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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old January 27th, 2019, 13:00   #1
Wildbill963258
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Default Just bought a passat station wagon tdi

And immediately upon driving it on the road I noticed that it didnt have enough power to maintain speed going up hill, only time it does is when I first take off in it (I immediately figured out that it was going into limp mode) and have since pulled the codes and 2 are turbo under boost and faulty mass air flow sensor reading. I cleared the codes once and it immediately drove better for about 3 miles but then went back into limp mode. I'm getting ready to have the codes pulled again and compare the codes now to what they were the other day before they were cleared. If the turbo under boost code pops up again I'm gonna start where the previous owner said it was messing up he said that the IC boot popped off and has since fixed it but I'm not entirely certain that he sealed it properly, is there a way I can test for leaks without having to go buy anything?
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Old January 27th, 2019, 13:06   #2
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I also keep getting a light on my dash where it has a arrow circling an explanation point and the light comes on each time it goes into limp mode any idea what that light means?
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Old January 28th, 2019, 06:07   #3
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Anyone have any ideas?
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Old January 28th, 2019, 06:38   #4
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I believe the arrow and explanation point is a low oil light. Not to be ignored, if I'm right. Check the oil. If the level is OK, then you may have a faulty sensor.

Regarding limp mode, issue could be any number of things. For guidance, look here: http://forums.tdiclub.com/showthread.php?t=179589
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Old January 28th, 2019, 08:53   #5
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Is the warning light yellow or red?
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Old January 28th, 2019, 08:57   #6
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OBD works, start there.

The owner's manual has all the warning light explanations, but it sounds like the ESP light is what you are describing.

If you have a MAF DTC and an underboost DTC, you most likely have a charge air leak, and a brake torque with a helper will usually find it in short order. One of the 4 big charge air hoses, two of which I have never ever seen fail. The ones that can fail are the S-shaped one coming out of the turbo to the crossover pipe, the other is the little L-shaped one going into the intake, near the firewall.
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Old January 28th, 2019, 11:42   #7
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The warning light is yellow
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Old January 28th, 2019, 11:44   #8
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Quote:
Originally Posted by oilhammer View Post
OBD works, start there.
The owner's manual has all the warning light explanations, but it sounds like the ESP light is what you are describing.
If you have a MAF DTC and an underboost DTC, you most likely have a charge air leak, and a brake torque with a helper will usually find it in short order. One of the 4 big charge air hoses, two of which I have never ever seen fail. The ones that can fail are the S-shaped one coming out of the turbo to the crossover pipe, the other is the little L-shaped one going into the intake, near the firewall.
Can you please explain that last part a little better? It kinda sounds like you started mid sentence and doesn't really make sense
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Old January 28th, 2019, 12:06   #9
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???? Not sure I can make it any clearer.

Yellow warning light with an arrow going in a circle is the ESP warning lamp. If it is ON, either the system is turned off (via the dash button that says ESP), or there is a fault in the system, which would be resident in the ABS. ESP is part of the ABS.

Your two DTCs suggest a charge air leak. A boost leak somewhere between the turbocharger and the intake manifold.
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Old January 28th, 2019, 13:40   #10
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And Oilhammer is saying to check for boost leak, step on the brake and throttle at the same time, like doing a brake stand. Have someone listen for a boost leak and then track it down.
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Old January 28th, 2019, 19:09   #11
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Ok thanks I will definitely hop on it this is my primary car for until I get my truck back. Paid $800 for it so I expected to have problems just as long as it ran and drove.
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Old January 29th, 2019, 00:04   #12
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One other question I have an auto and some of the codes that popped up when pulled was the torque converter not locking/shift solenoid messing up. Can I change the fluid and filter and that will fix it or will it be more complicated than that?
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Old January 29th, 2019, 01:43   #13
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You will need a new converter to fix that. Common issue.
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Old January 29th, 2019, 02:28   #14
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How costly is it?
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Old January 29th, 2019, 02:54   #15
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Couple grand.
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