Just got the X5 home. It's running great with "NO" smoke. Temperature is normal. I ran the code scanner and found: PreCat Oxygen sensor slow response cyl. 1-4, AfterCat Oxygen sensor aging cyl. 1-4, Misfire cyl. 1, Misfire cyl. 3, Misfire, Random/multi cyl, Secondary Air System #5-8, Map controlled Thermostat circuit/control, Engine cooling fan control. I checked the oil level and it was perfect with no moisture present and checked the coolant level and it was perfect with no oil present. Plugs were fresh before the incident. I'm at wits end now. I don't think a leak-down test is really necessary now........but what is? I cleared the codes, to include the "SES" light. Any help is appreciated.
Glen