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

According to our risk index, the 1.0 SCe (B4D) carries less risk than the 0.9 TCe: 23/100 (low risk) versus 49/100 (moderate risk). The 0.9 TCe has 3 documented serious faults, the main one being «Coolant leak at the thermostat housing»; the 1.0 SCe (B4D) has no documented serious faults.

Risk index

0.9 TCe

Moderate risk · 3 serious faults

Risk index

1.0 SCe (B4D)

Low 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 27 September 202610 sources How we work

Is the 0.9 TCe reliable?

The 0.9 TCe (H4Bt) is a three-cylinder turbo with a good reliability reputation, better than that of its sibling the 1.2 TCe: it does not share the same oil consumption or the same rate of chain problems. Its most-cited weak point is a coolant leak at the thermostat housing, which if ignored can end up damaging the head gasket; chain, turbo and lambda sensor cases appear less often.^[1][2]

See the 5 of the 0.9 TCe faults

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.^[3][4][5]

See the 4 of the 1.0 SCe (B4D) faults

Side-by-side comparison

Comparison of 0.9 TCe and 1.0 SCe (B4D)
Item	0.9 TCe	1.0 SCe (B4D)
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	898 cm³	999 cm³
Timing	Chain	Chain
Power	90 hp	70–75 hp
Production	2012–2024^{[1][2][6][7][8]}	2014–2024^[9][10]
Reliability
Risk index (what is it?)	49Moderate risk	23Low risk
Documented faults	5	4
Of high or critical severity	3	0
Worst severity	Critical severity	Medium severity
Main faults	High severity: Coolant leak at the thermostat housing Critical severity: Timing chain or tensioner failure High severity: Turbocharger wear or failure	Medium severity: Clutch that slips or judders, especially when cold Medium severity: Jerking, rough idle or warning light from sensors and ignition coils Low severity: Higher-than-normal oil consumption (especially on the Dacia Sandero II)
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	0.9 TCe 90 (H4Bt, 2012-2024)^[1][2]	1.0 SCe 70/75 (B4D, 2014-2024)^[3][4][5]
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

0.9 TCe

See the 8 models with the 0.9 TCe

1.0 SCe (B4D)

Other comparisons

With the 0.9 TCe

With the 1.0 SCe (B4D)

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Sources

Every fact on this page links to its source. If you find an error, let us know.

Fiabilité des 0.9 TCeFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Moteur H Renault-NissanWikipedia (francés) · Other source · consulted 27 September 2026 · in French
Fiabilité et pannes de la Dacia Sandero 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes du Dacia Logan 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes de la Renault Twingo 3Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Mercedes-Benz M281 engineWikipedia (inglés) · Other source · consulted 27 September 2026
Renault ClioWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
Dacia SanderoWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
List of Renault enginesWikipedia (inglés) · Other source · consulted 27 September 2026
Renault TwingoWikipedia (inglés) · Other source · consulted 27 September 2026