remap quattro

Hi all Recently I did an DE CAT eml light came up checked VCDS says O2 sensor fault been advised to map it out so remapped car to stage 2 and they did a O2 patch EML light went but end of day the eml light came back on same fault code O2 sensor they mapped it out again but end of day eml light...

Hi all hope this is the correct place to ask. I’ve been looking and can’t find anything specific to my car It’s a 2002 1:9 TDI Quattro 1:30 engine. Hope that’s specific enough sorry if not lol I’m looking at getting a re map. Have cleaned the EGR. Clutch is good. Car seems spot on but I’ve...