1.7 / 2.0 CDTI (diesel)
2009–2015 · diesel · 1956cc · 165hp
Engine codes: A17DTR, A17DTS, A20DTH, A20DTJ
Reliability, common problems and owner reviews for the Opel Astra J 1.7 / 2.0 CDTI (diesel). Check this before you buy used.
The CDTI diesels are the high-mileage Astra J choice — the 1.7 CDTI (Fiat-GM-derived) and the stronger 2.0 CDTI (the same chain-driven GM diesel as the Insignia, the better-matched engine). Watch the 2.0's timing-chain wear (rattle), the swirl-flap/intake and EGR sooting, DPF on short trips, and injector wear. With disciplined oil and motorway use the 2.0 covers big distances; buy on a documented service record. The 2.0 is the one to have for regular long runs.
Known Issues
2.0 CDTI chain/tensioner wear → rattle; labour-involved job.
Fix / Workaround: Strict oil; replace chain kit at rattle.
Repair cost: €500–€1300
Typically appears after: 150,000 km
DPF clogs on short trips; EGR/intake soot; injector wear.
Fix / Workaround: Motorway regens; clean EGR; injector test.
Repair cost: €250–€1100
Typically appears after: 140,000 km
Mileage Thresholds
After 160,000 km: Chain + DPF + injector window.
Pre-Purchase Checklist
- ☐2.0 CDTI: cold-start chain rattle check
- ☐DPF + EGR history (city cars)
- ☐2.0 better-matched than 1.7
Frequently asked questions
Is the Opel Astra J 1.7 / 2.0 CDTI (diesel) reliable?
Maint. Sensitive — The CDTI diesels are the high-mileage Astra J choice — the 1.7 CDTI (Fiat-GM-derived) and the stronger 2.0 CDTI (the same chain-driven GM diesel as the Insignia, the better-matched engine). Watch the 2.0's timing-chain wear (rattle), the swirl-flap/intake and EGR sooting, DPF on short trips, and injector wear. With disciplined oil and motorway use the 2.0 covers big distances; buy on a documented service record. The 2.0 is the one to have for regular long runs.
What are the common problems and reviews for the Opel Astra J 1.7 / 2.0 CDTI (diesel)?
The most commonly reported problems: Timing chain wear (2.0 CDTI), DPF / EGR / injectors.
Is a used Opel Astra J 1.7 / 2.0 CDTI (diesel) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.