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1.0 EcoBoost vs 2.3 VR5 (V5): which engine is more reliable?

According to our risk index, the 2.3 VR5 (V5) carries less risk than the 1.0 EcoBoost: 32/100 (moderate risk) versus 71/100 (high risk). The 1.0 EcoBoost has 3 documented serious faults, the main one being «Degradation of the timing belt running in oil»; the 2.3 VR5 (V5) has 1 documented serious fault, the main one being «Timing chain stretch».

Risk index

1.0 EcoBoost

71

High risk · 3 serious faults

Risk index

2.3 VR5 (V5)

32

Moderate risk · 1 serious fault

Lower risk

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

18 sourcesHow we work

Is the 1.0 EcoBoost reliable?

It is a turbocharged direct-injection three-cylinder that has won Engine of the Year several times, but it has two very well-documented weak points: two belts running in oil (timing and oil pump) that can disintegrate and seize the engine, and cases of coolant leaks and overheating in early units. It is best bought with a service history and the belts checked or replaced on time.[1][2][3][4]

See the 4 of the 1.0 EcoBoost faults

Is the 2.3 VR5 (V5) reliable?

The 2.3-litre VR5 is a naturally aspirated five-cylinder with the timing chain at the rear of the engine. Gebrauchtwagenberater rates it as a buy with no known problems in the Golf IV, but in the Bora it warns that the chain sometimes stretches; AutoHints adds the coils and the plastic coolant parts as points to watch.[5][6][7][8]

See the 3 of the 2.3 VR5 (V5) faults

Side-by-side comparison

Comparison of 1.0 EcoBoost and 2.3 VR5 (V5)
1.0 EcoBoost2.3 VR5 (V5)
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement999 cm³2,324 cm³
TimingWet belt (belt-in-oil)Chain
Power100–155 hp150–170 hp
Productionsince 2012[1][9][10][11]1997–2006[12][13][14]
Reliability
Risk index (what is it?)71High risk32Moderate risk
Documented faults43
Of high or critical severity31
Worst severityCritical severityHigh severity
Main faults
  1. Critical severity: Degradation of the timing belt running in oil
  2. Critical severity: Oil pump belt and tensioner failure
  3. Critical severity: Coolant leaks and overheating from the turbo hose
  1. High severity: Timing chain stretch
  2. Medium severity: Faulty ignition coils
  3. Medium severity: Coolant leaks from the hoses and thermostat housing
Most expensive documented repairup to €1,200Degradation of the timing belt running in oilPublished figure[2]No reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • 1.0 EcoBoost 100/125 (Fox, 2012-2017)[2][3][15]
  • 1.0 EcoBoost 100/125/140 with cylinder deactivation (from ~2017)[16][17]
  • 1.0 EcoBoost Hybrid 48V mild hybrid (125/155 hp, from 2019)[1][18]
  • 2.3 VR5 10v 150 hp (AGZ; 1997-2001)[6][7]
  • 2.3 VR5 20v 170 hp (AQN, AZX; 2000-2006)[6][8]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

1.0 EcoBoost

See the 12 models with the 1.0 EcoBoost

2.3 VR5 (V5)

Other comparisons

With the 1.0 EcoBoost

With the 2.3 VR5 (V5)

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.

  1. Ford EcoBoost engineWikipedia · Other source · consulted 26 September 2026
  2. Alerta Ford: la correa de distribución del 1.0 EcoBoost puede romper el motor y la NHTSA ya investigaMotor16 · Motoring press · consulted 26 September 2026 · in Spanish
  3. Los Ford 1.0 EcoBoost tricilíndricos están dando problemas de correas bañadas que recuerdan al caso PureTechMotor.es · Motoring press · consulted 26 September 2026 · in Spanish
  4. Gripa el motor por problema en el manguito se queda sin refrigeranteOpinautos · Owners' forum · consulted 26 September 2026 · in Spanish
  5. VW Golf 4: Typische Probleme und SchwachstellenGebrauchtwagenberater.de · Motoring press · published 2 September 2026 · consulted 2 November 2026 · in German
  6. VW Bora (1J2) – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 14 July 2022 · consulted 2 November 2026 · in German
  7. Engine 2.3 VR5 (AGZ) 150 HP: Experiences, problems, fuel consumption and used-car buying tipsAutoHints · Technical documentation · published 24 July 2025 · consulted 2 November 2026
  8. Volkswagen 2.3 VR5 20V (AQN): Experiences, problems, fuel consumption and used car buying tipsAutoHints · Technical documentation · published 24 July 2025 · consulted 2 November 2026
  9. Prueba: Ford Fiesta 1.0 EcoBoost 100 CV (2013)km77 · Motoring press · consulted 26 September 2026 · in Spanish
  10. Ford Mondeo Berlina Trend 1.0 EcoBoost 92 kW (125 CV) (2015-2018): precio y ficha técnicakm77 · Technical documentation · consulted 26 September 2026 · in Spanish
  11. Ford B-MAX Trend 1.0 EcoBoost 100 CV (2012-2018): precio y ficha técnicakm77 · Technical documentation · consulted 26 September 2026 · in Spanish
  12. VR5 engineWikipedia (inglés) · Other source · consulted 2 November 2026
  13. List of discontinued Volkswagen Group petrol enginesWikipedia (inglés) · Other source · consulted 2 November 2026
  14. VR-MotorWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  15. Ford EcoBoost engines: reliability, problems and should you buy one?Carbuyer · Motoring press · consulted 26 September 2026
  16. Ford's Self-Clogging 1.0-Liter EcoBoost Engine Is Finally Getting RecalledThe Drive · Motoring press · consulted 26 September 2026
  17. The Largest Ford EcoBoost Recalls In 15 Years Of ProductionCarBuzz · Motoring press · consulted 26 September 2026
  18. Stellantis no es el único afectado por la correa de distribución bañada en aceiteAutofácil · Motoring press · consulted 26 September 2026 · in Spanish