What Are Common BMW B57 Engine Problems?

The BMW B57 engine, first released in 2015, is a well-known 3.0-litre straight-six turbo-diesel that’s found in a wide range of BMWs. You’ll see it in models like the 5 Series (G30/G31), 7 Series (G11/G12), and X5 (G05), as well as newer SUVs like the X6 (G06) and X7 (G07). One of the most common versions, the B57D30A, is popular for good reason—it offers strong performance, a smooth driving experience, and solid fuel efficiency.

However, even significant engines have their flaws. Being aware of the common issues with the B57 can help you catch problems early and keep your BMW running at its best.

Common Issues with the BMW B57 Engine

1. EGR Cooler Leaks (Exhaust Gas Recirculation)

One of the most prevalent problems with the B57 engine is a faulty exhaust gas recirculation (EGR) cooler leak. As it begins to malfunction, the coolant can seep into the intake system, causing white exhaust smoke, rough idling, or in the worst-case scenario, serious engine damage. The problem became so prevalent that BMW had to recall certain models produced from the years 2016 to 2018.

Some drivers detected the smell of burning or even steam rising from under the bonnet, particularly in vehicle models such as the 5 Series (G30), the X3 (G01), or the X5 (G05). No wonder it is critical to have an EGR cooler inspected regularly. Early identification can spare you from far larger (and costly) complications in the long run. There’s also the option to delete it too.

2. Carbon Build-Up in the Intake System

If you're doing the majority of your driving in short distances or sitting in stop-and-go traffic, then you're going to experience this problem more frequently. The intake valves and manifold can clog with carbon buildup from oil vapour and soot if the engine is not reaching the temperature it needs to in order to burn it away.

You may observe your vehicle becoming less responsive, getting poorer fuel efficiency, or failing to accelerate as quickly as it has in the past. Maintenance, as well as the periodic long journey, can keep such an issue in balance.

3. Timing Chain Stretch

While the BMW B57 engine is more reliable than earlier diesel engines like the N47 (infamous for timing chain failures), it’s not entirely immune. In high-mileage or poorly serviced engines, timing chain stretch can still occur, causing a rattling noise during cold starts.

This is more likely to happen in older high-mileage X5 (F15/F85) or 7 Series (F01/G11) models. Replacing a stretched timing chain is costly, so it’s better to prevent it with regular oil changes using the correct spec oil.

4. DPF (Diesel Particulate Filter) Blockages

If you drive a modern diesel BMW with the B57D30 engine—especially around town or on short trips—you might run into DPF issues. The Diesel Particulate Filter is designed to reduce emissions. Still, it requires high engine temperatures for extended periods (such as during motorway drives) to clean itself through a process called regeneration. Without that, it can clog up, trigger warning lights, and even push your car into limp mode.

5. Sensor Failures

Since the B57 engine is subject to stringent emissions regulations, it utilizes various sensors to monitor its performance. Over time, sensors such as the NOx sensor or the boost pressure sensor may become worn or malfunction. This may trigger warning lights, disrupt the vehicle’s performance, and even result in an MOT failure.

We frequently have clients inquire about replacement parts, particularly sensors such as the NOx or MAP sensor, for mass models like the F20 1 Series or the G30 5 Series.

Conclusion

The B57 is an excellent, durable engine found in several BMW models; even the best engines require periodic maintenance, as well as high-quality replacement parts. If you’re replacing a broken EGR cooler, searching for an entire engine or just need some spares, it is critical to select the right pieces.

We specialize in used, inspected, and OEM BMW engines and parts from 2012 and later model years. Being family-owned, we are dedicated to ensuring that every part we ship is ready to install. We provide all BMW engines with a warranty and quick shipment so that you can get back in the driver's seat, stress-free. If you need BMW engine for sale​, check out our inventory at mtautoparts.com

FAQs

1. Can I fit a B57 engine from an X5 into my 5 Series?

Technically, yes, provided the engine codes match and the cars belong to the same generation. For instance, one can install a b57d30A engine from a G05 X5 into a G30 5 Series, but differences in the ECU setup, the turbo spec, or the pairing with the transmission might necessitate adaptation.

2. How do I know if my DPF is blocked?

Common symptoms include lower engine power, higher fuel consumption, dashboard warning lights, or even a “limp mode” display. It can occur sooner if you frequently engage in stop-and-start city driving. The B57 requires higher-mileage driving to regenerate.

3. What’s the warranty if I buy a used B57 engine?

We provide a 30-day guarantee with the majority of parts we sell, such as full BMW engines for sale, under our terms and conditions. This guarantees against faults which have not resulted from misuse or incorrect fitting. You can see full warranty details here.