I have a 2005 x5 3.0 and my wife drives it. Last month, I smelt burned engine oil whenever after drove it for like 10 minutes. So, I ordered a valve gasket from BavAuto and replaced that gasket. The old one was pretty hard. Now, the burned oil smell is gone and It was driving good for a week or so. After the last gas fill up, the SES light came on. I took it to Autozone and had the guy there read the code: P1419 and P0174. P0174 is system running lean, p1419 indicates the secondary Air Flow Senor not working. I think I'm going to replace the sensor first and hopefully, that will take care of P0174.

Does that sound like a way to go? I don't know how easy is it to take the valve off to clean.

thanks.