I have an 2004 mk1 st170. I'm having a number of issues and nothing I do seems to be making any difference a X I can't seem to find the exact issue. From the start, EML light is on, codes came up are p0135, p0141, p1131 and p1132. I have changed both lambda sensors with genuine sensors from euro car parts (as far as I'm aware they are genuine as they come from euro car parts) no change in EML light. A little while later like a few weeks the battery light come on on the dash and the alternator and packed up, changed that with again a genuine alternator from euro car part. Few hundred miles down the line battery light comes on again and the new alternator is not charging? So take that back change it for a new one and that's been in since. Since then we found the aircon was draining the battery making it look like the alternator wasn't charging, 200 miles down the line this alternator has an intermittent wine, lights flicker on the dash cluster, and the headlights flicker. I'm having lacking power problems like something is holding the car back. Now I'm lost on how to solve my issues. The current codes are the ones I've mentioned plus I've got a brand new alternator (done 200+ miles) which wines and it seems to be over fueling/running rich! If anyone can help id be over the moon! This has been doing my head in and bank balance for a while!