P0672 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Safe to drive (short-term)
P0672 on a BMW is a diesel-only code meaning the engine control unit detected an electrical fault in the glow plug circuit for cylinder 2. Glow plugs preheat each combustion chamber so a cold diesel can ignite. The code identifies the cylinder 2 circuit specifically, usually pointing to a failed plug, its wiring, or its connection rather than the whole system. Repairs typically run 30-180 EUR for a single plug and circuit fix.
- Severity
- Moderate · Electrical
- Typical repair cost, all makes
- €5-€420
Connect a standard OBD2 adapter (Bluetooth LE on iPhone) to your BMW and Skanyx tells you what P0672 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
Get Skanyx freeWhat does P0672 mean on a BMW?
The Quick Answer above is the generic definition. What follows is the model-specific detail for the BMW models that log P0672.
BMW 320d
2005-2019
On the 320d the cylinder 2 plug is monitored by the glow plug control module and reported to the DDE controller. Access on the N47 is tight and plugs seize easily, raising labor. Per-cylinder plug status on BMW is Mode $22 extended data needing a tool such as Carly; generic OBD2 shows only the P0672 circuit code, so bench-test the plug to confirm.
What causes P0672 on a BMW?
Beyond the generic causes listed on the main P0672 page, these are the patterns noted for BMW models:
Failed cylinder 2 plug on M47/N47/B47 engines
: BMW 320d
Seized plug increasing labor on tight N47 head access
: BMW 320d
How to diagnose P0672 on a BMW with OBD2
- Read the stored code and freeze frame with Skanyx or any ELM327 adapter to confirm P0672 and note the start temperature when it set
- Locate the cylinder 2 glow plug and inspect its connector and wiring for corrosion, looseness, or damage
- Disconnect the cylinder 2 glow plug and bench-test it with a multimeter: a healthy plug reads roughly 0.5-2 ohm, while an open (infinite) reading confirms that plug has failed
- If the cylinder 2 plug is good, check continuity of its wiring back to the control module and verify a clean ground
- Remember that per-cylinder glow plug live status is manufacturer-extended (Mode $22) data, not generic OBD2, so the multimeter test on the cylinder 2 plug is how you confirm the failure
- Consider replacing the full set if the plugs are original and high-mileage, since the others are likely to fail soon
How much does P0672 cost to fix on a BMW? (EUR)
Estimated repair costs for P0672 in EUR, compiled across makes. Expect BMW parts and labour towards the upper end of each range.
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Replace cylinder 2 glow plug (DIY) | €10–€30 | €0–€0 | €10–€30 | Moderate |
| Repair cylinder 2 connector/wiring (DIY) | €5–€25 | €0–€0 | €5–€25 | Moderate |
| Replace cylinder 2 glow plug (shop) | €10–€30 | €40–€120 | €50–€150 | Moderate |
| Replace full glow plug set as preventive (shop) | €60–€200 | €90–€220 | €150–€420 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
Codes related to P0672
These codes are often seen alongside P0672 or point to related issues, on any make:
Looking for the full P0672 reference (all makes, full diagnosis flow, complete repair cost matrix)? See the main P0672 guide