2004 Golf, manual transmission. The yellow check engine light comes on when it’s driven on the highway for more than 10 miles or so (60-70 mph).
The light goes off on it’s own after about 36 hours of suburb driving - 1-2 miles at a time on suburb roads, lots of lights and not going over 40 mph.
Any ideas on why the light is coming on? No other signs of trouble occur - oil looks good, temp stays fine, no smells, etc.
Any ideas on why the light goes off after 4-6 miles/36hours?