Pick a colour. The page changes, like the app does.
Officially? A wall of jargon. To most people? Absolutely nothing. That's exactly why we built the app.
Plug into any code reader and you'll get the same line every other app shows you. Technically correct. Practically useless.
"There's a fault in a glow plug circuit. Glow plugs heat the combustion chambers so a diesel starts easily from cold, and on many modern diesels they stay on for a while after starting to smooth the running and cut smoke. With a fault here you might notice longer cranking on cold mornings, a rough first few seconds or white smoke at start-up. In mild weather you may notice nothing. Usually a glow plug has failed, or there's a wiring or connector fault. The glow plug relay or control module is the next suspect. Each plug can be tested with a multimeter."
Worth checking in roughly this order. Don't jump straight to the expensive fix:
The code itself is a snapshot. The fault sets after the car's watched the numbers over a whole drive cycle. Here's what's worth keeping an eye on:
Live simulation on the readings our free demo drive supports. This is how the app’s dials move.
Codes rarely tell the whole story. The clever part is reading them together, and against your exact car. Here's the kind of thing it catches:
There's a fault in a glow plug circuit. Glow plugs heat the combustion chambers so a diesel starts easily from cold, and on many modern diesels they stay on for a while after starting to smooth the running and cut smoke. With a fault here you might notice longer cranking on cold mornings, a rough first few seconds or white smoke at start-up. In mild weather you may notice nothing. Usually a glow plug has failed, or there's a wiring or connector fault. The glow plug relay or control module is the next suspect. Each plug can be tested with a multimeter.
Yes, it's safe to drive. It may be hard to start in the cold, so get it looked at soon. Once the engine's warm, glow plugs have little to do with how it drives.
Many people do if the plugs are old, since the others are likely to follow and the labour is similar. If the plugs were changed recently, replacing only the failed one is reasonable.
Glow plugs are often in the region of £10 to £30 each. A garage changing a full set commonly charges a couple of hundred pounds if they come out cleanly. The cost jumps if one snaps in the head, which is why care on removal matters. A relay or control module is a mid-priced part.
With glow plugs not working, the cylinders are cold and the fuel doesn't light as easily, so the engine cranks longer and may shake or smoke for a few seconds. A weak battery makes it worse. Both are worth checking going into winter.
Free app. Plug in, and get every code in plain English, plus the connections you'd never spot.