2.5 dCi YD25 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 2.5 dCi YD25: 32/100 (moderate risk) versus 59/100 (high risk). The 2.5 dCi YD25 has 3 documented serious faults, the main one being «Timing chain wear and failure»; the 2.3 dCi (M9T) has 2 documented serious faults, the main one being «Clogged or broken EGR valve damaging the turbo».

Risk index

2.5 dCi YD25

High risk · 3 serious faults

Risk index

2.3 dCi (M9T)

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

Reviewed on 5 October 202610 sources How we work

Is the 2.5 dCi YD25 reliable?

The 2.5 dCi YD25 in the Navara D40 and Pathfinder R51 is tough, but it has one documented weak point: the lower timing chain, whose failure can destroy the engine. Check its condition, as well as the EGR and the turbo.^[1][2][3]

See the 4 of the 2.5 dCi YD25 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.^[4][5]

See the 5 of the 2.3 dCi (M9T) faults

Side-by-side comparison

Comparison of 2.5 dCi YD25 and 2.3 dCi (M9T)
Item	2.5 dCi YD25	2.3 dCi (M9T)
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,488 cm³	2,300 cm³
Timing	Chain	Chain
Power	144–190 hp	100–180 hp
Production	2005–2015^[1][6][7]	since 2010^[4][5][8]
Reliability
Risk index (what is it?)	59High risk	32Moderate risk
Documented faults	4	5
Of high or critical severity	3	2
Worst severity	Critical severity	High severity
Main faults	Critical severity: Timing chain wear and failure High severity: Turbocharger failure Medium severity: EGR valve clogged with carbon	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
Most expensive documented repair	No reliable data	up to €2,300Clogged or broken EGR valve damaging the turboPublished figure^[4][9]
Which versions to buy
BuyRecommended versions	None	2.3 dCi 100-125 hp (M9T)^[5] 2.3 dCi 130-145 hp (M9T)^[5]
With cautionVersions to be cautious about	2.5 dCi 144 and 174 hp (YD25DDTi, 2005-2010)^[1][2] 2.5 dCi 190 hp (YD25DDTi, 2010-2015)^[1][2]	2.3 dCi 150-180 hp (M9T, some twin-turbo)^[5] 2.3 dCi in the Navara D23 (NP300)^[10]
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

2.5 dCi YD25

2.3 dCi (M9T)

Other comparisons

With the 2.5 dCi YD25

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.

Tips for buying a second-hand pickup: Nissan NavaraFarmers Weekly Interactive · Motoring press · consulted 5 October 2026
YD25 Engine Guide: Specs, Reliability, Problems & Buying TipsAutopartswd · Technical documentation · consulted 5 October 2026
Nissan Navara ProblemeCarwiki.de · Other source · consulted 5 October 2026 · in German
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
Nissan YD engineWikipedia · Other source · consulted 5 October 2026
Nissan NavaraWikipedia · Other source · consulted 5 October 2026
Renault Master (tercera generación)Wikipedia · Other source · consulted 5 October 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