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1.5 VTi-TECH / T-GDI vs Porsche MA1 / 9A1: which engine is more reliable?

According to our risk index, the 1.5 VTi-TECH / T-GDI carries less risk than the Porsche MA1 / 9A1: 7/100 (low risk) versus 25/100 (moderate risk). The 1.5 VTi-TECH / T-GDI has no documented serious faults; 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

1.5 VTi-TECH / T-GDI

7

Low risk · 0 serious faults

Lower risk

Risk index

Porsche MA1 / 9A1

25

Moderate risk · 1 serious fault

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

23 sourcesHow we work

Is the 1.5 VTi-TECH / T-GDI reliable?

MG/SAIC's "1.5" covers two different engines: the naturally aspirated VTi-TECH (106 hp), the entry-level engine in the MG ZS, and the turbocharged T-GDI (162-170 hp), found only in the MG HS and as the petrol engine in its plug-in hybrids. Neither has well-documented engine faults in independent sources yet: the complaints published concern electronics, the automatic gearbox and finish, not the engine block.[1][2][3][4][5][6]

See the 2 of the 1.5 VTi-TECH / T-GDI 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.[7][8][9][10]

See the 3 of the Porsche MA1 / 9A1 faults

Side-by-side comparison

Comparison of 1.5 VTi-TECH / T-GDI and Porsche MA1 / 9A1
1.5 VTi-TECH / T-GDIPorsche MA1 / 9A1
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement——
TimingChainChain
Power106–170 hp255–400 hp
Productionsince 2017[1][2][11][12][13]2009–2016[7][10][14][15][16][17][18]
Reliability
Risk index (what is it?)7Low risk25Moderate risk
Documented faults23
Of high or critical severity01
Worst severityLow severityCritical severity
Main faults
  1. Low severity: Jerky or harsh automatic gearbox shifts when cold or at low speed (MG HS)
  2. Low severity: Electronic warnings and occasional sensor faults (MG HS)
  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 repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versions
  • 1.5 VTi-TECH naturally aspirated 106 hp (NSE / NSE Plus, from 2017)[4]
  • 1.5 VTi-TECH naturally aspirated 106 hp (15S4C, MG3, 2013–2024)[19]
  • 3.6 Carrera 345 hp (MA1.02, 2009-2012)[7][9][10]
  • 3.8 Carrera S 385 hp (MA1.01, 2009-2012)[9][10]
  • 2.9 Boxster/Cayman 255-265 hp (MA1.20, 2009-2012, no direct injection)[8][14]
With cautionVersions to be cautious about
  • 1.5 T-GDI turbo 162 hp (GS61H, 2018-2024)[5][6][20][21]
  • 1.5 T-GDI turbo 170 hp (15FDE / 15FKE, from 2024)[2]
  • 3.4 Boxster S / Cayman S 310-320 hp (MA1.21/.22, 2009-2012, direct injection)[8][22]
  • 3.4 Carrera 350 hp (MA1.04, 2011-2015)[9]
  • 3.8 Carrera S 400 hp (MA1.03, 2011-2015)[9]
  • 2.7 Boxster/Cayman 265-275 hp (MA1.22, 2012-2016)[22][23]
  • 3.4 Boxster S / Cayman S / GTS 315-340 hp (MA1.23, 2012-2016)[22][23]
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

1.5 VTi-TECH / T-GDI

Porsche MA1 / 9A1

Other comparisons

With the 1.5 VTi-TECH / T-GDI

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. MG ZS (crossover)Wikipedia (inglés) · Other source · consulted 27 September 2026
  2. MG HSWikipedia (inglés) · Other source · consulted 27 September 2026
  3. Essai complet : MG ZSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
  4. Fiabilité et pannes du MG ZSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
  5. Fiabilité et pannes du MG eHSFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
  6. MG HS PHEV: guía definitiva de problemas y soluciones del SUV, el híbrido enchufable más vendidoAutopista.es · Motoring press · published 10 November 2025 · consulted 27 September 2026 · in Spanish
  7. The Definitive Guide To Porsche 997 Engines (M96.05, M97, MA1)FCP Euro · Other source · published 16 January 2024 · consulted 2 November 2026
  8. Porsche 987: The Cayman and Boxster Generation GuideRenn Driver · Other source · published 1 November 2026 · consulted 2 November 2026
  9. Porsche 911: 5 Generationen im Gebrauchtwagen-CheckAUTO BILD · Motoring press · published 22 September 2026 · consulted 2 November 2026 · in German
  10. Porsche 997Wikipedia · Other source · consulted 2 November 2026
  11. MG HSWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  12. MG HSWikipedia (francés) · Other source · consulted 27 September 2026 · in French
  13. List of General Motors enginesWikipedia (inglés) · Other source · consulted 27 September 2026
  14. Porsche Boxster and Cayman (987)Wikipedia · Other source · consulted 2 November 2026
  15. Porsche 991Wikipedia · Other source · consulted 2 November 2026
  16. Porsche Boxster and Cayman (981)Wikipedia · Other source · consulted 2 November 2026
  17. Differences between M96 and M97 enginesFlat Six Innovations · Other source · published 25 November 2025 · consulted 2 November 2026
  18. List of Porsche enginesWikipedia · Other source · consulted 2 November 2026
  19. Témoignages de fiabilité MG (MG3 1.5 VTi-Tech 106 ch sin testimonios; solo los del híbrido de 2024)Fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French
  20. MG – Common problems (llamadas a revisión de la UE y del Reino Unido)car-recalls.eu · Other source · consulted 30 October 2026
  21. MG HS SUV (2019-2024) Exclusive 1.5T-GDI 5d: opinión de propietario (10 jun 2022)Parkers · Owners' forum · published 10 June 2022 · consulted 30 October 2026
  22. Porsche Cayman and Boxster Common Problems: A Specialist Field GuideForeign Automotive · Other source · consulted 2 November 2026
  23. Porsche 981: The Cayman and Boxster Generation GuideRenn Driver · Other source · consulted 2 November 2026