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1.6 CRDi vs 1.9 dCi: which engine is more reliable?

According to our risk index, the 1.9 dCi carries less risk than the 1.6 CRDi: 67/100 versus 70/100 (both high risk). The 1.6 CRDi has 4 documented serious faults, the main one being «MHSG belt tensioner and crankshaft pulley failure (48V mild hybrid)»; the 1.9 dCi has 3 documented serious faults, the main one being «Seizure and wear of the big-end bearings».

Risk index

1.6 CRDi

70

High risk · 4 serious faults

Risk index

1.9 dCi

67

High risk · 3 serious faults

Lower risk

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

19 sourcesHow we work

Is the 1.6 CRDi reliable?

The U2 D4FB (2009-2018) is a generally robust diesel if well maintained, with known turbo failures in the early units and timing chain problems from 120,000-150,000 km. Its successor, the Smartstream (U3 D4FE, from 2018), has a good reputation, except in the 48V mild hybrid version, which has a belt tensioner and crankshaft pulley fault that can destroy the engine.[1][2][3]

See the 6 of the 1.6 CRDi faults

Is the 1.9 dCi reliable?

The 1.9 dCi (F9Q) was Renault's first common-rail diesel (1999) and powered a large part of its range, and those of Nissan and Volvo, for more than a decade. It has well-documented weak points: on versions of up to 120 hp built before 2005, the big-end bearings can seize and the turbo tends to degrade around 150,000 km; the injectors, the EGR valve and, on the 120 hp versions, the dual-mass flywheel also fail fairly often.[4][5][6][7][8]

See the 5 of the 1.9 dCi faults

Side-by-side comparison

Comparison of 1.6 CRDi and 1.9 dCi
1.6 CRDi1.9 dCi
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement1,582 cm³1,870 cm³
TimingChainTiming belt (dry)
Power90–136 hp80–130 hp
Productionsince 2009[1][9][10][11]1999–2011[12][13][14]
Reliability
Risk index (what is it?)70High risk67High risk
Documented faults65
Of high or critical severity43
Worst severityCritical severityCritical severity
Main faults
  1. Critical severity: MHSG belt tensioner and crankshaft pulley failure (48V mild hybrid)
  2. Critical severity: Timing chain stretch
  3. High severity: Premature variable-geometry turbo (VGT) failure
  1. Critical severity: Seizure and wear of the big-end bearings
  2. High severity: Premature turbocharger wear
  3. High severity: Failures of the Delphi direct-injection injectors
Most expensive documented repairup to €1,800Particulate filter (DPF) blocked in urban usePublished figure[15]No reliable data
Which versions to buy
BuyRecommended versions
  • Smartstream 1.6 CRDi U3 (D4FE, 115-136 hp, without mild hybrid, from 2018)[2][16]
None
With cautionVersions to be cautious about
  • 1.6 CRDi U2 (D4FB, 90-136 hp, sold in Spain from 2010 to ~2018)[1][17][18]
  • Smartstream 1.6 CRDi 48V mild hybrid (D4FE MHEV, 136 hp, from ~2019)[3][19]
  • 1.9 dCi 95-120 (F9Q, first generation, 1999-2005)[6]
  • 1.9 dCi 125-130 (F9Q, Energy dCi, 2005-2011)[6]
  • 1.9 dCi 80-101 (F9Q, vans and commercial vehicles, 1999-2007)[4][5]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

1.6 CRDi

See the 16 models with the 1.6 CRDi

1.9 dCi

See the 13 models with the 1.9 dCi

Other comparisons

With the 1.6 CRDi

With the 1.9 dCi

Compare other engines

That is the comparison you are viewing: change one of the two engines.

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Motor Kia y Hyundai 1.6 CRDI (D4FB): ficha tecnica, problemas y tuningMotordinámico · Technical documentation · consulted 26 September 2026 · in Spanish
  2. Kia Ceed III: Bekannte Probleme & RückrufeGebrauchtwagenberater · Other source · consulted 26 September 2026 · in German
  3. Kia / Hyundai 1.6 CRDi MHEV Engine FailuresDOHC (especialista en reconstrucción de motores) · Technical documentation · consulted 26 September 2026
  4. Renault Mégane II (2002 – 2009): Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
  5. Renault Scénic II (2003 – 2009) – Typische Probleme & KrankheitenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
  6. Achat d'occasion : faut-il éviter le moteur 1.9 dCi F9Q chez Renault ?Planète Renault · Motoring press · published 24 January 2024 · consulted 27 September 2026 · in French
  7. Diesels : volant moteur défectueuxFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  8. Vanne EGR : problèmes et pannesFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  9. Hyundai U engineWikipedia · Other source · consulted 26 September 2026
  10. Hyundai Smartstream engineWikipedia · Other source · consulted 26 September 2026
  11. Hyundai i30 Kombi 1.6 CRDi 48V-Mildhybrid Trend (10/20-01/22): Technische Daten, Bilder, PreiseADAC · Technical documentation · consulted 26 September 2026 · in German
  12. Renault F-Type engineWikipedia · Other source · consulted 27 September 2026
  13. Moteur F RenaultWikipédia · Other source · consulted 27 September 2026 · in French
  14. Renault Espace IVWikipedia · Other source · consulted 27 September 2026 · in German
  15. Kia Ceed 1.6 Crdi Problemas | Fallos y averías más frecuentesTotalRenting · Other source · consulted 26 September 2026 · in Spanish
  16. Kia Ceed im TÜV-Check 2026: Schwachstellen, Mängel und ProblemeAUTO BILD · Motoring press · published 2026 · consulted 26 September 2026 · in German
  17. Kia and Hyundai 1.6 CRDI (D4FB) engineEngineDNA · Other source · consulted 26 September 2026
  18. Best Hyundai Kia 1.6 CRDI Mods & Upgrades Guide to D4FB TuningTorqueCars · Other source · consulted 26 September 2026
  19. KIA SPORTAGE 2023 - vehicle recallsGOV.UK (Driver and Vehicle Standards Agency) · Official body · consulted 26 September 2026