rayleiwu

As always, I filled it up w/ B5 soy last night, this morning when I started the truck, check engine light was on.... this has happened on my VW Passat 2.0T many time in past 3 yrs..but this is a M-B i thought it was supposed to do better than a VW...

I checked the oil level, it seemed to be normal. Could it be the typical German engineering thing?

Anyway, will call dealer up on Monday to get it checked (along with 2 recalls.)

lkchris

Did you get the fuel tank cap back on securely?

rayleiwu

The cap was fastened, I'm also pretty sure I filled in the diesel, not the gasoline....

maxmini

Did you try tele-aid? They can diagnose it remotely.

alx

... you know that due to variations and lack of quality control for biodiesel manufacturing- it is not recommended nor supported- right?

i would not tell them that you have filled your truck with b5... unless you want a new high-pressure fuel pump, injectors and prolly tank installed on your dime and your warranty voided...

just a thought...

alex

rayleiwu

Thanks for the advice, Alex! I won't say anything even the manual said b5 is approved by M-B. No more b5!

Fourdiesel

Up to B5 IS approved for your car by Mercedes. In some places (Portland Oregon for example) ONLY B5 can be sold! As long as the fuel is from a reputable diesel supplier it shouldn't cause a problem. My guess is the CEL is from something else. See your dealer on Monday. It will be covered by the warranty but is still a PITA.

StevethePilot

Your system will tell them if the error code is due to bad fuel, which the dealer automatically turns in to a need to flush the system and re-try with clean fuel to see if anything else is affected. Personally, I'd like to know how reliable that particular system is but I'd be willing to bet it's pretty sensitive - like overly so.

alx

in a diesel motor _everything_ is fuel-related

i would never put b5 in my diesel cars just because the b5 is a very aggressive cleaner and if you have not been running it on a regular basis and you have deposits.. and once you "rinse" with b5... junk will clog the fuel filter, the injectors... etc...

alex

Fourdiesel

It's a little hard to believe that a solvent like SME (biodiesel) diluted to 5% with D2 can have any significant effect on fuel system deposits. Especially when the OP states he has only 3000 mi on the clock. In order to make deposits that might be released, the original fuel would have had to be so dirty the car wouldn't have run at all! He also states that he has always run B5.

rayleiwu

Just back from the dealer, it's the temp sensor,

PERFORM SHORT TEST. PULL CODE 10EF00 EGR TEMPERATURE SENSOR PLAUSIBILITY ERROR.
TEST EGR TEMP SENSOR VALUE 107 DEGS BOOST AIR TEMP 85 DEGS SPECIFIED VALUE MUST NOT VERY BY MORE TAN 59 DEGS OK
INSPECT FOR CORRISON OR LOOSE CONNECTION OK
EARSE CODE

RECALLS: #2009-07-0002
#200909002

Fourdiesel

Looks like they didn't do anything but check for loose/corroded connections and cleared the code. Hope it doesn't recur.