Hello, I’m just coming back from a ride and suddenly the MKL is yellow. Otherwise everything is fine, good gas acceptance and performance, no noises. Then I open the bonnet and see some oil on the underrun protection below – see photo. Engine oil level normal. Maybe to the vehicle: SLK 200K (R170), switch, BJ. 04/2003, 187,000 km, always everything waited. Now my short questions: 1. How do you read out the error memory (software, cable), there is a WLAN adapter for r iPhone & Co Mercedes for iOS? 2. Where does the oil come from and could it create the error on a sensor or cable? Thank you and best regards carrier bag