Glow plugs BMW 3 Series E46 M47D20 (2.0d) — NGK, Bosch, Denso, Beru
Glow plugs for BMW 3 Series E46 M47D20 (2.0L diesel, 1998–2007) — NGK, Bosch, Denso, Beru and Delphi part numbers with replacement interval.
Technical Specifications
| Parameter | Value |
|---|---|
| Make / Model | BMW 3 Series E46 |
| Engine Code | M47D20 |
| Displacement | 2.0L |
| Production Years | 1998–2007 |
| Voltage | 11.5 V |
| Length | 100 mm |
| Thread | M8x1 |
| Heat-up time | 6 sec |
| Replacement interval | 80 000 km |
Compatible Glow Plugs
| Brand | Part Number |
|---|---|
| NGK | Y-124H |
| Bosch | 0 250 202 026 |
| Denso | DG-601 |
| Beru / BorgWarner | GN005 |
| Delphi | HDS150 |
Replacement Interval
Preventive replacement every 80 000 km or when cold-start problems appear.
Glow plugs are a wear item that many drivers change only when they fail. Preventive replacement is cheaper and more reliable than emergency replacement in winter.
Symptoms of Faulty Glow Plugs
- Hard cold starts, especially below –5°C
- White smoke from the exhaust during warm-up
- Pre-heat indicator stays on too long or flashes
- Rough running immediately after start
- Fault codes P0671–P0678 (glow plug circuit malfunction, cylinder N)
Replacement Tips
- Replace as a full set — all cylinders at once, otherwise the problem will return within months.
- Torque — for M8x1 thread: 10–15 Nm. Over-tightening causes the plug to snap.
- Anti-seize — apply copper grease to the thread before installation (keep the electrical contact free).
- Cold engine only — always remove glow plugs from a cold engine.
FAQ
Which glow plugs fit BMW 3 Series E46 M47D20?
NGK Y-124H, Bosch 0 250 202 026, Denso DG-601, Beru GN005. All are OE-approved for this engine.
How often should glow plugs be changed in a diesel BMW?
Preventively every 80 000 km, or at the first sign of poor cold starting. In practice most drivers replace them at 100,000–150,000 km.
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