I write only for the friend with the 208 that has the P20EE issue.... This problem is not to be ignored. It is a valve problem, and if you don't address it soon, you will have much worse problems.
*** Note to everyone.
It is a good machine, but it is not a toy. It is a tool.

- It works on a 2002 TOYOTA MR2 (VVT-i 1800cc). It detected the same P0155 code on the oxygen sensor that the workshop machine had found. It shows you both the code and the error description.

- I reset it and the indicator disappeared. Of course, as others correctly mentioned in their comments, clearing the indicator does not solve the problem, but at least it shows you how critical the error is so that you can act accordingly.

- One detail that may confuse some people is that as soon as you connect it, it does receive power and the menu works, but (at least in my car) in order to detect an error, you need to turn the key to the position before it starts, where the indicator lights turn on, otherwise it won't find anything.

- Note for those who have issues with foreign languages, the menu does not have Greek.

I recommend it.

In Peugeot 208 bluehdi 2017 with error code P20EE, it clears it perfectly. Very honest for its price

Carefully packaged, comes with a carrying case, works flawlessly on a Mazda MX-5 (2001), reads error codes, clears check engine, etc.

It works perfectly on a 2007 Smart 451 with a 1000cc engine. It connects easily and does everything it promises, reads and clears MIL (Malfunction Indicator Light) or check engine light codes. It also supports Live Data and Freeze Frame Data for those who are familiar and want to dig deeper.

I cannot rate it positively personally because it did not work. In a Volvo S40 with the airbag light on, it was found through Volvo diagnostics that it is the seat belt sensor. This specific machine shows me 0 on the error codes.

It works very well on the Mitsubishi L200 and I managed to fix the P0106 Manifold Absolute Pressure fault that used to occur once a year. When it happened again, I thoroughly checked and found that the tube leading to the barometric pressure sensor was torn at both ends. I removed the damaged sections and since then it has been working perfectly.

I used it as a test and it seems to work fine.
Time will tell if it causes any real damage to the car.
Mercedes W212. E 250