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BMW N20 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 BMW N20: 23/100 (low risk) versus 63/100 (high risk). The BMW N20 has 2 documented serious faults, the main one being «Timing chain guide and tensioner wear (2011-2015)»; the 1.0 SCe (B4D) has no documented serious faults.

Risk index

BMW N20

63

High risk · 2 serious faults

Risk index

1.0 SCe (B4D)

23

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

8 sourcesHow we work

Is the BMW N20 reliable?

The BMW N20 (2011-2017) was the first turbocharged four-cylinder with which BMW replaced its naturally aspirated six-cylinders in models such as the 320i, 328i and X3, and it is generally mechanically sound. Its best-documented weak point is the timing chain guides and tensioner on units built before 2015; oil leaks, the electric water pump and, to a lesser extent, the turbo and the high-pressure fuel pump are also known issues.[1][2]

See the 5 of the BMW N20 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 BMW N20 and 1.0 SCe (B4D)
BMW N201.0 SCe (B4D)
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,997 cm³999 cm³
TimingChainChain
Power156–245 hp70–75 hp
Production2011–2017[1][6]2014–2024[7][8]
Reliability
Risk index (what is it?)63High risk23Low risk
Documented faults54
Of high or critical severity20
Worst severityCritical severityMedium severity
Main faults
  1. Critical severity: Timing chain guide and tensioner wear (2011-2015)
  2. Critical severity: Electric water pump failure (BMW campaign in the US over fire risk)
  3. Medium severity: Oil leaks from the rocker cover gasket and the filter housing
  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)
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • N20B20 156 hp (115 kW, 2013-2016)[2]
  • N20B20B 184 hp (135 kW, 2011-2017)[2]
  • N20B20 218 hp (160 kW, 2012-2015)[2]
  • N20B20A 245 hp (180 kW, 2011-2017)[2]
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

BMW N20

See the 8 models with the BMW N20

1.0 SCe (B4D)

Other comparisons

With the BMW N20

With the 1.0 SCe (B4D)

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. BMW N20Wikipedia (inglés) · Other source · consulted 27 September 2026
  2. BMW N20 Engine: Pros, Cons, Reliability, Tuning, and Maintenance GuideBMW BLOG · Motoring press · published 8 June 2025 · consulted 27 September 2026
  3. Fiabilité et pannes de la Dacia Sandero 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  4. Fiabilité et pannes du Dacia Logan 2Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  5. Fiabilité et pannes de la Renault Twingo 3Fiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
  6. BMW N20Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  7. List of Renault enginesWikipedia (inglés) · Other source · consulted 27 September 2026
  8. Renault TwingoWikipedia (inglés) · Other source · consulted 27 September 2026