Horrible MPG, but car runs excellently? 2012 Jetta Sportwagen

coolusername

Well-known member
Joined
May 4, 2022
Location
Orange, CA
TDI
2012 Jetta Sportwagen TDI
If they are anything like dealers in the UK. Then without a CEL your unlikely to get anywhere.

You can imagine it. Hundreds of customers walking through the door. Blaming their MPG on exhaust
I'm optimistic, my dealer's been good to me. They spent two weeks last summer hunting down an occasional no-start that ended up being a slightly loose plug connection near the fuel pump, and then they replaced the crank position sensor and somehow got it all covered under the Dieselgate warranty. And I had a nice, covered rental during the time period.
 

coolusername

Well-known member
Joined
May 4, 2022
Location
Orange, CA
TDI
2012 Jetta Sportwagen TDI
did you find soot in the tailpipe ?




Is this sooty? I can barely get anything on my tissue paper unless I scrub it round inside the exhaust pipe, but it still doesn't look quite right. I can't tell if it's just dirty from normal use or anything different.
 

Shoveltrev

Veteran Member
Joined
Feb 11, 2015
Location
Hutchinson ks
TDI
2002 new beetle deceased, 2003 jetta . 2002 jetta , 2012 sportwagon
so grey ash is good anything black is not. its really just another symptom. vw service bulletin sayspull the egr filter off of the dpf and check it for sooot. if there is any soot in the egr filter the dpf is compromised . . thats how they are supposed to do it anyway. my stock cjaa regens every 450 or so miles and thats half as much as yours and i do a lot of in town driving. a lot . like 300 out of those 450 miles .just my observations
 

Shoveltrev

Veteran Member
Joined
Feb 11, 2015
Location
Hutchinson ks
TDI
2002 new beetle deceased, 2003 jetta . 2002 jetta , 2012 sportwagon
something else you can check is do a cold soak test of all your temp sensers. egts coolant and iat. after it sits overnight they all should be within 10% of each other .
 

Full Circle

New member
Joined
Jan 24, 2023
Location
Central TX
TDI
2001 Golf GL 2DR HB 5spd manual 93 Ford F250 7.3 IDI NA / sold 2009 VW SW / 2010 GOLF / 2014 BMW 323D
The EPA CARB CA clowns are choking the S+!t out of your engine.
 
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