1999 SL500 R129
Hi, everyone! I'm having a weird issue with my '99 SL500. My CEL continues to come on, but my shop says there are no stored codes. In the last week, I've replaced the EGR valve and the shop has done a smoke test to make sure there are no vacuum leaks. The car runs great and I'm getting good mileage. In the past, it would come on every so often, then go off again after several starts. Last week, however, after the EGR valve replacement, the CEL came on and stayed on for a week. Friday, I went back to the shop for the smoke test and code check; nothing. They cleared the code. Then, last night, it reappeared...