Problems with the Audi A4 B8
Audi A4 B8 experiences: common faults, typical problems and weak points of the model
- 2.0 TDI oil pump problem: A critical defect in the Audi A4 B8 oil pump often occurs at mileages of 120,000-150,000 km or more, leading to engine damage.
- 1.8 TFSI oil consumption: The 1.8 TFSI engine (120 hp and 160 hp) tends to consume excessive amounts of oil (up to 1 liter/1,000 km) from 80,000 km.
- Multitronic gearbox problems: Pre-series CVT gearboxes (model years up to 2011) frequently exhibit jerking or failures from 150,000-180,000 km.
- Central locking and door locks: Defective door locks and central locking control units occur more frequently in vehicles with 100,000 km or more.
Audi A4 B8: Problems with the 2.0 TDI and oil pump failure
The 2.0 TDI engine (150 hp and 177 hp) in the Audi A4 B8 often suffers from oil pump and timing chain problems. Failure of the oil pump leads to a lack of oil and drastic engine damage within a few minutes. Affected models are usually from the 2008-2012 model years, with the first symptoms such as warning lights (oil pressure) or metallic noises appearing from 120,000 km. Diagnostic codes such as P1512 or P0299 indicate a loss of pressure.
Professional maintenance is vital for the 2.0 TDI engine. The sensitive Audi A4 B8 oil pumps require early replacement (at 140,000 km at the latest) and only original parts. Regular oil pressure measurements (minimum pressure: 2.0 bar at 2,000 rpm) and the use of certified 5W-40 oil drastically reduce the risk.
Audi A4 B8: 1.8 TFSI oil consumption and piston rings
The 1.8 TFSI engine (120 hp, 160 hp and 170 hp) in the Audi A4 B8 often develops increased oil consumption (up to 1.5 liters/1,000 km) from 60,000-80,000 km. This is caused by worn piston rings or defective valve guides. Symptoms such as blue exhaust gas or oil residue on the exhaust are warning signs. For models up to 2011, engine overhauls were documented in 23% of cases.
A systematic check of the compression values (target: 12-14 bar per cylinder) is crucial. The susceptible Audi A4 B8 piston rings require replacement if oil consumption exceeds 0.5 liters/1,000 km. Retrofit kit solutions with reinforced rings reduce the problem in the long term.
Audi A4 B8: Multitronic transmission (CVT) and shifting problems
The Multitronic transmission (type 0AW) in the Audi A4 B8 frequently exhibits jerking, imprecise shifting or complete failure from 150,000 km. The pre-production versions up to 2011 in particular have a high failure rate - 18% of owners report transmission problems. Typical error codes such as P1890 (clutch wear) or P1740 (pressure regulator) indicate internal wear.
A professional inspection of the oil level and quality (change interval: 60,000 km) is vital. The complex Audi A4 B8 Multitronic gearboxes require special diagnostic systems such as VAS 5054A for software updates. At the first symptoms, we recommend replacing the control unit or the clutch packs.
Audi A4 B8: Electrical and sensor problems
Electrical problems and sensor faults are not uncommon in the Audi A4 B8, especially over time. These can lead to warning lights on the dashboard, malfunctioning electronic systems and reduced engine performance.
A systematic check is essential to detect these problems at an early stage. The sensitive Audi A4 B8 sensors and electrical systems require regular checks and, if necessary, replacement of defective components to ensure optimal function. Professional maintenance can help prevent major damage and ensure the reliability of the vehicle.
Audi A4 B8: Defective central locking and door locks
The electric central locking system in Audi A4 B8 often reacts unreliably after 100,000 km. Typical symptoms are jammed door locks, malfunctions of the electric tailgate or spontaneous unlocking. Defective door contact switches or control units (control unit J393) are usually responsible. According to forum reports, these faults occur in 15-20% of models built up to 2012.
Regular cleaning of the door locks with contact spray prevents corrosion. The sensitive Audi A4 B8 door locking systems require the replacement of defective actuators (approx. 2-3 hours of work per door) and software resets via ODIS.
Audi A4 B8: High pressure pump problems
The high-pressure pumps in the Audi A4 B8, especially in models with direct injection, can fail. A defective pump motor can result in the engine not running properly or not starting at all.
A professional inspection is required to identify and rectify these problems. Audi A4 B8 high pressure pumps require regular checks to ensure they are working correctly. Professional maintenance can help prevent major damage and ensure engine reliability.
Audi A4 B8: air conditioning failure and compressor damage
Air conditioning problems in Audi A4 B8 manifest themselves from 60,000-80,000 km through reduced cooling capacity or complete functional failure. The main causes are leaking condensers (often caused by stone chips) or defective compressors (Sanden or Denso types). Measurements of the refrigerant pressure (target: 28-35 psi at 20 °C) and inspections of the high-pressure switch are critical.
A professional A/C service with UV leak detection identifies leaks. The precise Audi A4 B8 air conditioning components require servicing every 2 years. Replacement intervals for the compressor are 120,000-160,000 km.
Audi A4 B8: Timing chain tensioner problems
The timing chain tensioners in the Audi A4 B8 can fail, which can lead to serious engine damage. A faulty tensioner can cause the chain to become loose or even jump teeth, which can have catastrophic consequences for the engine.
Regular maintenance is crucial to detect these problems at an early stage. The delicate Audi A4 B8 timing chain tensioners require regular checks to ensure that the chain is correctly tensioned. Professional maintenance can help prevent major damage and ensure the longevity of the engine.
Additional common defects of the Audi A4 B8
Based on customer feedback and workshop statistics, the following problems also occur:
- Defective parking aid (control unit J791): From 80,000 km, often due to moisture-filled sensors.
- High-pressure pump failure (2.0 TFSI): Affects engines up to 2011 at 100,000-130,000 km.
- Start-stop malfunctions: Often caused by a weak Audi A4 B8 battery (capacity 60 Ah) from 5 years of use.
- TPMS sensor failures: Tire pressure monitoring systems report faults from 70,000 km, especially in winter.
- Injector coking (2.0 TDI): From 120,000 km due to sulphur deposits, cleaning recommended every 40,000 km.
- Electric tailgate malfunction: Hydraulic cylinder or control cable break from 90,000 km.
Audi A4 B8: weaknesses and strengths
| Strengths |
Weak points |
| High-quality interior |
2.0 TDI oil pump defects |
| Precise chassis |
1.8 TFSI oil consumption |
| Long service life with 3.0 TDI |
Multitronic gearbox problems |
| Good crash safety |
Air conditioning compressor failures |
| Economical 2.0 TDI 150 PS variant |
Central locking defects |
| Reliable 2.0 TFSI engines from 2012 onwards |
Electric tailgate faults |
| Good availability of spare parts |
Frequent TPMS sensor failures |
The Audi A4 B8 impresses with its value and driving pleasure, but requires strict maintenance intervals. Critical components such as the oil pump, gearbox and door lock should be monitored intensively from 100,000 km. With preventive measures and prompt repairs, the A4 B8 remains a reliable companion.
27 March 2025 
