My 1998 S70 T5 95,000 kms got the upside down "Y" warning light on recently. Had the code checked and it indicated a problem with the Air Mass Meter... Had the light reset but it came on again a month later. Q: Is installing a used AMM worth it (halfprice)? How often do they have to be changed? Can I reset the light without going to the garage? I read previous posts on this topic and had cleaned the connection prior to the light coming on a 2nd time... Thanks