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.
"The diesel particulate filter (DPF) on bank 1 isn't doing its job of trapping soot, going by the pressure sensor across it. This is the opposite of a blocked filter. The ECU sees too little pressure difference between the front and back of the DPF, which usually means exhaust is getting past the filter instead of through it. Start with the cheap end: the small pipes that run from the DPF to the pressure sensor can split, come off or block, and the sensor itself can fail. If those are sound, the filter may be cracked or damaged inside, which means a new DPF. On a car that's been modified, a missing or hollowed-out filter sets this code too."
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:
The diesel particulate filter (DPF) on bank 1 isn't doing its job of trapping soot, going by the pressure sensor across it. This is the opposite of a blocked filter. The ECU sees too little pressure difference between the front and back of the DPF, which usually means exhaust is getting past the filter instead of through it. Start with the cheap end: the small pipes that run from the DPF to the pressure sensor can split, come off or block, and the sensor itself can fail. If those are sound, the filter may be cracked or damaged inside, which means a new DPF. On a car that's been modified, a missing or hollowed-out filter sets this code too.
Yes, it's safe to drive. Some cars cut power with this fault. If yours does, stay off fast roads and get it checked. If it drives normally, get it booked in soon rather than leaving it. A damaged filter lets soot out, and the fault won't fix itself.
No, it's close to the opposite. A blocked DPF usually shows as soot or restriction codes like P2463 or P246C. P2002 says the filter isn't holding back enough, so the hunt is for a leak, a bad sensor reading or a damaged filter, not a clog.
A split sensor pipe can be a few pounds. A new pressure sensor is often somewhere around £20 to £80 for a branded part, depending on the car. A new DPF is the big one. It can be several hundred pounds fitted with an aftermarket unit, and well over £1,000 on some cars with a genuine part. That's why the pipes and sensor come first.
No. Removing a DPF from a car that came with one is illegal for road use in the UK. A missing DPF, or signs one has been tampered with, is also a major fault in the MOT rules. Fix or replace it properly.
We won't guess at an MOT result from a code. Here are the facts. On a diesel first used from July 2008, an engine warning light that stays on is a major fault in the MOT rules. The tester also checks the DPF hasn't been removed or tampered with. On a car with a DPF, any visible smoke from the exhaust during the smoke test is a major fault too.
Free app. Plug in, and get every code in plain English, plus the connections you'd never spot.