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.
"Your EVAP system, the sealed plumbing that holds petrol vapour from the tank, has found a very small leak. Smaller than P0442. Think pinhole, not drip. It's one of the least worrying codes there is, but also one of the fiddliest to find. Start with the fuel cap seal. After that it's usually a perished hose, a purge or vent valve that doesn't seal fully, or the filler neck. Not every car checks for leaks this small. Many European-market cars don't run a leak test at all, so you'll see it more on some makes than others. Petrol cars only."
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:
Illustrative panels. These readings aren’t in our free demo drive, but the app shows them live from your own car.
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:
Your EVAP system, the sealed plumbing that holds petrol vapour from the tank, has found a very small leak. Smaller than P0442. Think pinhole, not drip. It's one of the least worrying codes there is, but also one of the fiddliest to find. Start with the fuel cap seal. After that it's usually a perished hose, a purge or vent valve that doesn't seal fully, or the filler neck. Not every car checks for leaks this small. Many European-market cars don't run a leak test at all, so you'll see it more on some makes than others. Petrol cars only.
Yes, it's safe to drive. A leak this small doesn't change how the car drives. Check the fuel cap is on tight. If you smell fuel, get it checked straight away.
The car has to rerun its leak test before it's satisfied, and that test only runs under certain conditions. On many cars that means after the car has sat for a while, often overnight, with the fuel level in a middle band. It can take several days of normal driving. If the code comes back, the cap wasn't the cause.
A cap is cheap. A hose or valve is usually modest. Finding a leak this small is the real cost, and a smoke test is the honest way to do it.
We can't tell you how an MOT will go. That depends on far more than one code. The fact is that a lit engine management light is an MOT failure item in the UK. Fix it, then drive a few days to make sure the light stays off.
Free app. Plug in, and get every code in plain English, plus the connections you'd never spot.