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If the yellow warning light comes on it means the system is temporarily unavailable, possibly because the sensor is either too hot or cold, or clogged with dirt. Try waiting for the sensor to cool down/heat up, and check to see if there is anything blocking the sensor.
A flashing yellow light means poor flame sensing. This is usually caused by the flame sensor being dirty and/ or the burner being rus ty or corroded. Remove the flame sensor, located opposite of the ignitor, and clean with sand paper or steel wool. If this does not fix the problem the burners may need to be cleaned. I recommend a trained HVAC person do this. This is a picture of a flame sensor
Hope this helps.
Bob
The above "Guru has no idea what he is talking about. The yellow oil light means you need a new oil level sensor, if your oil is indeed full. Its located in the oil pan and costs around $100.
Oh, and oil changed are around 15,000 miles, not 6000 miles. When the BMW is due for an oil change or inspection, the display says so. The yellow light is low oil. Please avoid giving advice when you don't know what you're talking about.
Hope this helps.
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