P0171 system too lean bank one… probably an air leak after the maf sensor in the trunking somewhere… engines getting unmetered air … the 02 sensors picking up on it and the maf sensor is registering it.
Bank one if I am correct is from the front of vehicle the cylinders on the left .. numbers 1,2,3 with no 1 at the front of engine.

Thanks, I'll check the engine again. I believe the P0171 code was there before I went through a sealed all the Turbo tubing and replaced the intercooler hose on the exit side of the cooler. It only registered the P0101 after this was completed. Your input is appreciated.

I may have missed it, but did you put in a new batwing assembly? You mentioned earlier that the old one had cracks by the air filter inlets. If so that might be one of the sources of an air leak. Sorry if I am barking up the wrong tree...

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)

Yes. The "batwing" assembly was replaced. It is the only way you can buy it. Can't buy MAF sensors separately, nor can you buy the plastic tube separately. Unfortunately.

OM642 cylinder numbering pattern is:

3 6
2 5
1 4
(Front)

So bank 1 is the right side of the vehicle (passenger side in the US).

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

To all. It took a long time and going to a couple of shops, but, the code problem was finally solved. It turned out the MAF intake "batwing" was not communicating with the ecm correctly and the system had to be recalibrated to clear the codes. I took the car to Power Star Automotive in Greenville, SC. The owner is a former MB master tech and has the factory Star diagnostic system. It took them several tries to get the car to function properly. Thanks to all for the constructive suggestions and input.

In starting this thread 2 years ago I was trying to determine limp mode and excessive oil consumption. As mentioned in last post the limp mode was solved. However, almost 2 years later and only 4k miles put on the car, the oil consumption was solved. We only used the car locally as a backup to minimize the oil usage. But, during this time I continued the investigation. This spring I found a Youtube video titled Sprinter Turbo replacement. It's well done by a true mechanic. He pointed out the reason for the change. With engine running, you could see a stream of oil coming out of the turbo. So, I removed the intake tube from the turbo and didn't even need to start it. There was a black oil residue line in exactly the same place as the video! Installed a new Garrett billet turbo and went through the whole system cleaning and resealing a o rings. since completion, the car has been driven a freeway speeds for 200 miles with no oil loss. NOTE: there was no wobble in the turbo shaft it was a failed seal. I always hate when a thread gets started and there is never a solution given. Hope this helps others!

Good work! Can you post a link to the video that helped you?

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2009 E320 Bluetec - 242k miles and a work in progress!

Hi All. YES, I am intentionally reviving this old thread because it mentions several issues that have come up on our w211 E320 bluetec cars and I wanted to try and help others who have these issues. My wife's 2008 E320 has 265K of nearly trouble-free service with the exception of a blown tensioner that shredded the belt, worn out motor and tranny mounts and the dreaded oil cooler seal job that cost $2500 shortly after we bought it. She put 200K+ on it doing home visits as a Hospice RN over the last 4 years and it has served her very well until last year when it started losing oil somewhere. We chased the oil "leak" and the first one was the oil filter housing, which was replaced. A month later a leak turned up at the oil filler cap- which dripped down and shorted out the alternator, which required the alternator and before killing a second alternator, the filler cap to be replaced. We still have a leak but haven't been able to find it, but the oil consumption had increased MORE than what is left on the belly pan or the driveway. It was going SOMEWHERE. We continued to top off the oil for a couple more months because our regular mechanic was so "backed up." Then one night the 320 lit up the CEL and went into limp mode when she exited the freeway on the way home. My cheap scanner proved useless. So, based on a recommendation, the wife bought me an IcarSoft scanner for my bday (which has proved itself over and over- including reading codes on the 2005 ML500 and 2006 Audi A4.) Her E320 threw codes for the DPF. So, after calling around, watching a ton of videos, calling my old mechanic, we decided to have the DPF "flushed" by a shop here in Virginia vs pay $3K for another one. They did an outstanding job and turned it around in 3 days from removal to re-install at a diesel shop and for $800 the whole job with labor was done and included an oil change and new air filters. The car felt like 100% power was restored, she got 34 mpg and everything was great. But the oil consumption continued at the same rate as before. No smoke, no drips, but every 2 weeks she was a quart low or more. We scheduled to bring it to the regular shop. That weekend, after several after-hours emergency patient visits, the wife called to report the e320 had nagged to check the oil, was down on power and had a new "noise." A high pitched metallic squeak/hiss that increased with rpm. I checked the oil and shockingly there was nothing on the dipstick. 4 quarts later it was filled. I cant be sure but I think the turbo is toast and this is where the metallic hissing sound is coming from. And like the original poster suggested, I think now that the DPF was wrecked from the turbo leaking oil into the exhaust. I will pull the batwing and check for play in the turbo and if I can do it myself, check the line that the OP mentioned. I suppose 265K is a long life for a stock turbo, not to mention the crappy seals MB used in this vintage, but I really hope that replacing the turbo brings joy. This has been a good, generally reliable car and we'd like to hold onto it if we can affordably.

My 2008 E320 is throwing p2530 for the swirl flap motor "shorting to ground." I have had to replace the batwing and ound the oily connector for the swirl flap motor. I cleaned the connector and have done the resistor trick but still getting the CEL. There is a post on MB world that mentions blown fuses so I'll check that next. But I have decided that these cars are plagued by oil leaks due to garbage o rings and seals. 5 cent parts doing thousands in damage. At any rate- if you're getting these codes, check for... oil leaks.