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BMW B48 / B38 vs 2.0 16v F4R and F4RT: which engine is more reliable?

According to our risk index, the BMW B48 / B38 carries less risk than the 2.0 16v F4R and F4RT: 24/100 (low risk) versus 25/100 (moderate risk). The BMW B48 / B38 has 1 documented serious fault, the main one being «Timing chain on the early units (2014-2018), redesigned in the B48TU»; the 2.0 16v F4R and F4RT has 1 documented serious fault, the main one being «Timing belt failure due to overdue maintenance».

Risk index

BMW B48 / B38

24

Low risk · 1 serious fault

Lower risk

Risk index

2.0 16v F4R and F4RT

25

Moderate risk · 1 serious fault

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 BMW B48 / B38 reliable?

The BMW B48 (2.0 turbo, from 2014) and its three-cylinder sibling, the B38 (1.5), have a reputation as reliable engines within BMW's modern range: there is no serious, widespread fault on record, unlike the timing chain on the N47 diesel or the EGR fire risk on the B47. Keep an eye on the cooling circuit, the oil seals near the turbo and the VANOS, and the carbon build-up typical of direct injection; BMW revised the timing chain in 2018 (B48TU update).[1][2][3]

See the 4 of the BMW B48 / B38 faults

Is the 2.0 16v F4R and F4RT reliable?

In the sources we consulted, the 2.0-litre F4R and F4RT show no engine-destroying design faults, but the timing belt must be changed on time, and the coils (RS) and the variable valve timing pulley appear as weak points. We have found no reliable sources on oil consumption or big-end bearings.[4][5][6][7]

See the 3 of the 2.0 16v F4R and F4RT faults

Side-by-side comparison

Comparison of BMW B48 / B38 and 2.0 16v F4R and F4RT
BMW B48 / B382.0 16v F4R and F4RT
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,998 cm³1,998 cm³
TimingChainTiming belt (dry)
Power136–312 hp135–250 hp
Productionsince 2014[1][8][9]since 2000[10]
Reliability
Risk index (what is it?)24Low risk25Moderate risk
Documented faults43
Of high or critical severity11
Worst severityHigh severityCritical severity
Main faults
  1. Medium severity: Deterioration of hoses and seals in the cooling circuit, with coolant loss
  2. Medium severity: Oil leaks or seepage from seals and covers, near the turbo and the VANOS
  3. High severity: Timing chain on the early units (2014-2018), redesigned in the B48TU
  1. Critical severity: Timing belt failure due to overdue maintenance
  2. Medium severity: Faulty camshaft variable valve timing pulley
  3. Medium severity: F4RT ignition coil failure
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versions
  • B38 1.5 136 hp (MINI Cooper, 118i)[2]
  • B48 2.0 178-197 hp (120i, 220i, 320i, 520i, X1/X2/X3 20i, MINI Cooper S)[2]
  • B48 2.0 252-258 hp (330i, 530i, X3/X4 xDrive30i)[2][11]
  • B48 2.0 up to 302-312 hp, high performance (MINI John Cooper Works, BMW X1 M35i)[2]
None
With cautionVersions to be cautious aboutNone
  • 2.0 16v naturally aspirated 135-197 hp (F4R)[4][5]
  • 2.0 turbo 165-250 hp (F4RT)[6][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

BMW B48 / B38

See the 20 models with the BMW B48 / B38

2.0 16v F4R and F4RT

Other comparisons

With the BMW B48 / B38

With the 2.0 16v F4R and F4RT

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 B48Wikipedia (inglés) · Other source · consulted 27 September 2026
  2. Motor BMW B48: defectos, mantenimiento y guía de compraRecambios y Accesorios BMW (blog) · Technical documentation · consulted 27 September 2026 · in Spanish
  3. BMW Reliability Has Changed, But the Internet Hasn't Caught UpBMWBLOG · Other source · published January 2026 · consulted 27 September 2026
  4. Pannes Renault Mégane 2 (testimonios por motorización)fiches-auto.fr · Other source · consulted 5 October 2026 · in French
  5. Fiabilité occasion Renault Mégane II (2002-2009)CarVerif · Other source · consulted 5 October 2026 · in French
  6. Renaultsport Megane checkpointsevo · Motoring press · published 20 November 2008 · consulted 5 October 2026
  7. RenaultSport Megane 225 buying guide, history and reviewOctane · Motoring press · published 7 February 2025 · consulted 5 October 2026
  8. BMW B38Wikipedia (inglés) · Other source · consulted 27 September 2026
  9. BMW B48Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  10. Moteur F Renault (F4R y F4RT)Wikipedia (fr) · Other source · consulted 5 October 2026 · in French
  11. 5 BMWs That Prove the B48 Four-Cylinder Engine Is Better Than You ThinkBMWBLOG · Other source · published April 2026 · consulted 27 September 2026