M47 Reliability & Problems

BMW M47

M47 Engine

The M47 is a diesel engine manufactured by BMW. It has a displacement of 2.0 liters and was produced from 1998 to 2007.

Typical Use Cases

BMW 3 Series (E46): 1998–2005
BMW 5 Series (E39): 1998–2003
BMW 1 Series (E87): 2004–2007
BMW X3 (E83): 2003–2006
BMW 3 Series (E90): 2005–2007

This overview summarizes the reliability of the BMW M47, including common issues and cost drivers.

Reliability Analysis

The engine shows moderate reliability with a risk score of 6.5 out of 10. This points to a higher likelihood of age-related problems, especially intake-related failures. The known issue is high severity, so preventive maintenance is key to keeping long-term ownership costs under control.

Caution

Autoscore Verdict

Caution. The risk score of 6.5 reflects age-related risks, especially swirl flap failure.

Risk Score

6.5

out of 10

Common Problems & Weak Points

Issue	Typical Mileage	Repair Cost (Est.)	Severity
Swirl Flap Failure	~150,000 km	€800 – €1800	High

Swirl Flap Failure

The M47 uses intake swirl flaps that can break as mileage increases. If a flap detaches and is ingested, it can cause major engine damage. This is a medium-probability issue that tends to appear around 150,000 km. Preventive removal or replacement reduces the risk. Repairs range from 800 to 1,800 EUR depending on the damage and parts replaced.

Typical Mileage: 150,000 km

Cost: €800–1800

Buyer's Inspection Checklist

Ask if the swirl flaps have been removed or upgraded, as this is a common preventive fix.
Listen for uneven idle or reduced power, which can indicate intake or turbo-related issues.
Check for smoke under load, which can hint at boost leaks or clogged intake components.
Review service history for regular oil changes, which are critical on older diesels.

Frequently Asked Questions

Is the M47 engine reliable?

The M47 has known weak points, but with good maintenance the reliability is solid. See the risk analysis and common problems for specifics. Start a report for a specific car.

How expensive are typical repairs?

Common repairs fall into a mid-range cost band depending on the issue and workshop. Check the cost ranges in the table. Use the used car report for specific listings.

Which model years are best for this engine?

Newer production years often include technical updates. Review the production years and revisions in the specs. Use Car Check for quick screening.