conoral11

Hi there, I've got a 07 MK2 Fabia 1.2 HTP that didn't have the greatest working air con when we purchased it 3 years ago. We had it serviced and drained/re-gased two years ago, and had dye put in to help detect any leaks. Worked fantastically for a year or more. Turns out the Pressure sensor has alot of green dye around it, and the air con system is noisier again, similar to what made us get it re-gased in the first place. Does anyone know what the part number is for the o-ring that sites between the air pressure sensor and pipework? Does it come standard with a replacement air pressure sensor? I'm wanting to replace it before before going for another drain and re-gas.