1.0 EcoBoost vs 1.8 and 2.0 Zetec-E: which engine is more reliable?

According to our risk index, the 1.8 and 2.0 Zetec-E carries less risk than the 1.0 EcoBoost: 30/100 (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 1.8 and 2.0 Zetec-E has no documented serious faults.

Risk index

1.0 EcoBoost

High risk · 3 serious faults

Risk index

1.8 and 2.0 Zetec-E

Moderate risk · 0 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 2 November 202618 sources How 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 1.8 and 2.0 Zetec-E reliable?

The 1.8 and 2.0 litre Zetec-E engines in the Focus I are simple naturally aspirated petrol engines that, according to the sources, have no recurring serious fault. The most frequently mentioned issue is the plastic thermostat housing, which deforms and leaks coolant; in addition, Ford issued a recall in 2000 to replace the oil filler cap on 1.8 and 2.0 units built up to December 1999.^[5][6][7]

See the 3 of the 1.8 and 2.0 Zetec-E faults

Side-by-side comparison

Comparison of 1.0 EcoBoost and 1.8 and 2.0 Zetec-E
Item	1.0 EcoBoost	1.8 and 2.0 Zetec-E
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	999 cm³	—
Timing	Wet belt (belt-in-oil)	Timing belt (dry)
Power	100–155 hp	115–130 hp
Production	since 2012^{[1][8][9][10]}	1991–2004^[5][11][12]
Reliability
Risk index (what is it?)	71High risk	30Moderate risk
Documented faults	4	3
Of high or critical severity	3	0
Worst severity	Critical severity	Medium severity
Main faults	Critical severity: Degradation of the timing belt running in oil Critical severity: Oil pump belt and tensioner failure Critical severity: Coolant leaks and overheating from the turbo hose	Medium severity: Plastic thermostat housing: coolant leaks Medium severity: Loose oil filler cap and oil leak onto the exhaust Low severity: Dirty idle control valve: unstable idle
Most expensive documented repair	up to €1,200Degradation of the timing belt running in oilPublished figure^[2]	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	1.0 EcoBoost 100/125 (Fox, 2012-2017)^[2][3][13] 1.0 EcoBoost 100/125/140 with cylinder deactivation (from ~2017)^[14][15] 1.0 EcoBoost Hybrid 48V mild hybrid (125/155 hp, from 2019)^[1][16]	1.8 Zetec-E 16v 115 hp (Focus I, 1998-2004)^[5][6] 2.0 Zetec-E 16v 130 hp (Focus I, 1998-2004)^[5][6][17] 1.6 Zetec-E 16v 90 and 95 hp (Mondeo II, 1996-2000)^[11][18] 1.8 Zetec-E 16v 115 hp (Mondeo II, 1996-2000)^[18] 2.0 Zetec-E 16v 131 hp (Mondeo II, 1996-2000)^[18]
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

1.0 EcoBoost

See the 12 models with the 1.0 EcoBoost

1.8 and 2.0 Zetec-E

Other comparisons

With the 1.0 EcoBoost

With the 1.8 and 2.0 Zetec-E

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 EcoBoost engineWikipedia · Other source · consulted 26 September 2026
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
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
Gripa el motor por problema en el manguito se queda sin refrigeranteOpinautos · Owners' forum · consulted 26 September 2026 · in Spanish
Ford Focus MK1 – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 5 October 2023 · consulted 2 November 2026 · in German
Fiabilité et pannes du Ford Focus 1 (1998-2004)fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French
Ford Focus recall R/2000/003: oil filler cap may become looseAutoinsider (datos DVSA) · Other source · published 20 March 2000 · consulted 2 November 2026
Prueba: Ford Fiesta 1.0 EcoBoost 100 CV (2013)km77 · Motoring press · consulted 26 September 2026 · in Spanish
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
Ford B-MAX Trend 1.0 EcoBoost 100 CV (2012-2018): precio y ficha técnicakm77 · Technical documentation · consulted 26 September 2026 · in Spanish
Ford Zeta engineWikipedia (inglés) · Other source · consulted 2 November 2026
Ford FocusWikipedia (español) · Other source · consulted 2 November 2026 · in Spanish
Ford EcoBoost engines: reliability, problems and should you buy one?Carbuyer · Motoring press · consulted 26 September 2026
Ford's Self-Clogging 1.0-Liter EcoBoost Engine Is Finally Getting RecalledThe Drive · Motoring press · consulted 26 September 2026
The Largest Ford EcoBoost Recalls In 15 Years Of ProductionCarBuzz · Motoring press · consulted 26 September 2026
Stellantis no es el único afectado por la correa de distribución bañada en aceiteAutofácil · Motoring press · consulted 26 September 2026 · in Spanish
Ford Focus [MK1] [C170] (2002 - 2005) used car model guideExchange & Mart · Motoring press · consulted 2 November 2026
Ford Mondeo 1993-2001: fiabilité et pannes (témoignages)fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French