What is the Head Gasket Failure (2.5L Petrol) problem on a 2003 Subaru Outback Mk3 (BP)?

Common Problems with the
2003–2007 Subaru Outback Mk3 (BP)

We've identified 1 known issue that can affect the 2003–2007 Subaru Outback Mk3 (BP). 1 of these are serious faults that could be expensive to repair.

Known Issues

Serious

Moderate

Minor

The 2003–2007 period has an average number of reported issues compared to other Subaru Outback Mk3 (BP) year periods.

All Known Issues

Head Gasket Failure (2.5L Petrol)

SeriousEngine

While slightly improved, the 2.5L petrol still suffers from external head gasket leaks that eventually require an engine-out repair.

Most affected: 2.5i Petrol

Estimated cost: £1,200–£2,000Affects: 2003–2009Often appears around: 100,000+ miles

Typical symptoms

•Oil leaking onto exhaust (smell of burning oil)
•Coolant loss
•Overheating

What to inspect before you buy

✓Inspect the underside of the engine for leaks
✓Look for bubbles in the expansion tank

Buying Tips for the 2003 Subaru Outback Mk3 (BP)

✓Treat early Boxer Diesel (2.0D) models with extreme caution; they are prone to catastrophic crankshaft failure.
✓Check the operation of the self-levelling rear suspension; if it sags, it is expensive to fix with genuine parts.
✓Listen for front CV joint clicking on full lock, as the boots often split and let in grit.

2008–2009 Subaru Outback Mk3 (BP)