Toyota Corolla Mk9 1.4 D-4D 90bhp Known Faults
1.4 D-4D 90bhp2004–2007DieselManualHatchback2 known faults
Toyota's diesel Corolla. Generally reliable but DPF and injector issues affect higher-mileage examples.
What To Check Before Buying
- ✓Check service history — was oil changed regularly?
- ✓Look for blue/black smoke on startup and under load
- ✓Listen for rattles, knocking, or turbo whine
- ✓Test all electrics including windows, AC, and central locking
- ✓Check for DPF warning light or recent regenerations
- ✓Inspect for rust underneath and around wheel arches
- ✓Request a pre-purchase inspection by an independent mechanic
Known Faults
DPF Blockage and Injector Fouling
Moderate2004-200760,000–130,000 miles£150–£700
The Corolla Mk9 diesel is generally reliable, but DPF blockage affects city-driven examples and injector fouling occurs at high mileage. Toyota quality means these are manageable issues.
EGR Valve Failure
Moderate2004-200780,000–150,000 miles£150–£450
EGR failure on the Corolla Mk9 diesel causes power loss and rough running. While Toyota quality means the EGR lasts longer than European equivalents, it is still a wear item.
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