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MotorFiable

1.6 CRDi vs 1.9 D / dTi: which engine is more reliable?

According to our risk index, the 1.9 D / dTi carries less risk than the 1.6 CRDi: 52/100 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 D / dTi has 3 documented serious faults, the main one being «Damaged cylinder head and head gasket (naturally aspirated 1.9 D)».

Risk index

1.6 CRDi

70

High risk · 4 serious faults

Risk index

1.9 D / dTi

52

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

20 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 D / dTi reliable?

Renault's 1.9 D, 1.9 TD and 1.9 dTi diesels (F8Q, F8Qt and F9Q with an injection pump) have a reputation for longevity, but owner reviews repeat three weak points: the injection pump and cylinder head gasket on the naturally aspirated 1.9 D, and the auxiliary belt, EGR and turbo on the dTi. The common-rail 1.9 dCi is a different engine.[4][5][6][7]

See the 7 of the 1.9 D / dTi faults

Side-by-side comparison

Comparison of 1.6 CRDi and 1.9 D / dTi
1.6 CRDi1.9 D / dTi
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement1,582 cm³1,870 cm³
TimingChainTiming belt (dry)
Power90–136 hp55–100 hp
Productionsince 2009[1][8][9][10]1988–2006[4][11][12]
Reliability
Risk index (what is it?)70High risk52High risk
Documented faults67
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. High severity: Damaged cylinder head and head gasket (naturally aspirated 1.9 D)
  2. Critical severity: Brake servo vacuum pump: oil suction and loss of assistance
  3. High severity: Auxiliary and timing belt: breakage that can destroy the engine
Most expensive documented repairup to €1,800Particulate filter (DPF) blocked in urban usePublished figure[13]No reliable data
Which versions to buy
BuyRecommended versions
  • Smartstream 1.6 CRDi U3 (D4FE, 115-136 hp, without mild hybrid, from 2018)[2][14]
None
With cautionVersions to be cautious about
  • 1.6 CRDi U2 (D4FB, 90-136 hp, sold in Spain from 2010 to ~2018)[1][15][16]
  • Smartstream 1.6 CRDi 48V mild hybrid (D4FE MHEV, 136 hp, from ~2019)[3][17]
  • 1.9 D 55/65 hp (F8Q, naturally aspirated indirect injection, 1988-2006)[5][6][7][18]
  • 1.9 TD/dT 90-95 hp (F8Qt, turbo with indirect injection, 1991-2001)[4][7]
  • 1.9 dTi 80-100 hp (F9Q with mechanical pump, direct injection and turbo, 1997-2002)[7][18][19][20]
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 18 models with the 1.6 CRDi

1.9 D / dTi

See the 7 models with the 1.9 D / dTi

Other comparisons

With the 1.6 CRDi

With the 1.9 D / dTi

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. Moteur F (Renault)Wikipédia (francés) · Other source · consulted 2 November 2026 · in French
  5. Renault Clio IIWikipédia (francés) · Other source · consulted 2 November 2026 · in French
  6. Fiabilité Renault Clio 2 : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  7. Fiabilité Renault Mégane 1 (1995-2002) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  8. Hyundai U engineWikipedia · Other source · consulted 26 September 2026
  9. Hyundai Smartstream engineWikipedia · Other source · consulted 26 September 2026
  10. 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
  11. Renault F-Type engineWikipedia (inglés) · Other source · consulted 2 November 2026
  12. Renault Clio IIWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  13. Kia Ceed 1.6 Crdi Problemas | Fallos y averías más frecuentesTotalRenting · Other source · consulted 26 September 2026 · in Spanish
  14. Kia Ceed im TÜV-Check 2026: Schwachstellen, Mängel und ProblemeAUTO BILD · Motoring press · published 2026 · consulted 26 September 2026 · in German
  15. Kia and Hyundai 1.6 CRDI (D4FB) engineEngineDNA · Other source · consulted 26 September 2026
  16. Best Hyundai Kia 1.6 CRDI Mods & Upgrades Guide to D4FB TuningTorqueCars · Other source · consulted 26 September 2026
  17. KIA SPORTAGE 2023 - vehicle recallsGOV.UK (Driver and Vehicle Standards Agency) · Official body · consulted 26 September 2026
  18. Fiabilité Renault Kangoo (1997-2007) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  19. Fiabilité Renault Scénic 1 (1996-2003) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
  20. Fiabilité Renault Laguna 1 (1994-2001) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French