1.5 EcoBoost vs VR6: which engine is more reliable?

According to our risk index, the 1.5 EcoBoost carries less risk than the VR6: 43/100 (moderate risk) versus 50/100 (high risk). The 1.5 EcoBoost has 2 documented serious faults, the main one being «Coolant loss through a microcrack in the engine block (4-cylinder 1.5)»; the VR6 has 1 documented serious fault, the main one being «VR6 timing chain and tensioners».

Risk index

1.5 EcoBoost

Moderate risk · 2 serious faults

Lower risk

Risk index

VR6

High risk · 1 serious fault

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

Reviewed on 2 November 202626 sources How we work

Is the 1.5 EcoBoost reliable?

These are two engines with the same name. The four-cylinder (2014-2019: Mondeo, Focus, Kuga, C-Max) has documented cases of coolant loss through a microcrack in the block, which can end in a new engine. The three-cylinder Dragon (from 2018) has hardly any mechanical faults cited, but the Kuga has been recalled several times because an injector can crack and cause a fuel leak with a fire risk.^[1][2][3][4]

See the 2 of the 1.5 EcoBoost faults

Is the VR6 reliable?

Its best-documented faults are the timing chain, with tensioners on the 12-valve versions and stretching on the 3.2 (R32, A3 8P, TT, Cayenne), and, to a lesser extent, the cooling system of the 12-valve versions. The 3.6 FSI comes out of the sources better than the 3.2.^[5][6][7]

See the 2 of the VR6 faults

Side-by-side comparison

Comparison of 1.5 EcoBoost and VR6
Item	1.5 EcoBoost	VR6
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	1,498 cm³	—
Timing	Chain	Chain
Power	120–200 hp	140–300 hp
Production	since 2014^{[8][9][10][11][12]}	1991–2024^[13][14][15]
Reliability
Risk index (what is it?)	43Moderate risk	50High risk
Documented faults	2	2
Of high or critical severity	2	1
Worst severity	Critical severity	Critical severity
Main faults	Critical severity: Coolant loss through a microcrack in the engine block (4-cylinder 1.5) Critical severity: Fuel leak from cracked injectors, with a fire risk (Kuga Dragon)	Critical severity: VR6 timing chain and tensioners Medium severity: 12-valve VR6 cooling: water pump, thermostat and plastic pipes
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	1.5 EcoBoost 4-cylinder 120/150/160/182 hp (Mondeo, Focus, Kuga, C-Max, S-Max, Galaxy, 2014-2019)^[1][2] 1.5 EcoBoost Dragon 3-cylinder 120/150/182 hp (Kuga III and Focus IV, from 2018)^{[3][4][16][17]} 1.5 EcoBoost ST 200 hp (Fiesta ST 2018-2023 and Puma ST, code YZJA)^[3][10][18]	2.8 VR6 12V 140-174 hp (AAA, AMY, AES; 1991-2000)^[5][19] 2.9 VR6 12V 190 hp (ABV; 1994-1997)^[5] 2.8 V6 24V 204 hp (AQP, AUE, BDE, AMV, AYL; 1999-2008)^[6][20][21] 3.2 VR6 220-250 hp (BFH, BML, BDB, BMJ, BUB, BHE, BDL, BKK, AZZ, AXZ, CBRA; 2001-2010)^{[6][7][22][23]} 3.6 VR6 FSI 249-300 hp (BLV, BWS, CDVA, CCZB, CNNA, CMTA; 2005-2018)^{[7][24][25][26]}
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

1.5 EcoBoost

See the 10 models with the 1.5 EcoBoost

VR6

See the 24 models with the VR6

Other comparisons

With the 1.5 EcoBoost

With the VR6

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.

Ford Mondeo V - Auto ReviewANWB · Consumer association · published 2 September 2024 · consulted 8 October 2026 · in Dutch
Ford EcoBoost Probleme und Haltbarkeitgebrauchtwagenberater.de · Motoring press · consulted 8 October 2026 · in German
Rückruf: Bei diesen Ford-Modellen besteht BrandgefahrADAC · Motoring press · published 2 February 2026 · consulted 8 October 2026 · in German
Rückruf Ford Kuga: Brandgefahr wegen defekter Einspritzventileauto motor und sport · Motoring press · published 3 May 2024 · consulted 8 October 2026 · in German
VW Golf III VR6 (1991-1998)AutoBild · Motoring press · published 1 September 2003 · consulted 2 November 2026 · in German
VW Golf IV (1J): Schwachstellen und KaufberatungGebrauchtwagenberater.de · Motoring press · consulted 2 November 2026 · in German
Gebrauchtwagen-Kaufberater: Was kann der Porsche Cayenne 9PA?AutoScout24 · Motoring press · consulted 2 November 2026 · in German
Ford EcoBoost engineWikipedia (en) · Other source · consulted 8 October 2026
Ford EcoBoostWikipedia (de) · Other source · consulted 8 October 2026 · in German
Every Ford Powered By The 1.5L EcoBoost 'Dragon'SlashGear · Motoring press · consulted 8 October 2026
Ford Kuga Titanium 1.5 EcoBoost Auto-Start-Stop 150 CV 4x2 (2014-2016): precio y ficha técnicakm77 · Technical documentation · consulted 8 October 2026 · in Spanish
Ford Kuga MK3 2019-2026 Probleme und Schwachstellengebrauchtwagenberater.de · Motoring press · consulted 8 October 2026 · in German
VR6 engineWikipedia (inglés) · Other source · consulted 2 November 2026
VR6-MotorWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
VW EA390Wikipedia (alemán) · Other source · consulted 2 November 2026 · in German
Trois problèmes avec le Ford Kuga : jauge de carburant, injecteurs et toit panoramique défectueuxcar-recalls.eu · Other source · consulted 8 October 2026 · in French
Tous les problèmes sur Ford FOCUS 4 2018 (93 témoignages)fiches-auto.fr · Owners' forum · consulted 8 October 2026 · in French
YZJA engine (Ford 1.5 EcoBoost)Motorinsel · Technical documentation · consulted 8 October 2026
Tous les problèmes sur Volkswagen Golf III (1991-1998)Fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French
Seat Leon I: Bekannte Probleme & RückrufeGebrauchtwagenberater.de · Motoring press · published 9 April 2025 · consulted 2 November 2026 · in German
VW Bora (1J2): Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 14 July 2022 · consulted 2 November 2026 · in German
VW Golf 4: ProblemeCarWiki.de · Other source · consulted 2 November 2026 · in German
Audi TT: ProblemeCarWiki.de · Other source · consulted 2 November 2026 · in German
VW Passat CC: Probleme und SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 2 November 2026 · in German
Probleme mit dem Porsche Cayenne (9PA y 92A)CarWiki.de · Other source · consulted 2 November 2026 · in German
Tous les problèmes sur Volkswagen Passat (2004-2010)Fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French