1.0 SCe (B4D) vs 1.2 12V: which engine is more reliable?

According to our risk index, the 1.0 SCe (B4D) carries less risk than the 1.2 12V: 23/100 (low risk) versus 57/100 (high risk). The 1.0 SCe (B4D) has no documented serious faults; the 1.2 12V has 2 documented serious faults, the main one being «Timing chain stretch and tensioner wear».

Risk index

1.0 SCe (B4D)

Low risk · 0 serious faults

Lower risk

Risk index

1.2 12V

High risk · 2 serious faults

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

Reviewed on 27 September 202614 sources How 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 1.2 12V reliable?

The 1.2 12V is a simple, low-power, naturally aspirated three-cylinder engine (54-70 hp), with two documented design faults: the timing chain tensioner, which can end up destroying the engine, and -on the Volkswagen Polo IV- a catalytic converter too close to the cylinder head that can burn the exhaust valves. Ignition coil failures are also common, and there are isolated cases of oil consumption and vibration.^{[4][5][6][7][8]}

See the 5 of the 1.2 12V faults

Side-by-side comparison

Comparison of 1.0 SCe (B4D) and 1.2 12V
Item	1.0 SCe (B4D)	1.2 12V
Technical data
Type	Engine	Engine
Fuel	Petrol	Petrol
Displacement	999 cm³	1,198 cm³
Timing	Chain	Chain
Power	70–75 hp	54–70 hp
Production	2014–2024^[9][10]	2001–2014^[4][11][12]
Reliability
Risk index (what is it?)	23Low risk	57High risk
Documented faults	4	5
Of high or critical severity	0	2
Worst severity	Medium severity	Critical severity
Main faults	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)	Critical severity: Timing chain stretch and tensioner wear High severity: Cylinder head and valve damage from exhaust gas backflow (Volkswagen Polo IV) Medium severity: Higher-than-normal oil consumption
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	1.0 SCe 70/75 (B4D, 2014-2024)^[1][2][3]	1.2 54/60 hp (AWY, BMD, BBM, 2001-2014)^[4][6] 1.2 64/70 hp (BME, CGPA, 2002-2014)^{[4][6][13][14]}
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

1.0 SCe (B4D)

1.2 12V

See the 8 models with the 1.2 12V

Other comparisons

With the 1.0 SCe (B4D)

With the 1.2 12V

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.

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
VW Polo 4 (9N): Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Fiabilité et pannes de la Volkswagen Polo 4Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes de la Seat Ibiza (2008-2017)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Seat Ibiza III (2002-2008): Bekannte Probleme & KrankheitenGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
Fiabilité et pannes de la Seat Ibiza (2002-2008)Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
List of Renault enginesWikipedia (inglés) · Other source · consulted 27 September 2026
Renault TwingoWikipedia (inglés) · Other source · consulted 27 September 2026
VW EA111Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
VW Polo IVWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Fiabilité et pannes de la Volkswagen Polo 5Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité et pannes de la Skoda Fabia 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French