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1.0 EcoBoost vs Porsche MA1 / 9A1: which engine is more reliable?

According to our risk index, the Porsche MA1 / 9A1 carries less risk than the 1.0 EcoBoost: 25/100 (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 Porsche MA1 / 9A1 has 1 documented serious fault, the main one being «Bore scoring in the MA1 of the 997.2 and 987.2: uncommon, but documented».

Risk index

1.0 EcoBoost

71

High risk · 3 serious faults

Risk index

Porsche MA1 / 9A1

25

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

22 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 Porsche MA1 / 9A1 reliable?

Yes, it is noticeably more reliable than the M96/M97: it eliminated the intermediate shaft with its IMS bearing and, according to FCP Euro, the connecting rod bolt failures. What is documented is minor: carbon build-up on the intake valves caused by direct injection, coolant pump leaks on the 991.1 and, rarely, bore scoring on the 997.2.[5][6][7][8]

See the 3 of the Porsche MA1 / 9A1 faults

Side-by-side comparison

Comparison of 1.0 EcoBoost and Porsche MA1 / 9A1
1.0 EcoBoostPorsche MA1 / 9A1
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement999 cm³—
TimingWet belt (belt-in-oil)Chain
Power100–155 hp255–400 hp
Productionsince 2012[1][9][10][11]2009–2016[5][8][12][13][14][15][16]
Reliability
Risk index (what is it?)71High risk25Moderate risk
Documented faults43
Of high or critical severity31
Worst severityCritical severityCritical 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. Critical severity: Bore scoring in the MA1 of the 997.2 and 987.2: uncommon, but documented
  2. Medium severity: Carbon build-up on the intake valves caused by direct injection
  3. Medium severity: Leaks from the electronically controlled coolant pumps of the 991.1 and the plastic water pump
Most expensive documented repairup to €1,200Degradation of the timing belt running in oilPublished figure[2]No reliable data
Which versions to buy
BuyRecommended versionsNone
  • 3.6 Carrera 345 hp (MA1.02, 2009-2012)[5][7][8]
  • 3.8 Carrera S 385 hp (MA1.01, 2009-2012)[7][8]
  • 2.9 Boxster/Cayman 255-265 hp (MA1.20, 2009-2012, no direct injection)[6][12]
With cautionVersions to be cautious about
  • 1.0 EcoBoost 100/125 (Fox, 2012-2017)[2][3][17]
  • 1.0 EcoBoost 100/125/140 with cylinder deactivation (from ~2017)[18][19]
  • 1.0 EcoBoost Hybrid 48V mild hybrid (125/155 hp, from 2019)[1][20]
  • 3.4 Boxster S / Cayman S 310-320 hp (MA1.21/.22, 2009-2012, direct injection)[6][21]
  • 3.4 Carrera 350 hp (MA1.04, 2011-2015)[7]
  • 3.8 Carrera S 400 hp (MA1.03, 2011-2015)[7]
  • 2.7 Boxster/Cayman 265-275 hp (MA1.22, 2012-2016)[21][22]
  • 3.4 Boxster S / Cayman S / GTS 315-340 hp (MA1.23, 2012-2016)[21][22]
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

Porsche MA1 / 9A1

Other comparisons

With the 1.0 EcoBoost

With the Porsche MA1 / 9A1

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. The Definitive Guide To Porsche 997 Engines (M96.05, M97, MA1)FCP Euro · Other source · published 16 January 2024 · consulted 2 November 2026
  6. Porsche 987: The Cayman and Boxster Generation GuideRenn Driver · Other source · published 1 November 2026 · consulted 2 November 2026
  7. Porsche 911: 5 Generationen im Gebrauchtwagen-CheckAUTO BILD · Motoring press · published 22 September 2026 · consulted 2 November 2026 · in German
  8. Porsche 997Wikipedia · Other source · 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. Porsche Boxster and Cayman (987)Wikipedia · Other source · consulted 2 November 2026
  13. Porsche 991Wikipedia · Other source · consulted 2 November 2026
  14. Porsche Boxster and Cayman (981)Wikipedia · Other source · consulted 2 November 2026
  15. Differences between M96 and M97 enginesFlat Six Innovations · Other source · published 25 November 2025 · consulted 2 November 2026
  16. List of Porsche enginesWikipedia · Other source · consulted 2 November 2026
  17. Ford EcoBoost engines: reliability, problems and should you buy one?Carbuyer · Motoring press · consulted 26 September 2026
  18. Ford's Self-Clogging 1.0-Liter EcoBoost Engine Is Finally Getting RecalledThe Drive · Motoring press · consulted 26 September 2026
  19. The Largest Ford EcoBoost Recalls In 15 Years Of ProductionCarBuzz · Motoring press · consulted 26 September 2026
  20. Stellantis no es el único afectado por la correa de distribución bañada en aceiteAutofácil · Motoring press · consulted 26 September 2026 · in Spanish
  21. Porsche Cayman and Boxster Common Problems: A Specialist Field GuideForeign Automotive · Other source · consulted 2 November 2026
  22. Porsche 981: The Cayman and Boxster Generation GuideRenn Driver · Other source · consulted 2 November 2026