affecting all variants. Aftermarket replacement regulators cost €30-60 per unit plus 1-2 hours of labour. OEM parts run €100-130 per door. The repair is straightforward for an independent garage. Multiple failures on the same car are common over the ownership period.
Reliable diesel with well-understood weak points
The 2.0 TDI in the A3 8P is a fundamentally robust engine across both PD and common-rail generations, with many high-mileage examples exceeding 250,000 km. The most significant variable is which engine variant is fitted: early BKD engines (2003-2005) with revision A cylinder heads carry the highest risk, while revision C and later, as well as all 2008+ CBAB common-rail engines, are considerably more reliable. Beyond the cylinder head, most issues are typical diesel ageing problems — EGR clogging, turbo actuator sticking, and DPF blockage on short-trip cars. The A3 8P avoids the balancer shaft oil pump problem that affects the same 2.0 TDI in the A4 B7, making it a lower-risk proposition. Regular oil changes with the correct specification and avoiding long-life intervals are essential.
Service history
Complete Audi dealer or VAG specialist records essential. Verify oil was changed every 10,000-15,000 km with VW 507.00 or 505.01 spec oil, not on longlife intervals (30,000 km).
Tires
Check tread depth, age (date codes on sidewall), and uneven wear indicating alignment or suspension issues.
Cold start
Start the engine completely cold. Listen for knocking or rattling in the first 30 seconds, and check for white exhaust smoke.
Test drive
Drive for at least 20 minutes including motorway speeds. Check for smooth power delivery, turbo boost response, and gear changes.
Specific for this vehicle
Check cylinder head revision (BKD engine)
The revision letter is stamped on the head (03G 103 308 followed by A, B, or C). Revision A is very prone to porosity, B is uncertain, and C or later is reliable. This is the most important check on a BKD-engined car.
Check for white exhaust smoke on warm restart
Start the engine when warm and let it idle. White sweet-smelling smoke indicates coolant entering combustion chambers through a porous cylinder head.
Test oil level and smell for diesel contamination
If the oil level has risen above the max mark or smells of diesel, the tandem pump diaphragm has failed (PD engines only). Check immediately.
+ 5 more checksShow less
Scan for fault codes with VCDS
Use VAG-COM/VCDS to check all modules. Pay particular attention to turbo actuator codes, injector balance values, and DPF soot loading (if equipped). Above 50% soot loading is a concern.
Test turbo boost under full load
Accelerate firmly in 3rd gear from 2,000 rpm. The car should pull strongly and smoothly. Hesitation, surging, or limp mode indicates turbo actuator or boost leak issues.
Test all window regulators
Operate all four windows fully up and fully down. Listen for grinding or slow movement indicating worn regulators.
Verify timing belt replacement history
There is no single interval across this engine range: Audi sets it per engine, with examples such as 150,000 km on the later BKD and 180,000 km on the CBAB. Check the figure for the exact engine code, and if no documented replacement exists near or past it, budget €500-800.
Verify Dieselgate recall status (2008+ CBAB engines)
Common-rail EA189 engines were subject to the emissions software recall. Check with Audi using the VIN whether the update was applied and whether any post-update issues were addressed.
Fuel injector line vibration cracking (campaign 23J8, common-rail 2.0 TDI model years 2009-2011)Verify completed
ABS/ESC control unit software update (campaign 45F5, A3 8P model years 2009-2010)Critical - verify completed
Injector campaign NCA/2011/018 (170 hp Pumpe Düse, BMN engine)Verify completed
Takata airbag inflator replacement (2006-2013 model years)Verify completed
Contact Audi with the VIN to verify all recalls have been completed. The Dieselgate emissions recall only affects 2008+ common-rail EA189 engines (CBAB/CBBB), not the earlier PD engines (BKD/BMM). The Takata airbag recall is safety-critical and Audi lists its A3 scope as model years 2006-2013. The fuel injector line campaign 23J8 affects common-rail model years 2009-2011, campaign 45F5 covers the ABS/ESC control unit on 2009-2010 cars, and NCA/2011/018 is the injector action relevant to the 170 hp BMN.
Warranty Status
Factory warranty (2 years)Expired on all A3 8P models
Rust perforation warranty (12 years)Expired on all but the very last models (2012/2013)
Extended warrantyNot available from Audi for cars this age
All A3 8P models are well outside their original 2-year factory warranty. Audi's 12-year rust perforation warranty has expired on nearly all models. No factory extended warranty is available for vehicles of this age. Third-party warranty providers may offer coverage but typically exclude vehicles over 12 years old.
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.
