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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKVI-A6 Golf family including Jetta SportWagen (~ 2010-2014)

VW MKVI-A6 Golf family including Jetta SportWagen (~ 2010-2014) Discussions area for A6/MkVI (2010-2014) Golf and Golf Wagons (Jetta Sportwagon in the USA).

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Old August 24th, 2014, 18:53   #1
vwman2
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Default Dpf clogging?

Hello all,
Last few fill ups I have been noticing lower fuel mileage. Always was over 40mpg and now I'm seeing 36 37 mpg. Our golf tdi has 159k on it and seems to run ok otherwise. Would like to know the soot levels but don't have access to one. Is the dealer my only option for a new replacment?
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Old August 24th, 2014, 18:56   #2
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My dpf fell off, now I get a constant 53/55 mpg. ..
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Old August 24th, 2014, 19:21   #3
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That option crossed my mind but being in nynj area that may be hard
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Old August 24th, 2014, 20:17   #4
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best to find someone local with a vcds to check the dpf load
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Old August 24th, 2014, 20:20   #5
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Originally Posted by vwman2 View Post
Hello all,
Last few fill ups I have been noticing lower fuel mileage. Always was over 40mpg and now I'm seeing 36 37 mpg. Our golf tdi has 159k on it and seems to run ok otherwise. Would like to know the soot levels but don't have access to one. Is the dealer my only option for a new replacement?
There are TDIs out there with well over 250k miles on the original DPF. It appears that the primary cause of DPF clogging is failed sensors (either EGT or differential pressure sensors) that do not get immediately replaced. With failed sensors, a regen will not take place - this is what clogs DPFs. Dealers are probably the main source for replacement DPFs, but don't jump the gun and assume that that is you problem. Find someone near you with VCDS and look at all of the DPF related measuring blocks. As long as regenerations are occurring regularly, the main this to look at is the ash load. This is the factor that will eventually lead to DPF replacement if a sensor doesn't fail to clog the works.

Have Fun!

Don
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Old August 25th, 2014, 05:21   #6
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should I be seeing engine codes if there is a failed sensor?


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Originally Posted by JSWTDI09 View Post
There are TDIs out there with well over 250k miles on the original DPF. It appears that the primary cause of DPF clogging is failed sensors (either EGT or differential pressure sensors) that do not get immediately replaced. With failed sensors, a regen will not take place - this is what clogs DPFs. Dealers are probably the main source for replacement DPFs, but don't jump the gun and assume that that is you problem. Find someone near you with VCDS and look at all of the DPF related measuring blocks. As long as regenerations are occurring regularly, the main this to look at is the ash load. This is the factor that will eventually lead to DPF replacement if a sensor doesn't fail to clog the works.

Have Fun!

Don
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Old August 25th, 2014, 08:42   #7
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should I be seeing engine codes if there is a failed sensor?
Yes, there should be a stored fault code and a CEL and/or DPF light. As long as regens are occurring, you should be OK. There are many possible causes for reduced mileage and your emissions system is only one possibility.

Have Fun!

Don

P.S. A VCDS autoscan never hurts, just in case.
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Old August 25th, 2014, 10:00   #8
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My dpf fell off, now I get a constant 53/55 mpg. ..
Man, what a bummer. I live in the rust belt so it's only a matter of time until I start her up one day and find the dpf magically eroded away.
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Old August 27th, 2014, 14:10   #9
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I have no idiot lights on the dash, filled it again today and still way off. It's about 100 miles less that it normally gets.
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Old August 28th, 2014, 14:02   #10
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first thing I would check is brakes and bearings and tires (oh my)

and if there is a fuel leak, or thermostat problem.
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Old August 28th, 2014, 15:28   #11
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I spun the rear wheels and you can def feel some brake dragging so I'm hoping that's where the problem is. They do seem very hot just after normal driving and I can now hear brakes dragging while driving. Where should I start with this rear brake issue? E-brake cables not releasing or caliper problem?
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Old August 28th, 2014, 16:03   #12
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I spun the rear wheels and you can def feel some brake dragging so I'm hoping that's where the problem is. They do seem very hot just after normal driving and I can now hear brakes dragging while driving. Where should I start with this rear brake issue? E-brake cables not releasing or caliper problem?
Can you lift the rear wheels off the ground and get under the car? You could try to disconnect the parking brake cable and see if that frees up the wheel. If this does free up the wheel it is a cable adjustment. If the brakes still drag without a parking brake cable attached, it might be a problem with the caliper.

Have Fun!

Don

P.S. I have never done this on a newer car, so I do not know how easy or hard it might be.
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Old August 29th, 2014, 04:15   #13
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one thing to note is that the parking brake operates by screwing in the piston on the caliper. if you never use the parking brake, it can get loose (meaning the part that screws in is not close to the hydraulic part of the piston) and cause trouble.

If you decide to work on the brakes yourself, there are good DIYs around. the piston has to be turned in to provide more room. you cannot just push with pliers or a c clamp.
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Old August 29th, 2014, 04:59   #14
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always use the parking brake every time car is parked.

thanks for the help
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Old August 29th, 2014, 06:30   #15
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The DPF is an emissions component, so enjoys an extended factory warranty beyond 60K Miles in the U.S.. I forget what the emissions component warranty is, but ours failed somewhere beyond 60K Miles and was replaced under warranty.
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