I have a Mini Cooper with check engine light on and 3 codes came up: P0172, P0455, and P0442, can some help me find out what this is and how to fix it, thank you in advance.

Could be as simple as a gas cap. Evaporate is vacuum pressure to the gas tank . A rusty fill nozzle possibly?

Here's code P0442.Here's code P0455.Here's code P0498.

• P0498 Evaporative Emission System Vent Valve Control Circuit Low

All the P0300 codes are engine miss codes. The P0455 is a catalyst inefficiency code and the P0172 code is a rich mixture code. All of these could be caused by faulty oxygen sensors. What kind of car, engine size and mileage is it?

What code ? P0442 or P0456 or p0455
DTC EVAP P0442 P0455 P0456
EVAP Leaks P0442 and P0455

Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc

you can look up these codes on actron.com or google that code

p0455-- emission control system ( a large leak ) the most common cause is a bad seal on fuel cap, remove and replace cap, if light stats on. replace cap. if not the cap it could be any where in emission system. p0442 is--same as above. Code p0442 indicates a fuel vapor leak in the EVAP control system. To fix this problem, remove and reinstall the gas cap. Clear the codes and drive to see if the codes reappear. If the code appears again replace the gas cap or inspect the system for cuts or holes in the tube or hose. good-day !

p0455 is evap control system no purge or large leak
p0442 is evap control system leak detected (small leak)

the cause for both could actually be a loose gas cap.

hello po442 ,po455,po456 is leak detected possible, check the gas cap , basicaly you have a leak that is larger than 0.020' and smaller than 0.040' in the gas evaporative system use your nose to find this one thanks

These codes indicate a leak(s) in the fuel system, it can be anywhere, you will have to crawl under and try and see where the leak is, you will need a scanner to turn off the light after repairing the leak(s)

P0442, P0455 AND P0456 are all evaporative leak monitor test failures (small, medium and large leaks). These codes appear anytime the integrity of the air space above the fuel or the lines to/from the vapor canister or purge valve. If there is no damage to the canister, check the lines that run under the van from the fuel tank and canister to the purge valve (under the hood). Also, check to make sure that the hoses are not split or disconnected where they connect to the purge valve. The P1684 is abit more confusing. This is not a valid DTC for your vehicle. It's possible the scanner the shop you went to is an OTC scanner that is reporting a false code. It's also possible they wrote it down incorrectly. The closest thing that makes any sense is a P1486 which would indicate a pinched hose in the same monitor system as the other 3 codes. Best of luck!