1. Check the engine oil level. If the oil level is low, it can cause the engine symbol light to come on. Check the oil level with the engine off and on level ground. The oil level should be between the "MIN" and "MAX" marks on the dipstick.
2. Check the engine coolant level. If the coolant level is low, it can also cause the engine symbol light to come on. Check the coolant level with the engine off and on level ground. The coolant level should be between the "MIN" and "MAX" marks on the coolant reservoir.
3. Check the spark plugs. If the spark plugs are worn out or damaged, it can cause the engine symbol light to come on. Check the spark plugs by removing them and inspecting them for wear or damage.
4. Check the oxygen sensor. If the oxygen sensor is faulty, it can cause the engine symbol light to come on. Check the oxygen sensor by disconnecting it and measuring the resistance between the terminals. The resistance should be between 10 and 20 ohms.
5. Check the catalytic converter. If the catalytic converter is faulty, it can cause the engine symbol light to come on. Check the catalytic converter by looking for any signs of damage, such as cracks or leaks.
If you are not able to identify the cause of the engine symbol light, it is best to take your Mini Cooper to a qualified mechanic for further diagnosis.
