Generations
B7 — B7 (Typ 8E/8H)
2005–2008
1.8 Turbo, 1.9 TDI PD, 2.0 FSI, 2.0 TFSI, 2.0 TDI, 2.4 V6
B8 — B8 (Typ 8K)
2008–2015
1.8 TFSI, 2.0 TDI, 2.0 TFSI, 2.0 TDI, 3.0 TDI V6, 3.0 TFSI V6
B9 — B9 (Typ 8W)
2016–2023
1.4 TFSI, 2.0 TFSI, 2.0 TDI, 2.9 TFSI V6, 3.0 TDI V6, 3.0 TFSI V6
Top issues to watch for
The most serious Audi A4 problems ranked by severity. We track 20 known issues — here are the ones you need to know about first.
The oil pump drive on B7 1.9 TDI PD engines uses a hex bolt that can shear without warning, causing complete loss of oil pressure and catastrophic engine failure within seconds. This is a well-documented failure mode specific to the PD injection system's high mechanical loads. The updated bolt has a different part number but many cars still have the original failure-prone component. Engine rebuild costs typically exceed the car's value, making this a walk-away issue without documented bolt replacement.
What happens if ignoredComplete engine failure occurs within minutes if the bolt shears while driving. The engine seizes due to oil starvation, requiring a full rebuild costing £8,000-£15,000. Recovery is required as the car cannot be driven. No warning is given before failure occurs.
Independent garage
£1,500–£3,000
The high-pressure fuel pump cam follower on B7 2.0 TFSI engines wears through due to inadequate hardening, destroying the camshaft lobe beneath it. This is the most extensively documented failure mode on EA113 engines, with the follower acting as a sacrificial component. Once the follower wears through, metal debris contaminates the oil system and the camshaft requires replacement. Upgraded followers are available but many cars still have the original component.
What happens if ignoredComplete camshaft replacement is required once the follower wears through the lobe surface. Repair costs £2,000-£4,000 including labour for camshaft replacement and timing chain service. Metal debris may contaminate the oil system requiring additional engine internal cleaning. The car should not be driven with confirmed cam follower failure.
Independent garage
£200–£600
The Multitronic CVT transmission is notoriously unreliable with widespread failures affecting the steel belt, pulleys, and control systems. Unlike a conventional automatic, this transmission cannot be meaningfully repaired and requires complete replacement when it fails. Symptoms include jerking, slipping, and complete loss of drive. Many specialists refuse to work on Multitronic transmissions due to poor reliability. B8 generation cars with Multitronic should also be avoided.
What happens if ignoredComplete transmission replacement is required when the CVT fails. Replacement transmissions cost £3,000-£5,000 fitted. No economical repair options exist for internal CVT damage. The car cannot be driven safely once slipping occurs as power delivery becomes unpredictable.
Independent garage
£2,000–£4,000
The balance shaft oil pump chain can fail on 2008-2012 diesel models, similar to the hex bolt issue on B7 PD engines. When the chain breaks, oil pressure drops to zero causing catastrophic engine failure within minutes. This affects the oil pump drive to the balance shaft module and is most common on CAGA and CJCA engine codes. The failure occurs without warning and typically results in engine replacement rather than repair.
What happens if ignoredComplete engine failure occurs rapidly once the oil pump chain breaks. The engine seizes due to oil starvation requiring replacement or complete rebuild costing £5,000-£10,000. The car cannot be driven once oil pressure is lost. Recovery is required immediately.
Independent garage
£1,500–£3,000
16 more known issues tracked
Including further major faults, wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.
Check a specific car →
MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Audi A4 fails at a significantly higher rate than the average car.
Fluid leak
Suspension · 40-60k miles
MOT failure rate: 693x the fleet average
Sample: 2,734 tests
Emissions failure
Exhaust & Emissions · 40-60k miles
MOT failure rate: 177x the fleet average
Sample: 392 tests
Brake hoses perished or damaged
Brakes · 20-40k miles
MOT failure rate: 71x the fleet average
Sample: 699 tests
Coil springs broken
Suspension · 0-20k miles
MOT failure rate: 69x the fleet average
Sample: 14,665 tests
Rear registration plate lamp or light source mi...
Lights & Electrics · 40-60k miles
MOT failure rate: 47x the fleet average
Sample: 1,065 tests
Wheel with a loose or missing wheel nut, bolt o...
Wheels · 0-20k miles
MOT failure rate: 42x the fleet average
Sample: 458 tests
Technical service bulletins & recalls
Official manufacturer notices issued to dealerships. If a car hasn't had recall work done, it needs doing — check with the dealer network.
24-51
EA888 Gen1/2 Oil Consumption - Piston Ring Replacement
Acknowledged excessive oil consumption on 2009-2012 EA888 engines with CAEB/CCTA codes. Warranty extension for piston ring replacement up to 100,000 miles or 10 years. Check oil consumption rate and service history documentation.
B8 · EA888 · Issued: 2012-08
24-11-02
Timing Chain Tensioner Update
Updated timing chain tensioner design to address premature failure and chain stretch. Revised service procedure includes timing verification. Check for updated tensioner part numbers and timing chain service history.
B8 · EA888 · Issued: 2013-03
Buying a Audi A4?
Check a specific car's service history to see if it's been looked after — franchised dealer records with dates, mileage, and work done.
Check service history
£6.99 · Full refund if no records found
Audi A4 reliability FAQs
What are the most common problems with the Audi A4?
The Audi A4 has 20 known issues across 4 severity levels. The most serious are: Oil pump drive hex bolt failure (B7), Cam follower failure from HPFP (B7), Multitronic CVT gearbox failure (B7).
Is the Audi A4 reliable?
The Audi A4 has 7 dangerous and 7 major known issues. This is a higher number than average — careful pre-purchase inspection is essential.
How much does it cost to fix Audi A4 problems?
Repair costs range widely. The most significant issue (Oil pump drive hex bolt failure (B7)) costs £1,500–£3,000 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.
Which Audi A4 generation is most reliable?
The B9 (2016–2023) has the fewest dangerous issues (0). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.