Purge valve wiring open.
P0444 — also written PO444, P 0444, 0444 — is the OBD-II code for evap purge control valve open circuit. Same code, same fix: this page covers every spelling of it.
P0444 means the engine's brain has lost touch with the purge valve because the electrical circuit is broken. It’s a classic headache on Vauxhall Astras and older VW Polos where the wiring gets brittle.
P0444 is a emissions fault code, typically costing £45–£250 to put right in a UK garage.
What P0444 actually feels like to drive
- The 'Check Engine' light is staring you in the face, but the car drives mostly fine.
- You might notice a slightly lumpy or 'hunting' idle when sitting at the lights in town.
- A faint smell of petrol vapours around the front wheel arch after a long run.
- Slightly worse fuel economy—nothing drastic, but you'll lose a few MPG on the commute.
- It’ll fail the MOT on the MIL light alone, even if the emissions are actually okay.
What causes P0444?
- Broken wire
- Failed valve
UK vehicles that throw P0444 most often
- Vauxhall Corsa D/E 1.2 & 1.4 (A12XER/A14XER) 2006-2019
- Vauxhall Astra J 1.4 Turbo (A14NET) 2009-2015
- Volkswagen Polo 1.2 & 1.4 (AZQ/BBY) 2002-2009
- BMW 3 Series (E90/E92) 320i/325i (N43/N53) 2007-2013
- Ford Fiesta 1.25 Zetec 2008-2017
- MINI Cooper (R56) 1.6 N12 2006-2013
How P0444 is fixed
- Replace purge valve
- Repair wiring
The P0444 misdiagnosis that wastes money
I see lads jumping straight to the charcoal canister or oxygen sensors because the 'Check Engine' light is on, but you're wasting your time there. On the Corsa D or the Astra, I've seen plenty of people waste sixty quid on a cheap eBay purge valve only for the light to stay on. The real culprit is usually the tiny, brittle wiring loom that runs across the top of the engine—it rubs against the plastic intake or the fuel rail until the wire snaps inside the insulation. It looks fine, but there's zero continuity.
What a UK garage should charge for P0444
You're looking at a £50 to £70 diagnostic fee just to get the scanner on it and check the live data. If it’s just the valve, a Bosch unit is usually £40 to £80 plus half an hour of labour. If the wiring is snapped near the plug, I’d charge about £120 total for the repair and clear-down. Main dealers like Arnold Clark or Evans Halshaw will easily double that, probably quoting you £250 plus VAT once they've added their 'environmental' charges.
P0444 repair cost in the UK
Most P0444 repairs land between £45–£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 P0444
Don't let a garage talk you into a 'smoke test' for this code; that's for leaks, not open circuits. If your P0444 is back, insist they do a 'pin-out' test with a multimeter at the valve connector. If there's no 12V feed with the ignition on, it's a wiring break, not a dead valve. Also, if you’re buying the part yourself, stick to Bosch or Pierburg. The unbranded ones from the local factors are rubbish and usually trigger a 'low flow' code two weeks later.
Can you drive with P0444?
Yes.
Urgency: low.