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MotorFiable

1.0 SCe (B4D) vs 1.8 TCe: which engine is more reliable?

According to our risk index, the 1.0 SCe (B4D) carries less risk than the 1.8 TCe: 23/100 (low risk) versus 32/100 (moderate risk). The 1.0 SCe (B4D) 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

1.0 SCe (B4D)

23

Low 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

11 sourcesHow we work

Is the 1.0 SCe (B4D) reliable?

The 1.0 SCe (B4D) is a simple, low-power (70-75 hp) naturally aspirated three-cylinder engine, with no serious or systemic faults documented. Its most cited issues are a clutch that can slip or judder when cold and, more occasionally on the Dacia Sandero II, higher-than-normal oil consumption; there is no pattern of faults in the chain-driven timing.[1][2][3]

See the 4 of the 1.0 SCe (B4D) 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.[4][5][6][7]

See the 2 of the 1.8 TCe faults

Side-by-side comparison

Comparison of 1.0 SCe (B4D) and 1.8 TCe
1.0 SCe (B4D)1.8 TCe
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement999 cm³1,798 cm³
TimingChain—
Power70–75 hp252–350 hp
Production2014–2024[8][9]2017–2026[7][10][11]
Reliability
Risk index (what is it?)23Low risk32Moderate risk
Documented faults42
Of high or critical severity02
Worst severityMedium severityHigh severity
Main faults
  1. Medium severity: Clutch that slips or judders, especially when cold
  2. Medium severity: Jerking, rough idle or warning light from sensors and ignition coils
  3. Low severity: Higher-than-normal oil consumption (especially on the Dacia Sandero II)
  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 versionsNone
  • 1.8 TCe 280–300 hp (M5P, Mégane R.S. IV, 2018–2023)[4][6][7]
With cautionVersions to be cautious about
  • 1.8 TCe 252–350 hp (M5P, Alpine A110, 2017–2026)[4][6]
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 SCe (B4D)

1.8 TCe

Other comparisons

With the 1.0 SCe (B4D)

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. Fiabilité et pannes de la Dacia Sandero 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  2. Fiabilité et pannes du Dacia Logan 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  3. Fiabilité et pannes de la Renault Twingo 3Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  4. Rappels Alpine A110 (2019). Risque de casse moteurL'argus · Motoring press · published 28 August 2019 · consulted 31 October 2026 · in French
  5. 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
  6. Alpine A110. Un nouveau rappel pour remplacer des pompes à essenceL'argus · Motoring press · published 25 October 2023 · consulted 31 October 2026 · in French
  7. Renault Mégane IVWikipedia (fr) · Other source · consulted 31 October 2026 · in French
  8. List of Renault enginesWikipedia (inglés) · Other source · consulted 27 September 2026
  9. Renault TwingoWikipedia (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