Overview
This video provides a detailed overview of the common reliability issues found in the BMW B57 diesel engine, explains the causes, and offers practical maintenance advice to owners.
Common B57 Engine Issues
- Turbocharger wastegate actuators are prone to electronic failure and rattling, which can ultimately damage the turbo.
- High-pressure fuel pumps frequently fail due to poor design; replacement with an upgraded unit is advised.
- EGR coolers overheat and fail, especially for vehicles used mostly on short trips.
- Diesel Particulate Filters (DPF) commonly clog due to short journeys, insufficient regeneration, or faulty glow plugs.
- DPF pressure sensors indicate filter blockages, often requiring forced regeneration if not automatically triggered by normal driving.
- ZF 8-speed gearboxes may suffer from rough shifting and slipping if fluid and filter changes are neglected.
- Fuel filters clog easily on the B57, especially when running low-quality diesel or driving on reserve fuel.
- Oxygen and mass airflow (MAF) sensors are prone to failure, leading to poor engine performance and economy.
- A major recall exists for a fire risk related to a faulty coolant pump and engine management software, which BMW will repair for free.
Maintenance and Usage Recommendations
- Replace faulty turbo wastegate actuators promptly to avoid turbo damage.
- Address high-pressure fuel pump issues immediately to prevent further damage to injectors, DPF, EGR, and intake.
- Avoid frequent short journeys; take the car on long drives weekly to maintain EGR and DPF health.
- Ensure glow plugs are working to assist proper DPF regeneration.
- Regularly change the transmission fluid and filter, especially on higher mileage vehicles.
- Use high-quality diesel fuel and avoid running the tank to reserve to prevent fuel filter clogging.
- Use a scan tool to diagnose sensor-related check engine lights before replacing components.
- Follow up on recall status and have the coolant pump/engine management update completed if outstanding.
Decisions
- Recommend prompt replacement of faulty turbo wastegate actuators
- Advise use of upgraded high-pressure fuel pumps
- Encourage compliance with the coolant pump recall
Recommendations / Advice
- Perform regular long drives to aid DPF and EGR system maintenance.
- Avoid aggressive driving while the engine and transmission are cold.
- Maintain quality fuel and timely filter changes for optimal engine longevity.
- Use a diagnostic tool for accurate fault identification and repair.