P0673 — Problem with cylinder 3 glow plug electrical circuit
The engine control unit detected an issue with the electrical circuit for the glow plug in cylinder 3. Glow plugs help start diesel engines by heating the combustion chamber. This code appears when the glow plug is not working properly or there is a wiring or connection fault.
Common causes
The cause is almost always one of a few things. Here they are — P0673 rarely comes from anything outside this list:
- Faulty glow plug in cylinder 3
- Damaged or corroded wiring/connectors to glow plug
- Blown fuse or relay for glow plug circuit
- Faulty glow plug control module or ECU issue
Where to start
In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:
- Check and replace blown fuses or relays
- Inspect and repair wiring and connectors to glow plug
- Test and replace faulty glow plug in cylinder 3
- Check glow plug control module or ECU if problem persists
That is what holds for P0673 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
Why TorqFix for your car?
Above is what the code means and why it appears. TorqFix goes further — it gives you specific procedures, torque values, wiring diagrams and pinouts for your exact engine, not generic steps for every car. Real workshop data (127,000+ diagrams, 10,000+ procedures), interpreted by AI in your language.
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Code breakdown
🔧 Related repair procedures
- AUDI: Removing and installing ignition coils with output stages, cylinder bank 1 (right-side)
- AUDI: Removing and installing ignition coils N70/N127/N291/N292 (cylinder bank 1 right-side)
- AUDI: Removing and installing ignition coils with output stage
- VW: Removing and installing ignition coils with output stages
- AUDI: Testing ignition coils -N, -N128 and -N158 with output stage -N122
- AUDI: Testing ignition coils
- AUDI: Checking ignition coils
- AUDI: Testing twin-spark ignition system with two ignition coils
- AUDI: Testing ignition coils with output stages
- VW: Checking ignition coils with final output stage
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
The same code can mean different things on different makes. Match the meaning to your make before acting on it.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
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