1.4 T-Jet vs 1.6 THP: which engine is more reliable?

According to our risk index, the 1.4 T-Jet carries less risk than the 1.6 THP: 48/100 (moderate risk) versus 64/100 (high risk). The 1.4 T-Jet has 1 documented serious fault, the main one being «Premature turbocharger failure or wear»; the 1.6 THP has 2 documented serious faults, the main one being «Timing chain and tensioner stretch (turbo versions, before 2012)».

Risk index

1.4 T-Jet

Moderate risk · 1 serious fault

Lower risk

Risk index

1.6 THP

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 27 September 202621 sources How we work

Is the 1.4 T-Jet reliable?

Fiat's 1.4 T-Jet/MultiAir powers a large part of the group's turbo petrol range (Fiat, Abarth, Alfa Romeo, Lancia, Jeep) from 2007 onwards. Several models have accumulated reports of turbocharger failure, MultiAir/UniAir unit faults and high oil consumption; by contrast, there is no documented pattern of timing belt failure.^{[1][2][3][4][5][6]}

See the 4 of the 1.4 T-Jet faults

Is the 1.6 THP reliable?

The 1.6 THP turbo and its naturally aspirated sibling, the 1.6 VTi, make up the Prince family, developed together with BMW and also used by MINI: they do not have a reputation for reliability. Turbo versions built before 2012 carry a known problem of timing chain stretch, and the whole block shares a water pump described as fragile; the turbo versions add oil consumption and high-pressure fuel pump failures.^{[7][8][9][10]}

See the 5 of the 1.6 THP faults

Side-by-side comparison

Comparison of 1.4 T-Jet and 1.6 THP
Item	1.4 T-Jet	1.6 THP
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	1,368 cm³	1,598 cm³
Timing	Timing belt (dry)	Chain
Power	105–205 hp	120–270 hp
Production	2007–2024^{[11][12][13][14]}	2006–2018^[7][15][16]
Reliability
Risk index (what is it?)	48Moderate risk	64High risk
Documented faults	4	5
Of high or critical severity	1	2
Worst severity	High severity	Critical severity
Main faults	High severity: Premature turbocharger failure or wear Medium severity: MultiAir (UniAir) electro-hydraulic unit failure Medium severity: High oil consumption	Critical severity: Timing chain and tensioner stretch (turbo versions, before 2012) High severity: Fragile water pump and heat exchanger Medium severity: High-pressure fuel pump (HPFP) failure on the turbo versions
Most expensive documented repair	up to €2,300Premature turbocharger failure or wearPublished figure^[1][2]	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	1.4 16v Turbo T-Jet (without MultiAir, 2007-2010)^[6][17][18] 1.4 MultiAir Turbo (2009-2020)^{[1][2][3][4][5][19][20]}	1.6 VTi 120 / 1.6 16v (EP6/EP6C, N12/N16, naturally aspirated)^[10] 1.6 THP medium output (EP6DT/EP6DTS/EP6CDT, N14/N18; 140-190 hp)^[8][9][21] 1.6 THP high performance (EP6CDXD/EP6FDTR/EP6CDTR, John Cooper Works N14/N18; 200-270 hp)^[8][9][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

1.4 T-Jet

See the 13 models with the 1.4 T-Jet

1.6 THP

See the 16 models with the 1.6 THP

Other comparisons

With the 1.4 T-Jet

With the 1.6 THP

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.

Fiat 500X : les plus et les moinsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiat 500X : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Alfa Romeo MiTo : les plus et les moinsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Alfa Romeo MiTo : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Alfa Romeo Giulietta : les plus et les moinsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiat Tipo : les plus et les moinsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Prince engineWikipedia (inglés) · Other source · consulted 27 September 2026
Distribution : les moteurs à problèmesFiches-auto.fr · Motoring press · published April 2025 · consulted 27 September 2026 · in French
Moteurs essence qui consomment de l'huileFiches-auto.fr · Motoring press · published April 2024 · consulted 27 September 2026 · in French
Liste des moteurs qui ont des soucis de refroidissementFiches-auto.fr · Motoring press · published April 2025 · consulted 27 September 2026 · in French
Motor T-JetWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
Fiat FIRE engineWikipedia (inglés) · Other source · consulted 27 September 2026
MultiAirWikipedia (inglés) · Other source · consulted 27 September 2026
Motor FIREWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
Peugeot 308Wikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
Peugeot RCZWikipedia (inglés) · Other source · consulted 27 September 2026
Fiat Bravo (2007-2014) : les plus et les moinsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiat 500 (2007) : les plus et les moinsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Jeep Renegade : les plus et les moinsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Jeep Compass : les plus et les moinsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
BMW Recalls Fuel Pumps. Mini Does NotMotoringFile · Motoring press · published 27 October 2010 · consulted 27 September 2026