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Discussion Starter · #1 ·
re 740iL '01: The 'Service Engine Soon' light, starting about a month ago, comes on for say three days, then goes off for two or three (days). Then the cycle repeats itself. I don't have any 'problem symptoms' that I know of, the car is running beautifully. ?? Thanks in advance.
 

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Seek to understand,^Value
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I think the reason the light goes off is you've run the entire FTP cycle without problems:
- How to better understand the key EPA federal test procedure (FTP) concept of the BMW SES "drive cycle" (1)


Many of us keep this $22 scanner in our glovebox to read diagnostic trouble codes:
- Where to get the cheapest reasonable OBDII scanner in the world (1)
 
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