Hi Tom, thanks for joining us, fairly sure I've driven through Aachen at some point

Do you get your MCU error when you are running on petrol, or just on autogas? Its not uncommon to get cat-diagnosis lambda errors when running on autogas, a friend with an opel had the same issues recently.

In general, you should use VCDS for diagnosis. Nefmoto is for reading/writing maps to your ecu, but in this case you probably want to disable the secondary lambda sensor in your ECU, so you would need to read the map from your ECU, edit it and write it back.

The only issue may be the chip tune you already have, as some tuners deliberately make it hard to read/write the tune, or try and hide the data in the map so you cannot edit it.

Your first step is to read the nefmoto getting started guide and read the map from your ecu, but please dont post it if it is a commercial tune.

Hi turboat,

the seller told me that the errors orccur only in gas mode. But is sometimes happend with normal fuel operation also. The fuel consumption is also 10-20% higher than usual (even in normal fuel mode, gas is 20% extra).

I'm thinking of purchasing a used MCU and get the IMMO cloned from my cars MCU to the 2nd one. Then I could try the standard, unchipped mapping without loosing the option to get back to 194HP. Depending on the results I would then change the catalytic converter, adjust the setup of the gas system or change/adjust the mapping of the MCU.

Regards
Tom

you can flash 2002 ECU over OBD so no use for second ecu.

just back up the 194 hp software and write original software on it to test it.