Audi A3 8P 2.0 TDI 140bhp PD — Porous Cylinder Head (BKD Engine)
Early 2.0 TDI 140bhp engines (engine code BKD) suffered from porous cylinder heads, causing coolant to leak directly into the combustion chambers or oil ways.
Severity
CriticalDIY Difficulty
Professional Only
Est. Cost
£1200–£2000
OBD Codes
None
Cooling
Typical layout and location for the Cooling assembly.
Symptoms
- Unexplained coolant loss with no external leaks
- Hard starting in the morning
- White smoke on cold start
- Mayonnaise under the oil cap
Root Cause
A manufacturing defect in the casting of the cylinder head on early BKD engines allowed micro-cracks to form. Coolant slowly seeps into the cylinders when the engine cools down overnight.
How To Fix
- Pressure test cooling system overnight
- The only fix is a replacement cylinder head (revision 'C' heads are safe)
- Very expensive repair: often writes off an older car
- Cost: £1,200 - £2,000
Estimated Repair Costs
| Repair Option | Est. Cost (GBP) |
|---|---|
| DIY (parts only) | £480–£800 |
| Independent Garage | £1200–£2000 |
| Main Dealership | £1920–£3200 |
Other Faults on This Variant
Flywheel / DMF Shudder
ModerateLike the Golf Mk5, the A3 2.0 TDI consumes Dual Mass Flywheels. Worn DMFs cause significant vibration and require complete replacement.
High Pressure Fuel Pump Cam Follower Wear
CriticalThe same critical cam follower issue as the Golf Mk5 — the HPFP cam follower wears through to the camshaft. A £15 inspection and part replacement prevents a £2,500 camshaft repair.
Oil Pump Balancer Shaft Failure
CriticalSome 2.0 TDI PD engines suffer from a catastrophic failure of the oil pump hex drive, leading to immediate oil starvation and engine destruction.
Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.