Intermittent check engine light
07-03-2014, 01:43 PM
#1
Newbie
Thread Starter
Intermittent check engine light
On my 2008 W211 E320 Bluetec, for the last year my check engine light intermittently comes on for a few hours/days then turns off for a few days/weeks. When I took it to the dealer, they found no error codes stored other than signs of low voltage occasionally. I have replaced the primary battery. Any other ideas?
Thanks.
Thanks.
07-06-2014, 01:38 PM
#3
Super Moderator
If you really think it is power related it could be Voltage regulator or whole alternator or of course a bad wire somewhere. I doubt that it is power related and the dealer probably was reading a very old code.
When you use star and read codes it will show you codes that could be years old vs days so it is a guessing game. It does tell you if it is a current code or a not current code. I have found dealers love to leave old codes after fixing something so when I hook up cars to star they have codes that I or the car owner knows are years old. So if your car is throwing a CEL it will be in the history. What I would do is get a scan tool and next time the CEL pops up scan it right away and see what it is.
When you use star and read codes it will show you codes that could be years old vs days so it is a guessing game. It does tell you if it is a current code or a not current code. I have found dealers love to leave old codes after fixing something so when I hook up cars to star they have codes that I or the car owner knows are years old. So if your car is throwing a CEL it will be in the history. What I would do is get a scan tool and next time the CEL pops up scan it right away and see what it is.
