1.4 TDI vs 1.9 TDI: which engine is more reliable?

According to our risk index, the 1.4 TDI carries less risk than the 1.9 TDI: 38/100 (moderate risk) versus 66/100 (high risk). The 1.4 TDI has 2 documented serious faults, the main one being «Timing belt and water pump»; the 1.9 TDI has 3 documented serious faults, the main one being «Big-end bearing failure».

Risk index

1.4 TDI

Moderate risk · 2 serious faults

Lower risk

Risk index

1.9 TDI

High risk · 3 serious faults

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

Reviewed on 27 September 202618 sources How we work

Is the 1.4 TDI reliable?

It depends on the generation. The unit-injector one (1999-2010) calls for watching the timing belt - which also drives the unit injector pumps - the water pump, the turbo and the EGR, with a DPF only on the last BlueMotion/Ecomotive versions. The later EA288 (2014-2019) is not singled out by dieselgate, which according to the sources consulted was limited to the EA189, but it shares the need to watch the belt, turbo, EGR and DPF.^[1][2][3]

See the 4 of the 1.4 TDI faults

Is the 1.9 TDI reliable?

It depends a lot on the version. The rotary pump (1996-2003, codes ALH and AGR among others) has a reputation for great durability. The unit injector system (1999-2010) improves performance and emissions, but has more documented faults: dual-mass flywheel, turbo, EGR valve and, above all in the 105 hp version, cases of broken big-end bearings.^{[3][4][5][6][7][8][9]}

See the 6 of the 1.9 TDI faults

Side-by-side comparison

Comparison of 1.4 TDI and 1.9 TDI
Item	1.4 TDI	1.9 TDI
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	1,422 cm³	1,896 cm³
Timing	Timing belt (dry)	Timing belt (dry)
Power	69–90 hp	75–150 hp
Production	1999–2019^[2][3]	1996–2010^{[3][10][11][12][13]}
Reliability
Risk index (what is it?)	38Moderate risk	66High risk
Documented faults	4	6
Of high or critical severity	2	3
Worst severity	High severity	Critical severity
Main faults	High severity: Timing belt and water pump High severity: Failing turbo: loss of power, whistling or smoke Medium severity: Clogged particulate filter (DPF)	Critical severity: Big-end bearing failure High severity: Seized or broken variable-geometry turbo Medium severity: EGR valve clogged with carbon
Most expensive documented repair	up to €2,000Clogged particulate filter (DPF)Published figure^[14]	up to €1,500Premature wear of the dual-mass flywheel and clutchPublished figure^[15]
Which versions to buy
BuyRecommended versions	1.4 TDI common rail EA288 (2014-2019)^[1][2]	1.9 TDI rotary pump (VP37, 1996-2003)^[4]
With cautionVersions to be cautious about	1.4 TDI unit injector, 3 cylinders (1999-2010)^[16][17][18]	1.9 TDI high-performance unit injector (101-150 hp, 1999-2003)^[6][15] 1.9 TDI unit injector 75-105 hp (2003-2010)^[5][9]
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

1.4 TDI

See the 10 models with the 1.4 TDI

1.9 TDI

See the 20 models with the 1.9 TDI

Other comparisons

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With the 1.9 TDI

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Sources

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

Escándalo de emisiones contaminantes de vehículos VolkswagenWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
VW EA288Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
List of discontinued Volkswagen Group diesel enginesWikipedia (inglés) · Other source · consulted 27 September 2026
Les TDI sont-ils fiables ?fiches-auto.fr · Motoring press · published 15 December 2016 · consulted 27 September 2026 · in French
Tous les problèmes sur Volkswagen Golf Vfiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Tous les problèmes sur Volkswagen Passat (1996-2004)fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Tous les problèmes sur Volkswagen Passat (2004-2010)fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Tous les problèmes sur Škoda Octavia (1997-2004)fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Tous les problèmes sur Škoda Octavia (2004-2012)fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Volkswagen Golf IVWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Volkswagen Golf VWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Volkswagen TouranWikipedia (inglés) · Other source · consulted 27 September 2026
Volkswagen CaddyWikipedia (inglés) · Other source · consulted 27 September 2026
Cuánto cuesta sustituir el filtro de partículas de un coche diéselDiariomotor · Motoring press · consulted 27 September 2026 · in Spanish
Tous les problèmes sur Volkswagen Golf IVfiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Bomba de agua del coche: la avería de más de 1.500 euros que arrastra la correa de distribuciónMotor16 · Motoring press · published 21 September 2026 · consulted 27 September 2026 · in Spanish
Cuánto cuesta válvula EGRDiariomotor · Motoring press · consulted 27 September 2026 · in Spanish
Cómo saber si el turbo está roto o a punto de romperseMotor.es · Motoring press · consulted 27 September 2026 · in Spanish