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2.4 JTD / JTDm Multijet vs 2.3 dCi (M9T): which engine is more reliable?

According to our risk index, the 2.4 JTD / JTDm Multijet carries less risk than the 2.3 dCi (M9T): 25/100 versus 32/100 (both moderate risk). The 2.4 JTD / JTDm Multijet has no documented serious faults; the 2.3 dCi (M9T) has 2 documented serious faults, the main one being «Clogged or broken EGR valve damaging the turbo».

Risk index

2.4 JTD / JTDm Multijet

25

Moderate risk · 0 serious faults

Lower risk

Risk index

2.3 dCi (M9T)

32

Moderate risk · 2 serious faults

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

15 sourcesHow we work

Is the 2.4 JTD / JTDm Multijet reliable?

The five-cylinder 2.4 JTD/JTDm is powerful but more delicate in its 20V version. Auto Świat says the 10V rarely breaks down on its own; on the 20V, owner testimonies for the 200 and 210 hp Alfa 159 pile up mentions of the EGR and particulate filter, and the 200 hp had the manifold flap failure that Fiat corrected in 2007.[1][2]

See the 4 of the 2.4 JTD / JTDm Multijet 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.[3][4]

See the 5 of the 2.3 dCi (M9T) faults

Side-by-side comparison

Comparison of 2.4 JTD / JTDm Multijet and 2.3 dCi (M9T)
2.4 JTD / JTDm Multijet2.3 dCi (M9T)
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement2,387 cm³2,300 cm³
TimingTiming belt (dry)Chain
Power136–210 hp100–180 hp
Production1998–2011[1][5][6][7][8]since 2010[3][4][9]
Reliability
Risk index (what is it?)25Moderate risk32Moderate risk
Documented faults45
Of high or critical severity02
Worst severityMedium severityHigh severity
Main faults
  1. Medium severity: Intake manifold flap failure (swirl flaps)
  2. Medium severity: Clogged or faulty EGR valve on the 2.4 JTD and JTDm
  3. Medium severity: Injector failure and diesel leaks on the 2.4 JTDm
  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 €800Clogged or faulty EGR valve on the 2.4 JTD and JTDmPublished figure[10]up to €2,300Clogged or broken EGR valve damaging the turboPublished figure[3][11]
Which versions to buy
BuyRecommended versions
  • 2.3 dCi 100-125 hp (M9T)[4]
  • 2.3 dCi 130-145 hp (M9T)[4]
With cautionVersions to be cautious about
  • 2.4 JTDm / Multijet 20V (175-185 hp, 2003-2009)[1][12]
  • 2.4 JTDm / Multijet 20V 200 hp (2005-2011)[1][2]
  • 2.4 JTDm 20V 210 hp (Alfa Romeo, 2007-2010)[1][2][13][14]
  • 2.3 dCi 150-180 hp (M9T, some twin-turbo)[4]
  • 2.3 dCi in the Navara D23 (NP300)[15]
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

2.4 JTD / JTDm Multijet

See the 7 models with the 2.4 JTD / JTDm Multijet

2.3 dCi (M9T)

Other comparisons

With the 2.4 JTD / JTDm Multijet

With the 2.3 dCi (M9T)

Compare other engines

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Sources

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

  1. Silnik 2.4 JTD: mocny i trwały, ale czasem też kapryśnyAuto Świat · Motoring press · published 26 September 2011 · consulted 8 October 2026 · in another language
  2. Fiabilité Alfa-romeo 159 (2005-2012) (428 témoignages)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
  3. Renault Master III 2.3 dCi 130: fiabilité, pannes et coûtsCarverif · Other source · consulted 5 October 2026 · in French
  4. Fiabilité Renault Master 2.3 dCiCarverif · Other source · consulted 5 October 2026 · in French
  5. Fiat JTD engineWikipedia · Other source · consulted 8 October 2026
  6. Alfa Romeo Brera (guía del taller)The Alfa Workshop · Other source · consulted 8 October 2026
  7. Alfa Romeo 159Wikipedia (alemán) · Other source · consulted 8 October 2026 · in German
  8. SCHAEFFLER - ALFA ROMEO 159 (939_) 2.4 JTDM (939AXD)Rolling Kft. (catálogo) · Technical documentation · consulted 8 October 2026
  9. Renault Master (tercera generación)Wikipedia · Other source · consulted 5 October 2026
  10. ¿Qué precio tiene cambiar una válvula EGR?RACE (Real Automóvil Club de España) · Other source · published 17 June 2024 · consulted 8 October 2026 · in Spanish
  11. Fiabilité du Renault Master RT 2.3 dCi: analyse complèteCarverif · Other source · consulted 5 October 2026 · in French
  12. Fiabilité Alfa-romeo 156: pannes par motorisation (2.4 JTD)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
  13. Alfa Romeo 159 2.4 JTD 210 ch 93 000 km (2008, Ti): avis d'un propriétaireFiches-auto.fr · Owners' forum · published 26 January 2013 · consulted 8 October 2026 · in French
  14. Guía de compra del Alfa Romeo 159 de segunda manoDiariomotor · Motoring press · published 9 February 2024 · consulted 8 October 2026 · in Spanish
  15. Nissan Navara wymaga zmian systemu oczyszczania spalinAutokatalog.pl · Motoring press · published 23 August 2023 · consulted 5 October 2026 · in another language