2.4 JTD / JTDm Multijet vs D4/D5: which engine is more reliable?

According to our risk index, the 2.4 JTD / JTDm Multijet carries less risk than the D4/D5: 25/100 (moderate risk) versus 64/100 (high risk). The 2.4 JTD / JTDm Multijet has no documented serious faults; the D4/D5 has 2 documented serious faults, the main one being «Auxiliary belt breakage that takes the timing belt with it (5-cylinder)».

Risk index

2.4 JTD / JTDm Multijet

Moderate risk · 0 serious faults

Lower risk

Risk index

D4/D5

High risk · 2 serious faults

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

Reviewed on 8 October 202617 sources How 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 D4/D5 reliable?

The Volvo D5/D4 covers two different engines: the classic 5-cylinder (2001-2016, D5244T/D5204) and the 4-cylinder VEA (D4204T, from 2013). On the former, several owners document the auxiliary belt breaking and taking the timing belt with it, destroying the engine; on the VEA the most common problems are the EGR, the DPF and oil consumption that can damage the turbo from 90,000-150,000 km. Neither is an engine to buy without checking its service history.^[3][4][5][6]

See the 6 of the D4/D5 faults

Side-by-side comparison

Comparison of 2.4 JTD / JTDm Multijet and D4/D5
Item	2.4 JTD / JTDm Multijet	D4/D5
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,387 cm³	—
Timing	Timing belt (dry)	Timing belt (dry)
Power	136–210 hp	120–235 hp
Production	1998–2011^{[1][7][8][9][10]}	2001–2024^[3][4][11]
Reliability
Risk index (what is it?)	25Moderate risk	64High risk
Documented faults	4	6
Of high or critical severity	0	2
Worst severity	Medium severity	Critical severity
Main faults	Medium severity: Intake manifold flap failure (swirl flaps) Medium severity: Clogged or faulty EGR valve on the 2.4 JTD and JTDm Medium severity: Injector failure and diesel leaks on the 2.4 JTDm	Critical severity: Auxiliary belt breakage that takes the timing belt with it (5-cylinder) High severity: High oil consumption from 90,000-150,000 km that harms the turbo (VEA) Medium severity: Clogged EGR valve or EGR cooler leaking into the intake
Most expensive documented repair	up to €800Clogged or faulty EGR valve on the 2.4 JTD and JTDmPublished figure^[12]	No reliable data
Which versions to buy
BuyRecommended versions	2.4 JTD 10V (136-150 hp, 1998-2007)^[1][8][13]	None
With cautionVersions to be cautious about	2.4 JTDm / Multijet 20V (175-185 hp, 2003-2009)^[1][13] 2.4 JTDm / Multijet 20V 200 hp (2005-2011)^[1][2] 2.4 JTDm 20V 210 hp (Alfa Romeo, 2007-2010)^{[1][2][14][15]}	2.4/2.0 D3/D4/D5 5-cylinder (D5244T/D5204, 2001-2016)^[5][16] 2.0 D2/D3/D4/D5 VEA 4-cylinder (D4204T, 2013-2024)^[5][6][17]
AvoidVersions to avoid	None	None

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

D4/D5

See the 14 models with the D4/D5

Other comparisons

With the 2.4 JTD / JTDm Multijet

With the D4/D5

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Sources

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

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
Fiabilité Alfa-romeo 159 (2005-2012) (428 témoignages)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
Volvo Engine ArchitectureWikipedia · Other source · consulted 27 September 2026
Volvo D5: 185 CV para el S60, V70, XC70 y XC90Autopista.es · Motoring press · published July 2005 · consulted 27 September 2026 · in Spanish
Fiabilité et pannes Volvo XC60 (2008-2017)Fiches-auto.fr · Other source · consulted 27 September 2026 · in French
Fiabilité et pannes Volvo V60Fiches-auto.fr · Other source · consulted 27 September 2026 · in French
Fiat JTD engineWikipedia · Other source · consulted 8 October 2026
Alfa Romeo Brera (guía del taller)The Alfa Workshop · Other source · consulted 8 October 2026
Alfa Romeo 159Wikipedia (alemán) · Other source · consulted 8 October 2026 · in German
SCHAEFFLER - ALFA ROMEO 159 (939_) 2.4 JTDM (939AXD)Rolling Kft. (catálogo) · Technical documentation · consulted 8 October 2026
Volvo XC90Wikipedia · Other source · consulted 27 September 2026 · in Spanish
¿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
Fiabilité Alfa-romeo 156: pannes par motorisation (2.4 JTD)Fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
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
Guía de compra del Alfa Romeo 159 de segunda manoDiariomotor · Motoring press · published 9 February 2024 · consulted 8 October 2026 · in Spanish
Fiabilité et pannes Volvo S60Fiches-auto.fr · Other source · consulted 27 September 2026 · in French
Fiabilité et pannes Volvo XC60 (2017-)Fiches-auto.fr · Other source · consulted 27 September 2026 · in French