Emissions & auto
Key points: MED17 lambda catalyst
- The software number decides the emissions stage, not the model year on Wikipedia.
- Deletes (DPF, EGR, OPF, SCR) are a different product from a stock original file.
- Road-use legality follows where the car is registered; this site sells virgin dumps.
MED17 petrol ECUs run upstream and often downstream lambda. CAT off disables monitoring when the catalyst is removed — off-road / competition in many regions. A stock original from this site restores the factory oxygen-sensor logic.
What the ECU is actually running
| Topic | In the flash |
|---|---|
| LSU / Nernst | Wideband upstream on most TFSI |
| Rear lambda | Catalyst efficiency |
| OPF | Separate from CAT on later cars |
Original files vs deletes
ecuflashfiles.com is the original-file side: virgin dumps by software number. Stage 1 and fuel-specific deletes are quoted on ecufilemarket.com after you upload the original. Mixing those two products is how SW numbers get overwritten with the wrong intent.
Original dumps sold on ecuflashfiles.com are for restore, comparison and workshop use. Stage 1 and delete work belongs on ecufilemarket.com. In some regions DPF off, EGR off, OPF / GPF off, SCR / AdBlue and even Stage 1 may be used only on off-road and competition cars. Confirm the law where the vehicle is registered.
FAQ: MED17 lambda catalyst
Does MED17 lambda catalyst mean I can delete DPF or AdBlue?
No. This article explains what the stock flash contains. Deletes are a separate, often off-road product on ecufilemarket.com.
How do I know if a car is Euro 5 or Euro 6?
Read the software number and the original dump. The ECU family name alone does not decide the emissions stage.
Will an original file pass MOT / ITV?
It restores factory calibration. It will not hide missing hardware (no DPF in the exhaust, cheated sensors).