BMW M47 vs 1.4 TDI: which engine is more reliable?

According to our risk index, the 1.4 TDI carries less risk than the BMW M47: 38/100 (moderate risk) versus 79/100 (very high risk). The BMW M47 has 3 documented serious faults, the main one being «Intake swirl flap breakage (swirl flaps)»; the 1.4 TDI has 2 documented serious faults, the main one being «Timing belt and water pump».

Risk index

BMW M47

Very high risk · 3 serious faults

Risk index

1.4 TDI

Moderate risk · 2 serious faults

Lower risk

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

Reviewed on 27 September 202615 sources How we work

Is the BMW M47 reliable?

The BMW M47 (1998-2007, a 4-cylinder diesel fitted to the 3 Series E46/E90, 1 Series E87, 5 Series E60, X3 E83, the Rover 75 and the Land Rover Freelander) is solid in its basic mechanicals, but the common rail versions, built since 2001, carry a serious and well-documented problem: the intake manifold swirl flaps can break and enter the cylinder, with a risk of engine damage. The turbo and injectors also account for known faults.^[1][2][3][4]

See the 6 of the BMW M47 faults

Is the 1.4 TDI reliable?

It depends on the generation. The unit-injector one (1999-2010) calls for watching the timing belt - which also drives the unit injector pumps - the water pump, the turbo and the EGR, with a DPF only on the last BlueMotion/Ecomotive versions. The later EA288 (2014-2019) is not singled out by dieselgate, which according to the sources consulted was limited to the EA189, but it shares the need to watch the belt, turbo, EGR and DPF.^[5][6][7]

See the 4 of the 1.4 TDI faults

Side-by-side comparison

Comparison of BMW M47 and 1.4 TDI
Item	BMW M47	1.4 TDI
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	1,995 cm³	1,422 cm³
Timing	Chain	Timing belt (dry)
Power	116–163 hp	69–90 hp
Production	1998–2007^[1][2][8][9]	1999–2019^[6][7]
Reliability
Risk index (what is it?)	79Very high risk	38Moderate risk
Documented faults	6	4
Of high or critical severity	3	2
Worst severity	Critical severity	High severity
Main faults	Critical severity: Intake swirl flap breakage (swirl flaps) High severity: Loss of power and turbo faults Medium severity: Blocked and seized injectors	High severity: Timing belt and water pump High severity: Failing turbo: loss of power, whistling or smoke Medium severity: Clogged particulate filter (DPF)
Most expensive documented repair	up to €300Faulty air flow meter on the BMW M47 (loss of power)Published figure^[10]	up to €2,000Clogged particulate filter (DPF)Published figure^[11]
Which versions to buy
BuyRecommended versions	M47D20 116-136 hp (1998-2001)^[1][3]	1.4 TDI common rail EA288 (2014-2019)^[5][6]
With cautionVersions to be cautious about	M47D20TU 116-150 hp (2001-2004)^[1][3][4] M47D20TU2 122-163 hp (2004-2007)^[1] M47R 116-131 hp (Rover 75, MG ZT and Land Rover Freelander, 1998-2006)^[1][12]	1.4 TDI unit injector, 3 cylinders (1999-2010)^[13][14][15]
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

BMW M47

See the 8 models with the BMW M47

1.4 TDI

See the 10 models with the 1.4 TDI

Other comparisons

With the BMW M47

With the 1.4 TDI

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Sources

Every fact on this page links to its source. If you find an error, let us know.

BMW M47Wikipedia (inglés) · Other source · consulted 27 September 2026
BMW M47D20 engine specifications, problems and reliabilityBimmerPulse · Technical documentation · consulted 27 September 2026
Motor BMW M47: problemas y averíasDasercars · Technical documentation · consulted 27 September 2026 · in Spanish
BMW 3er E46: typische Probleme und SchwachstellenGebrauchtwagenberater · Technical documentation · consulted 27 September 2026 · in German
Escándalo de emisiones contaminantes de vehículos VolkswagenWikipedia (español) · Other source · consulted 27 September 2026 · in Spanish
VW EA288Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
List of discontinued Volkswagen Group diesel enginesWikipedia (inglés) · Other source · consulted 27 September 2026
BMW M47Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
BMW 3 Series (E46)Wikipedia (inglés) · Other source · consulted 27 September 2026
Caudalímetro o sensor MAF: qué es, cómo funciona y cuáles son las averías más frecuentesDiariomotor · Motoring press · consulted 30 October 2026 · in Spanish
Cuánto cuesta sustituir el filtro de partículas de un coche diéselDiariomotor · Motoring press · consulted 27 September 2026 · in Spanish
Rover 75Wikipedia (inglés) · Other source · consulted 27 September 2026
Bomba de agua del coche: la avería de más de 1.500 euros que arrastra la correa de distribuciónMotor16 · Motoring press · published 21 September 2026 · consulted 27 September 2026 · in Spanish
Cuánto cuesta válvula EGRDiariomotor · Motoring press · consulted 27 September 2026 · in Spanish
Cómo saber si el turbo está roto o a punto de romperseMotor.es · Motoring press · consulted 27 September 2026 · in Spanish