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BMW B48 / B38 vs 1.8 and 2.0 Zetec-E: which engine is more reliable?

According to our risk index, the BMW B48 / B38 carries less risk than the 1.8 and 2.0 Zetec-E: 24/100 (low risk) versus 30/100 (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 1.8 and 2.0 Zetec-E has no documented serious faults.

Risk index

BMW B48 / B38

24

Low risk · 1 serious fault

Lower risk

Risk index

1.8 and 2.0 Zetec-E

30

Moderate risk · 0 serious faults

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 1.8 and 2.0 Zetec-E reliable?

The 1.8 and 2.0 litre Zetec-E engines in the Focus I are simple naturally aspirated petrol engines that, according to the sources, have no recurring serious fault. The most frequently mentioned issue is the plastic thermostat housing, which deforms and leaks coolant; in addition, Ford issued a recall in 2000 to replace the oil filler cap on 1.8 and 2.0 units built up to December 1999.[4][5][6]

See the 3 of the 1.8 and 2.0 Zetec-E faults

Side-by-side comparison

Comparison of BMW B48 / B38 and 1.8 and 2.0 Zetec-E
BMW B48 / B381.8 and 2.0 Zetec-E
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,998 cm³—
TimingChainTiming belt (dry)
Power136–312 hp115–130 hp
Productionsince 2014[1][7][8]1991–2004[4][9][10]
Reliability
Risk index (what is it?)24Low risk30Moderate risk
Documented faults43
Of high or critical severity10
Worst severityHigh severityMedium 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. Medium severity: Plastic thermostat housing: coolant leaks
  2. Medium severity: Loose oil filler cap and oil leak onto the exhaust
  3. Low severity: Dirty idle control valve: unstable idle
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
  • 1.8 Zetec-E 16v 115 hp (Focus I, 1998-2004)[4][5]
  • 2.0 Zetec-E 16v 130 hp (Focus I, 1998-2004)[4][5][12]
  • 1.6 Zetec-E 16v 90 and 95 hp (Mondeo II, 1996-2000)[9][13]
  • 1.8 Zetec-E 16v 115 hp (Mondeo II, 1996-2000)[13]
  • 2.0 Zetec-E 16v 131 hp (Mondeo II, 1996-2000)[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

1.8 and 2.0 Zetec-E

Other comparisons

With the BMW B48 / B38

With the 1.8 and 2.0 Zetec-E

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. Ford Focus MK1 – Typische Probleme & SchwachstellenGebrauchtwagenberater.de · Motoring press · published 5 October 2023 · consulted 2 November 2026 · in German
  5. Fiabilité et pannes du Ford Focus 1 (1998-2004)fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French
  6. Ford Focus recall R/2000/003: oil filler cap may become looseAutoinsider (datos DVSA) · Other source · published 20 March 2000 · 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. Ford Zeta engineWikipedia (inglés) · Other source · consulted 2 November 2026
  10. Ford FocusWikipedia (español) · Other source · consulted 2 November 2026 · in Spanish
  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. Ford Focus [MK1] [C170] (2002 - 2005) used car model guideExchange & Mart · Motoring press · consulted 2 November 2026
  13. Ford Mondeo 1993-2001: fiabilité et pannes (témoignages)fiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French