Suddenly my BMW had a rough engine on start, white/gray smoke out of tailpipe on 2008 BMW 535xi

I recently fill up the tank and since putting in that gas the car has gone haywire. It's too coincidental that this started with the fill up. Oil change was done 1 week ago, GoodYear gave it a clean bill of health. Took two long distance trips (each +6 hours driving each day - ran like a dream). Filled up because I had to at mini-mart, 93 octane, but engine ran rough the next morning. No acceleration until it is very warm (after running 10 minutes it seems to work fine, except not today). Sputters and shakes like I'm lugging down in a high gear. Error codes are (from my handheld): MIL DTC 2-18-2012 P0301 Cylinder 1 Misfire Detected Stored Codes P0139 O2 Circuit Slow Response (Bank 1, Sensor 2) P0300 Random/Multiple Misfire Detected P0301 Cylinder 1 Misfire Detected P0303 Cylinder Number 3 Misfire Detected Pending Codes P0139 O2 Circuit Slow Response (Bank 1, Sensor 2) P0159 O2 Circuit Slow Response (Bank 2, Sensor 2) P0300 Random/Multiple Misfire Detected P0301 Cylinder 1 Misfire Detected P0303 Cylinder Number 3 Misfire Detected P0306 Cylinder 6 Misfire Detected (from yesterday) MIL DTC 2-17-2012 P0301 Cylinder 1 Misfire Detected Stored Codes P0140 O2 Circuit No Activity Detected (Bank 1, Sensor 2) P0300 Random/Multiple Misfire Detected P0301 Cylinder 1 Misfire Detected P0302 Cylinder Number 2 Misfire Detected P0303 Cylinder Number 3 Misfire Detected Pending Codes P0302 Cylinder Number 2 Misfire Detected P0303 Cylinder Number 3 Misfire Detected P0420 Catalyst System Efficiency (Bank 1) Below Threshold The exhaust smells like gasoline, so there must be incomplete combution. I'm planning to take it in, it's under extended warranty. The shop isn't open until Monday, so I thought I would post to see if I can get any upfront knowlege prior to taking it in under warranty.

by in Frisco, TX on February 18, 2012
1 answer 2 comments
ANSWER by on February 18, 2012
This sounds like an old truck I have I had the white smoke , some refer to it as "steam " < because it is , my problem was a head gasket , liquid glass fixed it for a year but the third time was the charm I did end up changing it well both head gaskets actually I would never suggest to just change one head gasket if their are two heads. It has been my observation over the years that if you get an engine a bit to hot , that in about two to three months you can bet it will blow a head gasket. good luck with your ride. ~ FIRE ~
COMMENT by on February 26, 2012
The fuel injection system failed. They replaced the injecors, spark plugs, high pressure fuel pump, and did other recall work that the car needed. Total charges were 3,000 (2,100 labor). They had to do another oil change as the fuel had mixed with the oil and they needed to clean it out. All of this was covered between BMW's recall program and my extended warranty, so only cost me 50 bucks and an oil change.
COMMENT by on February 26, 2012
Great glad it worked out , another happy ending ~ FIRE ~

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