IsItAGoodCar
Reliability Guide

Common Problems with the
2009–2011 Audi A4 Mk4 (B8)

We've identified 7 known issues that can affect the 2009–2011 Audi A4 Mk4 (B8). 4 of these are serious faults that could be expensive to repair.

7
Known Issues
4
Serious
3
Moderate
0
Minor

All Known Issues

Excessive Oil Consumption (EA888 Gen 2)

SeriousEngine

Faulty piston rings on early EA888 engines (CDNB, CDNC codes) cause severe oil burning as carbon blocks the thin oil control rings.

Est. Repair Cost: £3,000–£5,000
Warning Signs:

Needs frequent top-ups (more than 0.5L per 1,000 miles), Blue smoke after overrun, Sooty tailpipes

What to Inspect:
  • Ask if the "Stage 2" fix (pistons and rods) has been done
  • Check for spare oil bottles in the boot
  • Check for recent catalyst or spark plug replacements
Verified by IsItAGoodCar Research Team

Multitronic CVT Failure

SeriousGearbox & Transmission

Front-wheel-drive automatics use the Multitronic CVT which can judder, flare or lose drive if fluid changes were skipped or the control unit fails.

Est. Repair Cost: £1,000–£2,500
Warning Signs:

Rev flare under acceleration, Judder pulling away, Flashing PRNDS warning

What to Inspect:
  • Drive from cold and warm in stop-start traffic
  • Ask for fluid-change invoices
  • Prefer quattro S tronic or manual if history is patchy
Verified by IsItAGoodCar Research Team

Timing Chain Tensioner Failure

SeriousEngine

Pre-2013 EA888 Gen 1 and Gen 2 engines have a plastic timing chain tensioner that can fail, causing chain slack and potential engine destruction.

Est. Repair Cost: £900–£1,800
Warning Signs:

Rattle for a few seconds on cold start, Timing correlation fault codes, Harsh idle or non-start if chain jumps

What to Inspect:
  • Insist on a genuine stone-cold start
  • Look for upgraded tensioner invoices
  • Scan for P0016 timing faults
Verified by IsItAGoodCar Research Team

DL501 S tronic Mechatronic / Clutch Faults

SeriousGearbox & Transmission

The DL501 can develop control and clutch faults that cause harsh engagement or loss of gears. Confirm the transmission code rather than applying this warning to Multitronic or Tiptronic cars.

Warning Signs:

Jerky pull-away, Missing reverse or gearbox warning

What to Inspect:
  • Test low-speed shifts both cold and warm
  • Ask for fluid-service history and specialist fault diagnosis
Verified by IsItAGoodCar Research TeamUpdated

Water Pump / Thermostat Housing Leak

ModerateCooling System

The plastic water pump and thermostat housing warp and leak coolant, a well-known weakness across the EA888 range. Some cars fail twice before 100k miles.

Est. Repair Cost: £350–£750
Warning Signs:

Low coolant warning, Pink crust near housing, Sweet smell after shutdown

What to Inspect:
  • Inspect around the pump and housing
  • Verify coolant level from cold
  • Check for recent cooling-system work
Verified by IsItAGoodCar Research Team

Electric Steering Lock Failure

ModerateElectrics & Electronics

The electronic steering column lock (ELV) module can fail, preventing the car from starting or unlocking the steering. A known weak point on B8 cars.

Est. Repair Cost: £300–£800
Warning Signs:

Steering remains locked, Car will not start, Steering lock warning message

What to Inspect:
  • Test steering lock/unlock cycle
  • Check for steering lock fault codes
  • Ask if ELV module has been replaced
Verified by IsItAGoodCar Research Team

TDI EGR Faults / DPF Regeneration Problems

ModerateExhaust & Emissions

EGR faults and unsuccessful DPF regeneration can cause reduced performance. DPF equipment varies on older diesels; confirm fitment and diagnose the cause before assuming that cleaning will solve it.

Warning Signs:

Emissions warning, Reduced power or frequent regeneration

What to Inspect:
  • Review driving pattern and emissions-repair history
  • Request EGR operation and DPF pressure/soot-load checks
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2009–2011 Audi A4 Mk4 (B8)

  • ✓CRITICAL: monitor the oil level on pre-2012 2.0 TFSI cars and expect proof of piston-ring work
  • ✓Listen for timing-chain rattle on petrol models after an overnight rest
  • ✓Check steering weight and self-centering carefully
20082012
Check a 2009–2011 Audi A4 Mk4 (B8) by Registration