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Skyactiv-G vs 1.8 TCe: which engine is more reliable?

According to our risk index, the Skyactiv-G carries less risk than the 1.8 TCe: 25/100 versus 32/100 (both moderate risk). The Skyactiv-G has no documented serious faults; the 1.8 TCe has 2 documented serious faults, the main one being «A110 oil pressure solenoid valve sticking in 2018–2019 cars».

Risk index

Skyactiv-G

25

Moderate risk · 0 serious faults

Lower risk

Risk index

1.8 TCe

32

Moderate risk · 2 serious faults

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

13 sourcesHow we work

Is the Skyactiv-G reliable?

The Skyactiv-G is a naturally aspirated petrol engine that the German specialist press consistently describes as reliable, with no documented pattern of serious engine faults in any Mazda model reviewed. Its weak point, shared with almost any direct-injection petrol engine, is carbon build-up in the intake; in addition, 2017-2020 units had recalls for software and for the fuel pump, since fixed by the manufacturer.[1][2][3][4]

See the 5 of the Skyactiv-G faults

Is the 1.8 TCe reliable?

The 1.8 TCe (M5P) in the Alpine A110 and the Mégane R.S. IV has no documented endemic faults. What has been published are recalls for the A110: the oil pressure solenoid valve (2019) and the fuel pump (2021 and 2023). We have found no recalls or complaints about this engine in the Mégane R.S.[5][6][7][8]

See the 2 of the 1.8 TCe faults

Side-by-side comparison

Comparison of Skyactiv-G and 1.8 TCe
Skyactiv-G1.8 TCe
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement—1,798 cm³
TimingChain—
Power75–187 hp252–350 hp
Productionsince 2011[1][9]2017–2026[8][10][11]
Reliability
Risk index (what is it?)25Moderate risk32Moderate risk
Documented faults52
Of high or critical severity02
Worst severityMedium severityHigh severity
Main faults
  1. Medium severity: Intake shut-off valve software issue and engine stalling
  2. Medium severity: Micro-cracks in the fuel pump impeller
  3. Medium severity: ECU programming and loss of power (CX-5 II and Mazda3 IV)
  1. High severity: A110 oil pressure solenoid valve sticking in 2018–2019 cars
  2. High severity: A110 fuel pump that can leave the car unable to start when hot
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versions
  • 1.8 TCe 280–300 hp (M5P, Mégane R.S. IV, 2018–2023)[5][7][8]
With cautionVersions to be cautious aboutNone
  • 1.8 TCe 252–350 hp (M5P, Alpine A110, 2017–2026)[5][7]
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

Other comparisons

With the Skyactiv-G

With the 1.8 TCe

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. SkyactivWikipedia (inglés) · Other source · consulted 27 September 2026
  2. Mazda 3 (BM/BN, 2013-2019) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  3. Mazda 6 (GJ, III) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  4. Mazda CX-5 II (KF) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  5. Rappels Alpine A110 (2019). Risque de casse moteurL'argus · Motoring press · published 28 August 2019 · consulted 31 October 2026 · in French
  6. Rappel Alpine A110. La pompe à essence de 2 849 exemplaires remplacéeL'argus · Motoring press · published 7 September 2021 · consulted 31 October 2026 · in French
  7. Alpine A110. Un nouveau rappel pour remplacer des pompes à essenceL'argus · Motoring press · published 25 October 2023 · consulted 31 October 2026 · in French
  8. Renault Mégane IVWikipedia (fr) · Other source · consulted 31 October 2026 · in French
  9. List of Mazda enginesWikipedia (inglés) · Other source · consulted 27 September 2026
  10. Alpine A110 (2017)Wikipedia (en) · Other source · consulted 31 October 2026
  11. Alpine A110 (2017)Wikipedia (fr) · Other source · consulted 31 October 2026 · in French
  12. Mazda 2 (DJ) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
  13. Mazda 3 IV (BP) – Erfahrungen & ProblemeGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German