2.3 dCi (M9T) vs 1.4 D-4D: which engine is more reliable?

According to our risk index, the 2.3 dCi (M9T) carries less risk than the 1.4 D-4D: 32/100 versus 48/100 (both moderate risk). The 2.3 dCi (M9T) has 2 documented serious faults, the main one being «Clogged or broken EGR valve damaging the turbo»; the 1.4 D-4D has 2 documented serious faults, the main one being «Turbocharger failure».

Risk index

2.3 dCi (M9T)

Moderate risk · 2 serious faults

Lower risk

Risk index

1.4 D-4D

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

Reviewed on 5 October 202612 sources How we work

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.^[1][2]

See the 5 of the 2.3 dCi (M9T) faults

Is the 1.4 D-4D reliable?

Yes, generally: the 1.4 D-4D (1ND-TV) is one of Toyota's most widespread small diesels, with a reputation for reasonable reliability. The documented weak points are the injectors, the turbo, the EGR valve, the diesel particulate filter (on versions that have one) and the clutch and dual-mass flywheel assembly, with cases spread between 2002 and 2018 across the Yaris, Corolla, Auris, Urban Cruiser, Verso-S and MINI One D.^{[3][4][5][6][7]}

See the 6 of the 1.4 D-4D faults

Side-by-side comparison

Comparison of 2.3 dCi (M9T) and 1.4 D-4D
Item	2.3 dCi (M9T)	1.4 D-4D
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,300 cm³	1,364 cm³
Timing	Chain	Chain
Power	100–180 hp	75–90 hp
Production	since 2010^[1][2][8]	2002–2018^[3][9]
Reliability
Risk index (what is it?)	32Moderate risk	48Moderate risk
Documented faults	5	6
Of high or critical severity	2	2
Worst severity	High severity	High severity
Main faults	High severity: Clogged or broken EGR valve damaging the turbo Medium severity: Faulty injectors on the 2.3 dCi Medium severity: Diesel particulate filter (DPF) clogged in urban use	High severity: Turbocharger failure High severity: Oil build-up in the intercooler of the 1.4 D-4D (2014 campaign) Medium severity: Injector wear and failure
Most expensive documented repair	up to €2,300Clogged or broken EGR valve damaging the turboPublished figure^[1][10]	No reliable data
Which versions to buy
BuyRecommended versions	2.3 dCi 100-125 hp (M9T)^[2] 2.3 dCi 130-145 hp (M9T)^[2]	None
With cautionVersions to be cautious about	2.3 dCi 150-180 hp (M9T, some twin-turbo)^[2] 2.3 dCi in the Navara D23 (NP300)^[11]	1.4 D-4D 75 (1ND-TV, 75 hp, 2002-2005)^[5][7] 1.4 D-4D 90 (1ND-TV, 88-90 hp, 2004-2018)^[4][6][12]
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

2.3 dCi (M9T)

1.4 D-4D

See the 8 models with the 1.4 D-4D

Other comparisons

With the 2.3 dCi (M9T)

With the 1.4 D-4D

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.

Renault Master III 2.3 dCi 130: fiabilité, pannes et coûtsCarverif · Other source · consulted 5 October 2026 · in French
Fiabilité Renault Master 2.3 dCiCarverif · Other source · consulted 5 October 2026 · in French
Toyota ND engineWikipedia · Other source · consulted 27 September 2026
Toyota Yaris 2 (2005-2011) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Toyota Yaris (1999-2005) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Toyota Auris (2007-2012) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Mini Mini (2001-2006) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Renault Master (tercera generación)Wikipedia · Other source · consulted 5 October 2026
Toyota Corolla (E120)Wikipedia · Other source · consulted 27 September 2026
Fiabilité du Renault Master RT 2.3 dCi: analyse complèteCarverif · Other source · consulted 5 October 2026 · in French
Nissan Navara wymaga zmian systemu oczyszczania spalinAutokatalog.pl · Motoring press · published 23 August 2023 · consulted 5 October 2026 · in another language
Toyota Corolla (2002-2007) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French