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B57D30O2B57D30T2

B57D30 286-340 hp, twin turbo with 48 V (B57D30O2/T2, 2020 onwards) engine: faults and reliability

BMW B57 (B57D30) version

Buy

It is the most recent version and we have no specific faults documented; being the youngest, it also has the least history. A specialist garage treats it, with the second generation of the 48 V system, as the engine's most mature phase.[1]

Years
since 2020
Power
286–340 hp
Faults that affect it
3
2 of high or critical severity
Cars that use it
7
in our database

12 sourcesHow we work

What changes in this version

The 2020 revision: 330d with 286 hp (210 kW, 650 Nm) and 40d/M340d with 340 hp (250 kW, 700 Nm), with a 48 V system and an 8 kW starter-generator; according to German Wikipedia, solenoid injectors and steel pistons arrived in 2022.[2][3][4][5]

Engine codes of this version: B57D30O2, B57D30T2.

Faults of the B57D30O2 engine

The documented engine faults that affect this version and its years, from most to least important.

  1. 1Medium severityFrequency: OccasionalEmissions controlAdBlue/SCR system fault (NOx sensors, heater and pump)A specialist garage considers the B57's AdBlue/SCR system the fault that most often leaves cars immobilised: a NOx sensor, the quality sensor, the heater or the pump usually fails, and topping up the tank rarely stops the countdown of remaining starts.
  2. 2High severityFrequency: RareTimingTiming chain wear on the gearbox sideDasercars states that the B57 does not repeat the N47's premature chain wear, but that the chain is still on the gearbox side, so any work on it is expensive. A brief rattle when cold should be checked soon.
  3. 3High severityFrequency: RareTurboDegradation of the turbos on multi-turbo versionsOn the twin-turbo and four-turbo versions, a specialist garage considers oil in the intercooler or intake ducts the earliest warning of turbo degradation, before any fault codes appear.

Cars fitted with the B57D30O2 engine

Open each car to see all its faults with this engine and what to check before buying it.

BMW

Frequently asked questions

Is the B57D30O2 engine reliable?

Our verdict is “Buy”. It is the most recent version and we have no specific faults documented; being the youngest, it also has the least history. A specialist garage treats it, with the second generation of the 48 V system, as the engine's most mature phase.[1]

What faults does the B57D30O2 engine have?

The documented ones that affect this version, by importance: adBlue/SCR system fault (NOx sensors, heater and pump) (medium severity), timing chain wear on the gearbox side (high severity) and degradation of the turbos on multi-turbo versions (high severity).

Which cars use the B57D30O2 engine?

BMW Serie 3 G20 (since 2019), BMW Serie 5 G30 (2017–2023), BMW X3 G01 (2017–2024), BMW X4 G02 (2018–2024), BMW X5 G05 (since 2018), BMW X6 G06 (since 2019) and BMW X7 G07 (since 2018).[2][3][5][6][7][8][9][10][11][12]

Are you buying a car with the B57D30O2 engine?

We will put you in touch with a partner only if you authorise it in the form.

Do you have a car with this engine? Tell us which faults you have had and at how many kilometres. Report your fault.

Sources

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

  1. Motor BMW B57: fiabilidad y averíasDasercars · Motoring press · consulted 4 October 2026 · in Spanish
  2. BMW B57 (Wikipedia de)Wikipedia · Other source · consulted 4 October 2026 · in German
  3. BMW 3 Series (G20)Wikipedia · Other source · consulted 4 October 2026
  4. Todos los BMW Mild Hybrid 2020, con precios y datosAutopista · Motoring press · published April 2020 · consulted 4 October 2026 · in Spanish
  5. BMW X5 y X6 2020: nuevas versiones diésel microhíbridas de 48 VAutopista · Motoring press · published February 2020 · consulted 4 October 2026 · in Spanish
  6. BMW 5 Series (G30)Wikipedia · Other source · consulted 4 October 2026
  7. BMW X3 (G01)Wikipedia · Other source · consulted 4 October 2026
  8. BMW B57 (Wikipedia en)Wikipedia · Other source · consulted 4 October 2026
  9. BMW X4 (G02)Wikipedia · Other source · consulted 4 October 2026
  10. BMW X5 (G05)Wikipedia · Other source · consulted 4 October 2026
  11. BMW X6 (G06)Wikipedia · Other source · consulted 4 October 2026
  12. BMW X7Wikipedia · Other source · consulted 4 October 2026