Legacy BL/BP 2004 LPG 2,5l 121kW error message

Hello dear Subaru friends, I still have a little problem with my Legacy BL/BP 121kW 2.5l from 2004: I used to buy the vehicle at the beginning of 2010, after a few weeks the engine control light came in combination with flashing cruise control bells (“CRUISE”, when I then drove to my Subaru dealer (not the one I bought the car at), because the chief mechanic told me that the problem was known at Subaru and most of these (LPG) vehicles were within the scope of a rear view. ufs/Kulanz were improved – with my apparently not (the complete exhaust is, according to my Subaru dealer, who sold me the car, excluded from the used car warranty) cause is a signal from the cat – the trigger the engine control, the problem is none – I just would not have the error message and the cruise control – after a while the lamp is out again and the cruise control goes forward, often the problem occurs as a result of stronger Speed up if that bothers me (the problem is about 75% of the driving time), I can have a new cat installed or a regenerated cat – or I could have the error repeatedly deleted (that’s not so great – my dealer is 40min away) the gas system otherwise does not cause any problems – is a system built in by Subaru Germany (Teleflex), from the first kilometer the vehicle drives with it (and the 40Tkm I have it – except for this thing completely flawed Rei) now I have overcome myself, because the lack of cruise control bothered me to invest the money within the scope of an upcoming inspection (300€ plus VAT) and to have a regenerated cat installed, as my car dealership has already done several times, according to its own statement, that happened now two weeks ago – and I was happy – the mistake did not come again – until before! there he was again – WHAT IS HERE LOS? Can someone give me advice? Thank you for your help!