BMW B57 vs 1.4 HDi: which engine is more reliable?

According to our risk index, the BMW B57 carries less risk than the 1.4 HDi: 22/100 (low risk) versus 43/100 (moderate risk). The BMW B57 has 3 documented serious faults, the main one being «EGR cooler leaks on the B57 (limited action on the 540d xDrive)»; the 1.4 HDi has 1 documented serious fault, the main one being «Timing belt and water pump».

Risk index

BMW B57

Low risk · 3 serious faults

Lower risk

Risk index

1.4 HDi

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

Reviewed on 4 October 202610 sources How we work

Is the BMW B57 reliable?

The BMW B57 (2015 onwards) is the six-cylinder diesel that succeeded the N57. The sources consulted document no widespread faults: its most cited weak point is the AdBlue/SCR system, and it was left out of the big EGR campaigns that hit the N47 and N57. The timing chain is still at the back, next to the gearbox.^[1][2]

See the 4 of the BMW B57 faults

Is the 1.4 HDi reliable?

It is a small diesel that is generally reliable, but with a very well-documented weakness: the injectors tend to lose their seal over time and let diesel escape. The turbo and the EGR valve also fail on a noticeable minority of units, and there are isolated cases of the crankshaft damper pulley failing at very high mileages. The timing belt does not seem to cause more problems than on any diesel of its era if it is changed on time.^[3][4][5]

See the 5 of the 1.4 HDi faults

Side-by-side comparison

Comparison of BMW B57 and 1.4 HDi
Item	BMW B57	1.4 HDi
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,993 cm³	1,399 cm³
Timing	Chain	Timing belt (dry)
Power	265–400 hp	54–92 hp
Production	since 2015^[6][7]	2001–2010^{[3][8][9][10]}
Reliability
Risk index (what is it?)	22Low risk	43Moderate risk
Documented faults	4	5
Of high or critical severity	3	1
Worst severity	High severity	High severity
Main faults	Medium severity: AdBlue/SCR system fault (NOx sensors, heater and pump) High severity: EGR cooler leaks on the B57 (limited action on the 540d xDrive) High severity: Timing chain wear on the gearbox side	Medium severity: Injectors that lose their seal and let diesel escape High severity: Timing belt and water pump Medium severity: Premature turbo wear from poor lubrication
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	B57D30 265 hp, single turbo (B57D30O0, 2015-2020)^[1] B57D30 286-340 hp, twin turbo with 48 V (B57D30O2/T2, 2020 onwards)^[1]	None
With cautionVersions to be cautious about	B57D30 320 hp, twin turbo (B57D30T0, 2015-2020)^[1] B57D30 400 hp, four turbos (B57D30S0, 2016-2020)^[1]	1.4 HDi/TDCi 54/68/70 8V (DV4TD, 2001-2009)^[4][5] 1.4 HDi 90/92 16V (DV4TED4, 2002-2009)^[4][10]
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 B57

See the 8 models with the BMW B57

1.4 HDi

See the 12 models with the 1.4 HDi

Other comparisons

With the BMW B57

With the 1.4 HDi

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Sources

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

Motor BMW B57: fiabilidad y averíasDasercars · Motoring press · consulted 4 October 2026 · in Spanish
Motor BMW N57: diferencias con el B57Dasercars · Motoring press · consulted 4 October 2026 · in Spanish
Motor PSA DVWikipedia (es) · Other source · consulted 27 September 2026 · in Spanish
Essai, avis et fiabilité des 1.4 HDI 68 chFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
Essai, avis et fiabilité des 1.4 HDI 70 chFiches-Auto.fr · Motoring press · consulted 27 September 2026 · in French
BMW B57 (Wikipedia en)Wikipedia · Other source · consulted 4 October 2026
BMW B57 (Wikipedia de)Wikipedia · Other source · consulted 4 October 2026 · in German
Ford Duratorq engineWikipedia (en) · Other source · consulted 27 September 2026
Peugeot DV4TD engine: specifications and applicationsMyMotorList · Technical documentation · consulted 27 September 2026
Peugeot DV4TED4 engine: specifications and applicationsMyMotorList · Technical documentation · consulted 27 September 2026