Glow plug 2 electrical fault.
P0672 — also written PO672, P 0672, 0672 — is the OBD-II code for glow plug 2 circuit. Same code, same fix: this page covers every spelling of it.
P0672 means the heater plug in cylinder number two has given up the ghost or the wiring to it has frayed. It’s a classic winter headache, especially on VAG and Ford diesel lumps.
P0672 is a electrical fault code, typically costing £30–£250 to put right in a UK garage.
What P0672 actually feels like to drive
- Lumpy idle for the first 30 seconds on a cold morning.
- Excessive grey or white smoke from the tailpipe immediately after starting.
- The 'Service Vehicle Soon' message on Vauxhall dashboards.
- A slight 'chug' or hesitation when pulling away before the engine is up to temp.
- Regeneration issues with the DPF because the ECU won't trigger a burn with glow plug faults.
What causes P0672?
- Failed glow plug
- Wiring fault
UK vehicles that throw P0672 most often
- Vauxhall Insignia 2.0 CDTi (A20DTH) 2008-2015
- Volkswagen Golf Mk6/Mk7 2.0 TDI (CFGB/CRBC) 2009-2017
- Ford Focus 1.6 TDCi (DV6) 2011-2015
- BMW 3 Series 320d (N47) 2007-2013
- Audi A3 1.9/2.0 TDI 2004-2013
How P0672 is fixed
- Replace glow plug
The P0672 misdiagnosis that wastes money
I've lost count of how many times I've seen customers come in having already swapped the Glow Plug Control Module because 'all the plugs looked okay' on a basic multimeter test. In the real world, these plugs often fail under load or have high internal resistance that a cheap DIY meter won't catch. On the Vauxhall A20DTH engines, people often blame the battery or the starter motor first because the car struggles to fire on a frosty morning, when it's actually just cylinder 2 not pulling its weight.
What a UK garage should charge for P0672
You're looking at £50 to £80 for a diagnostic scan to confirm it’s the plug and not the loom. A decent Bosch or NGK glow plug will cost you £15 to £25 from a factor like Euro Car Parts or GSF. Labour is the wild card; if it comes out easy, it's a 45-minute job (£60-£90). If it's seized, prices spiral. A main dealer will easily double these rates, often charging £150+ just for the diagnosis and 'health check'.
P0672 repair cost in the UK
Most P0672 repairs land between £30–£250 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Bob's tip on P0672
If you're taking it to a garage, ask them point-blank if they use an induction heater or a vibrating torque wrench for removal. If they just say 'we'll give it a go with a breaker bar,' walk away. On modern diesels like the 1.6 TDCi, these plugs are thin and snap for fun. I always tell my customers: if it snaps, the head has to come off, and a £100 job becomes a £1,500 nightmare. Insist they use a penetrating oil like PlusGas a few days before the appointment. It makes a world of difference.
Can you drive with P0672?
Yes.
Urgency: low.