Audi A4 common problems & fixes (B8 2008–2015, B9 2015–2024)
Written by the C4R team from DVSA data and owner reports. Fact-checked 2026-10-04.
The 30-second verdict
Most used A4s in the UK are diesels, and a well-serviced 2.0 TDI is a sensible, long-legged motorway car. The one to be careful with is the early B8 2.0 TFSI petrol (about 2008–2012), which is known for heavy oil consumption. Also check that the 2.0 TFSI coolant pump recalls and the airbag recall have been done, and avoid a B8 Multitronic automatic unless you have proof of care. Late B8 (2013–2015) and the B9 are the safer bets.
Generations at a glance
| Generation | Years (UK) | Main engines | Gearboxes | Notes |
|---|---|---|---|---|
| B8 (8K) | 2008–2015 | 1.8/2.0 TFSI petrol, 2.0 TDI (CR), 2.7/3.0 TDI | Manual, Multitronic CVT, S tronic dual-clutch | Facelift 2012 ("B8.5") |
| B9 (8W) | 2015–2024 | 1.4/2.0 TFSI, 2.0 TDI, 3.0 TDI | Manual, S tronic, tiptronic | Renamed A5 from 2024 |
Known issues
1. Oil consumption — early 2.0 TFSI (and 1.8 TFSI)
- Label: Manufacturer known issue; widely reported by owners
- What you notice: oil warning between services, blue-grey smoke, needing a litre every few hundred to a thousand miles.
- Years/engines: B8 1.8/2.0 TFSI (EA888 second generation), roughly 2008–2012.
- Why: piston ring design lets oil past.
- Fix: revised pistons and rings, or engine replacement. Cost: £2,000–£4,000 (typical UK independent garage, 2026).
- DIY difficulty: 5/5.
- Check when buying: ask about top-ups, look for smoke, and consider a compression/leak-down test before buying.
2. Timing chain tensioner — TFSI petrol
- Label: Reported by owners
- What you notice: rattle on a cold start; in the worst case the chain jumps and the engine is damaged.
- Years/engines: B8 TFSI, often alongside the oil-burning engines.
- Fix: chain, tensioner and guides. Cost: £800–£1,500 (typical UK independent garage, 2026).
3. Carbon build-up on intake valves — TFSI petrol
- Label: Reported by owners
- What you notice: misfires, rough idle, flat spots, often from around 50,000 miles.
- Why: direct injection means fuel never washes the intake valves.
- Fix: walnut-blast clean. Cost: £300–£600 (typical UK independent garage, 2026).
4. Multitronic CVT faults — B8 automatic (front-drive)
- Label: Reported by owners
- What you notice: judder pulling away, slipping, warning lights.
- Fix: fluid service, control unit or full rebuild. Cost: £250–£400 for fluid; £1,500–£3,000 for a rebuild (typical UK independent garage, 2026).
- Check when buying: quattro cars use a conventional auto instead; B9 dropped the CVT.
5. DPF, EGR and emissions fix — 2.0 TDI
- Label: Reported by owners
- What you notice: warning lights, limp mode, frequent regenerations.
- Background: some early B8 2.0 TDI engines (EA189) received the emissions software fix after the 2015 diesel scandal; ask if it's been applied.
- Fix: DPF clean or replacement, EGR clean. Cost: £150–£1,200 depending on parts (typical UK independent garage, 2026).
Recalls
| Ref / campaign | Concern (C4R summary) | Applies to |
|---|---|---|
| May 2017 campaign | Debris can block the auxiliary coolant pump, which can overheat and, rarely, catch fire | B8 2.0 TFSI, 2011–2015 |
| June 2018 campaign (19N3) | Moisture in the same auxiliary coolant pump can cause overheating | B8 2.0 TFSI, 2011–2015 |
| Oct 2014 campaign | Airbag control software update — front airbags may not inflate correctly | B8 built Nov 2011–Oct 2014 |
| R/2017/078 | Airbag and/or seatbelt pretensioner may not trigger | B9 A4s built May–October 2016 (part of a 2,600-car Audi campaign) |
Check every car on the GOV.UK recall checker.
MOT watch-points
What the 2024 DVSA figures say
- First-time pass rate: 72.8% from 255,207 normal Class 4 and 7 Audi A4 tests.
- National comparison: 71.5% across the same 2024 dataset, so this model was 1.3 percentage points above the national first-time pass rate.
- Typical tested mileage: median 99,328 miles; mean 103,974 miles.
Most common recorded failure reasons
| DVSA failure reason | Tests | Share of this model's tests |
|---|---|---|
| Coil spring: fractured or broken | 9,002 | 3.5% |
| Tread depth: tread depth below requirements of 1.6mm | 8,381 | 3.3% |
| Joints: constant velocity boot split or insecure, no longer prevents the ingress of dirt | 7,332 | 2.9% |
| Malfunction indicator lamp: inoperative or indicates a malfunction | 5,973 | 2.3% |
| Pins and bushes: pin or bush excessively worn | 5,298 | 2.1% |
One test can record more than one defect, so the shares must not be added together.
Common advisories to check before buying
- Tread depth: worn close to legal limit/worn on edge — recorded on 21.5% of tests.
- Pins and bushes: pin or bush worn but not resulting in excessive movement — recorded on 13.4% of tests.
- Brake pads: wearing thin — recorded on 8.2% of tests.
Method and limits: C4R calculated these figures from DVSA's anonymised 2024 MOT results. Pass rate is P / (P + F + PRS) for normal Class 4 and 7 tests. Results are de-duplicated by test, low-volume rows are suppressed, and DVSA model labels are standardised into a model family. These figures describe tested cars as a group; they do not predict the condition of one vehicle or prove that every trim and generation performs the same way.
DVSA anonymised MOT tests and results · Open Government Licence v3.0
Contains public sector information licensed under the Open Government Licence v3.0. Source: DVSA anonymised MOT tests and results, 2024.
Pre-MOT checks: front suspension arms (the multi-link front end wears bushes), tyres, brake discs, emissions on diesels and any warning lights.
Buying one? Our checklist
- On an early TFSI, ask about oil use and check for smoke.
- Confirm both coolant pump recalls and the airbag recall are closed.
- Cold-start for chain rattle on petrols.
- On a Multitronic, test for judder; walk away without history.
- On diesels, check DPF behaviour and whether the emissions fix was done.
- Listen for knocks from the front suspension over bumps.
- Check the service was done on time, not stretched to "long life" intervals on a high-mileage petrol.
- Test the MMI screen and all electrics.
Sources & further reading
- GOV.UK — Check if a vehicle has been recalled
- AUTODOC — Audi A4 years to avoid
- AudiWorld — A4 B8 oil consumption information
- Australian Car Reviews — Recalls and faults: Audi B8 A4
- The Drive — Audi coolant pump recall
- Wikipedia — Audi A4
Contains public sector information licensed under the Open Government Licence v3.0.
Costs are estimates for a typical UK independent garage in 2026; always get a quote.