1.7 CDTi (Z17DTH / A17DTJ, Isuzu)
2004–2010 · diesel · 1686cc · 110hp
Engine codes: Z17DTH, A17DTJ, Z17DTR
Reliability, common problems and owner reviews for the Opel Astra H 1.7 CDTi (Z17DTH / A17DTJ, Isuzu). Check this before you buy used.
The Isuzu-derived 1.7 diesel — a tough, long-serving design widely regarded as the more robust diesel choice here. The main wear point is the turbocharger (loss of power, black smoke, whistle, often from ~100,000 km); EGR/DPF on later cars. Solid with maintenance.
Same engine, other cars
This is the same physical engine (A17DTS) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
Turbo wears from ~100,000 km — power loss, black smoke, whistle.
Fix / Workaround: Rebuild/replace turbo; check oil feed.
Repair cost: €400–€1000
Typically appears after: 100,000 km
EGR clogs; DPF blocks on short trips.
Fix / Workaround: Clean EGR; motorway runs for DPF.
Repair cost: €150–€700
Mileage Thresholds
After 100,000 km: Turbo wear window.
Pre-Purchase Checklist
- ☐Check turbo on test drive (smoke/whistle/power)
- ☐EGR/DPF history
- ☐The more robust diesel vs the 1.9 CDTi
Frequently asked questions
Is the Opel Astra H 1.7 CDTi (Z17DTH / A17DTJ, Isuzu) reliable?
Maint. Sensitive — The Isuzu-derived 1.7 diesel — a tough, long-serving design widely regarded as the more robust diesel choice here. The main wear point is the turbocharger (loss of power, black smoke, whistle, often from ~100,000 km); EGR/DPF on later cars. Solid with maintenance.
What are the common problems and reviews for the Opel Astra H 1.7 CDTi (Z17DTH / A17DTJ, Isuzu)?
The most commonly reported problems: Turbocharger wear, EGR / DPF (later cars).
Is a used Opel Astra H 1.7 CDTi (Z17DTH / A17DTJ, Isuzu) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.