1.7 CRDi (D4FD)
2011–2019 · diesel · 1685cc · 136hp
Engine codes: D4FD
Reliability, common problems and owner reviews for the Hyundai i40 1.7 CRDi (D4FD). Check this before you buy used.
The 1.7 CRDi (D4FD) is the volume i40 engine and the high-mileage choice — economical, refined and the same well-proven U-line diesel used in the ix35/Sportage/Tucson. Standard modern-diesel cautions: DPF clogging on short trips, EGR sooting and injector wear, plus occasional turbo attention at high mileage. With disciplined oil and motorway use it's a dependable long-hauler; buy on DPF and oil history.
Same engine, other cars
This is the same physical engine (D4FD) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
DPF clogs and EGR soots on urban use.
Fix / Workaround: Motorway regens; clean/replace EGR + DPF.
Repair cost: €300–€1100
Typically appears after: 130,000 km
Injector wear; turbo attention at high mileage.
Fix / Workaround: Injector test; check turbo.
Repair cost: €200–€1200
Typically appears after: 170,000 km
Mileage Thresholds
After 180,000 km: DPF + injector window.
Pre-Purchase Checklist
- ☐Oil + DPF history
- ☐The high-mileage choice
- ☐Shared U-line diesel (ix35/Sportage)
Frequently asked questions
Is the Hyundai i40 1.7 CRDi (D4FD) reliable?
Maint. Sensitive — The 1.7 CRDi (D4FD) is the volume i40 engine and the high-mileage choice — economical, refined and the same well-proven U-line diesel used in the ix35/Sportage/Tucson. Standard modern-diesel cautions: DPF clogging on short trips, EGR sooting and injector wear, plus occasional turbo attention at high mileage. With disciplined oil and motorway use it's a dependable long-hauler; buy on DPF and oil history.
What are the common problems and reviews for the Hyundai i40 1.7 CRDi (D4FD)?
The most commonly reported problems: DPF / EGR (short trips), Injector / turbo (high miles).
Is a used Hyundai i40 1.7 CRDi (D4FD) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.