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1.6 HDi vs 2.3 dCi (M9T): which engine is more reliable?

According to our risk index, the 2.3 dCi (M9T) carries less risk than the 1.6 HDi: 32/100 (moderate risk) versus 71/100 (high risk). The 1.6 HDi has 2 documented serious faults, the main one being «Turbo failure through lack of lubrication (carbon deposits and union filter)»; the 2.3 dCi (M9T) has 2 documented serious faults, the main one being «Clogged or broken EGR valve damaging the turbo».

Risk index

1.6 HDi

71

High risk · 2 serious faults

Risk index

2.3 dCi (M9T)

32

Moderate risk · 2 serious faults

Lower risk

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

28 sourcesHow we work

Is the 1.6 HDi reliable?

It is an efficient diesel, but its 16-valve versions (2004-2011) have a serious weak point: the turbo is starved of lubrication by carbon deposits from the oil, often made worse by leaks at the injector washers. The 8V engines (from 2010) improved, although you need to watch the 2010-2011 belt and the injectors, and on the BlueHDi the AdBlue tank.[1][2][3][4][5][6][7][8][9]

See the 7 of the 1.6 HDi faults

Is the 2.3 dCi (M9T) reliable?

The 2.3 dCi M9T is a van diesel with good durability if maintenance is kept up. The weak points cited are the EGR and the turbo, the injectors, and the particulate filter in urban use; the sources are mostly opinion websites.[10][11]

See the 5 of the 2.3 dCi (M9T) faults

Side-by-side comparison

Comparison of 1.6 HDi and 2.3 dCi (M9T)
1.6 HDi2.3 dCi (M9T)
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement1,560 cm³2,300 cm³
TimingTiming belt (dry)Chain
Power75–120 hp100–180 hp
Production2004–2019[4][6][12][13][14][15][16]since 2010[10][11][17]
Reliability
Risk index (what is it?)71High risk32Moderate risk
Documented faults75
Of high or critical severity22
Worst severityHigh severityHigh severity
Main faults
  1. High severity: Turbo failure through lack of lubrication (carbon deposits and union filter)
  2. High severity: Timing belt failure and premature wear
  3. Medium severity: AdBlue tank and pump fault (1.6 BlueHDi)
  1. High severity: Clogged or broken EGR valve damaging the turbo
  2. Medium severity: Faulty injectors on the 2.3 dCi
  3. Medium severity: Diesel particulate filter (DPF) clogged in urban use
Most expensive documented repairup to €1,500Turbo failure through lack of lubrication (carbon deposits and union filter)Estimate[1][18][19][20][21][22][23]up to €2,300Clogged or broken EGR valve damaging the turboPublished figure[10][24]
Which versions to buy
BuyRecommended versions
  • 1.6 HDi / e-HDi 92/95 8V (DV6D, 2009-2016)[25][26]
  • 2.3 dCi 100-125 hp (M9T)[11]
  • 2.3 dCi 130-145 hp (M9T)[11]
With cautionVersions to be cautious about
  • 1.6 HDi 75/90 16V (DV6BTED4 / DV6ATED4, 2004-2011)[2][3][25]
  • 1.6 HDi 110 16V DPF (DV6TED4, 2004-2011)[2][6][25]
  • 1.6 HDi / e-HDi 112/115 8V (DV6C, 2010-2015)[5][7]
  • 1.6 BlueHDi 75/100/120 (DV6FE / DV6FD / DV6FC, 2013-2019)[8][15][27]
  • 2.3 dCi 150-180 hp (M9T, some twin-turbo)[11]
  • 2.3 dCi in the Navara D23 (NP300)[28]
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 HDi

See the 48 models with the 1.6 HDi

2.3 dCi (M9T)

Other comparisons

With the 1.6 HDi

With the 2.3 dCi (M9T)

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. Häufige Schäden und die professionelle Reparatur (Turbolader PSA 1,6 HDi)Krafthand · Motoring press · published 6 June 2013 · consulted 26 September 2026 · in German
  2. Boletín de servicio: sustitución del turbo en motores DV6 (versión reducida de la Información de servicio nº 77)Turbotec · Technical documentation · consulted 26 September 2026 · in Spanish
  3. Diesel : la liste des pannes récurrentes des moteurs HDi, dCi, TDI... (1.6 HDi)L'argus · Motoring press · published 28 October 2014 · consulted 26 September 2026 · in French
  4. Fiabilité Citroën Peugeot. Le bloc 1.6 HDi 8 soupapes est-il fiable ?L'argus · Motoring press · published 23 March 2015 · consulted 26 September 2026 · in French
  5. Fiabilité Citroën Peugeot. Le bloc 1.6 HDi 8 soupapes est-il fiable ? (1.6 HDi 112/115)L'argus · Motoring press · published 23 March 2015 · consulted 26 September 2026 · in French
  6. Essai, avis et fiabilité des 1.6 HDI 110 chFiches-Auto.fr · Motoring press · consulted 26 September 2026 · in French
  7. Essai, avis et fiabilité des 1.6 HDI 112 chFiches-Auto.fr · Motoring press · consulted 26 September 2026 · in French
  8. OCU y BEUC consiguen que Stellantis amplíe la garantía de los coches con AdBlueOCU · Consumer association · published 27 December 2024 · consulted 26 September 2026 · in Spanish
  9. El Grupo PSA lanza la gama de motores Blue HDikm77 · Motoring press · published 16 September 2013 · consulted 26 September 2026 · in Spanish
  10. Renault Master III 2.3 dCi 130: fiabilité, pannes et coûtsCarverif · Other source · consulted 5 October 2026 · in French
  11. Fiabilité Renault Master 2.3 dCiCarverif · Other source · consulted 5 October 2026 · in French
  12. Prueba de consumo (202): Peugeot Partner Outdoor 1.6-BlueHDi 120 CVkm77 · Motoring press · published 24 December 2015 · consulted 26 September 2026 · in Spanish
  13. Motor PSA DVWikipedia (es) · Other source · consulted 26 September 2026 · in Spanish
  14. Peugeot DV6TED4 engine: specifications and applicationsMyMotorList · Technical documentation · consulted 26 September 2026
  15. Fiabilité 1.6 BlueHDIFiches-Auto.fr · Motoring press · published 9 December 2021 · consulted 26 September 2026 · in French
  16. Motor Peugeot DV6FDTED: especificaciones y aplicacionesMyMotorList · Technical documentation · consulted 26 September 2026 · in Spanish
  17. Renault Master (tercera generación)Wikipedia · Other source · consulted 5 October 2026
  18. Turbo intercambio Garrett 753420 motor 1.6HDi 1.6TDCI 1.6DFG Automoción · Technical documentation · consulted 26 September 2026 · in Spanish
  19. Turbo Garrett 753420 (GT1544V) para 1.6 HDI 110 CVAML Turbos · Technical documentation · consulted 26 September 2026 · in Spanish
  20. Tubo de engrase PSA 1.6 HDI 110 CV + filtro (OP10049COMP)Electromotor Lantejuela · Technical documentation · consulted 26 September 2026 · in Spanish
  21. ¿Cuál es el precio de la mano de obra en los talleres de las 10 marcas más vendidas en España?km77 · Motoring press · published 30 December 2024 · consulted 26 September 2026 · in Spanish
  22. La doble tarifa de la mano de obra en los talleres españoles: lo que dice su tablón vs. lo que realmente ingresanInfotaller · Motoring press · published June 2026 · consulted 26 September 2026 · in Spanish
  23. ¿Estás cobrando lo justo en tu taller? Así está la mano de obra por hora en 2025Infotaller · Motoring press · published 9 September 2025 · consulted 26 September 2026 · in Spanish
  24. Fiabilité du Renault Master RT 2.3 dCi: analyse complèteCarverif · Other source · consulted 5 October 2026 · in French
  25. Fiabilité 1.6 HDIFiches-Auto.fr · Motoring press · published 22 April 2024 · consulted 26 September 2026 · in French
  26. Essai, avis et fiabilité des 1.6 HDI 92 chFiches-Auto.fr · Motoring press · consulted 26 September 2026 · in French
  27. Adblue : problèmes en pagaille ?Fiches-Auto.fr · Motoring press · consulted 26 September 2026 · in French
  28. Nissan Navara wymaga zmian systemu oczyszczania spalinAutokatalog.pl · Motoring press · published 23 August 2023 · consulted 5 October 2026 · in another language