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BMW B48 / B38 vs M43 1.6, 1.8 and 1.9: which engine is more reliable?

According to our risk index, the BMW B48 / B38 carries less risk than the M43 1.6, 1.8 and 1.9: 24/100 (low risk) versus 42/100 (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 M43 1.6, 1.8 and 1.9 has 1 documented serious fault, the main one being «Failure of the plastic parts in the cooling system».

Risk index

BMW B48 / B38

24

Low risk · 1 serious fault

Lower risk

Risk index

M43 1.6, 1.8 and 1.9

42

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

13 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 M43 1.6, 1.8 and 1.9 reliable?

The M43 (1993-2002) is an 8-valve petrol four-cylinder with a timing chain that Autohints describes as one of BMW’s most durable engines of the nineties. The faults the sources cite are with ancillaries: plastic cooling parts, oil leaks from the gaskets, rough idle, ignition and, in some versions, the DISA valve.[4][5][6]

See the 5 of the M43 1.6, 1.8 and 1.9 faults

Side-by-side comparison

Comparison of BMW B48 / B38 and M43 1.6, 1.8 and 1.9
BMW B48 / B38M43 1.6, 1.8 and 1.9
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,998 cm³—
TimingChainChain
Power136–312 hp102–118 hp
Productionsince 2014[1][7][8]1993–2002[5][9][10]
Reliability
Risk index (what is it?)24Low risk42Moderate risk
Documented faults45
Of high or critical severity11
Worst severityHigh severityHigh 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. High severity: Failure of the plastic parts in the cooling system
  2. Medium severity: DISA intake manifold valve with play and noise
  3. Low severity: Oil leaks from gaskets (rocker cover, front cover and crankcase breather)
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
  • M43B16, 1.6 litre (102 hp; 1993-1999)[4][5][6]
  • M43B18, 1.8 litre (115 hp; 1993-1999)[4][12]
  • M43TUB19, 1.9 litre (105 hp; 1998-2002)[4][6][13]
  • M43TUB19, 1.9 litre (118 hp; 1998-2002)[4][6][13]
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 21 models with the BMW B48 / B38

M43 1.6, 1.8 and 1.9

Other comparisons

With the BMW B48 / B38

With the M43 1.6, 1.8 and 1.9

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. BMW M43B18 1.8L 115hp inline-4 cylinder engineAutoHints · Technical documentation · consulted 2 November 2026
  5. Der BMW M43 Motor: Technische Daten, Probleme, Haltbarkeit & FahrzeuglisteCarWiki.de · Other source · consulted 2 November 2026 · in German
  6. BMW M43: problemas conocidosEnginescope · Other source · consulted 2 November 2026
  7. BMW B38Wikipedia (inglés) · Other source · consulted 27 September 2026
  8. BMW B48Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  9. BMW M43Wikipedia (inglés) · Other source · consulted 2 November 2026
  10. BMW M43Wikipedia (alemán) · Other source · consulted 2 November 2026 · in German
  11. 5 BMWs That Prove the B48 Four-Cylinder Engine Is Better Than You ThinkBMWBLOG · Other source · published April 2026 · consulted 27 September 2026
  12. BMW 3 Series E36 Reliability Guide: Everything You Need to Know Before BuyingEuro Premium Parts · Technical documentation · consulted 2 November 2026
  13. 316i M43: 17 Jahre, Standhaftigkeit erhöhen (E46)BMW-Syndikat (foro) · Owners' forum · consulted 2 November 2026 · in German