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.
"Same story as P0171 but on the other bank. Bank 2 is running lean, too much air for the fuel. The important bit: if you've got this together with P0171 (they very often show up as a pair), that's your biggest clue. Both banks lean at once means one shared cause, not two separate faults: a vacuum leak or a dirty MAF sensor upstream of everything. On its own, with bank 1 healthy, look instead at things specific to bank 2: an intake gasket leak on that side, or an injector issue on those cylinders."
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:
Same story as P0171 but on the other bank. Bank 2 is running lean, too much air for the fuel. The important bit: if you've got this together with P0171 (they very often show up as a pair), that's your biggest clue. Both banks lean at once means one shared cause, not two separate faults: a vacuum leak or a dirty MAF sensor upstream of everything. On its own, with bank 1 healthy, look instead at things specific to bank 2: an intake gasket leak on that side, or an injector issue on those cylinders.
Usually, yes, in the short term, the same as P0171. Whether it's safe really depends on whether it comes with other symptoms. If the car drives normally, book it in or dig into it soon. If it runs rough or hesitates, get it checked before you drive far. If the engine light starts flashing, ease off and stop when it's safe to.
The same as P0171: often a rough idle or hesitation, sometimes nothing much at first. A lean engine runs hot, and left alone it can start hesitating, idling rough and eventually doing damage. If the engine light starts flashing, that usually means a misfire. Ease off and stop when it's safe to.
Often pennies. A split vacuum hose or MAF cleaner costs a few quid. A replacement MAF might be £50-150 fitted. An intake gasket is a bit more labour depending on the engine. The dear end (fuel pump, injectors) is much less common, so don't start there.
Because both banks are lean at the same time, which almost always means one shared cause sitting upstream of both: a vacuum leak or the MAF sensor. It's actually good news: one cheap fix usually clears both codes.
Free app. Plug in, and get every code in plain English, plus the connections you'd never spot.