Glow plugs Opel Insignia A A20DTH (2.0 CDTId) — NGK, Bosch, Denso, Beru
Glow plugs for Opel Insignia A A20DTH (2.0 CDTIL diesel, 2008–2017) — NGK, Bosch, Denso, Beru and Delphi part numbers with replacement interval.
Technical Specifications
| Parameter | Value |
|---|---|
| Make / Model | Opel Insignia A |
| Engine Code | A20DTH |
| Displacement | 2.0 CDTIL |
| Production Years | 2008–2017 |
| Voltage | 11.5 V |
| Length | 117.5 mm |
| Thread | M10x1.0 |
| Heat-up time | 5 sec |
| Replacement interval | 120 000 km |
Compatible Glow Plugs
| Brand | Part Number |
|---|---|
| NGK | NGK Y-548U |
| Bosch | Bosch 0250202135 |
| Denso | Denso DG-186 |
| Beru / BorgWarner | Beru GN875 |
| Delphi | Delphi HDS003 |
Replacement Interval
Preventive replacement every 120 000 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 M10x1.0 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 Opel Insignia A A20DTH?
NGK NGK Y-548U, Bosch Bosch 0250202135, Denso Denso DG-186, Beru Beru GN875. All are OE-approved for this engine.
How often should glow plugs be changed in a diesel Opel?
Preventively every 120 000 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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