CEL P0299 code help please! - AudiForums.com



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Old 08-02-2009, 12:55 AM
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Default CEL P0299 code help please!

Newbie here, I have a 2005.5 a4 2.0t. The check engine light is on and the code is P0299=low boost. I have checked for air leaks and found nothing. The car seems to drive fine, maybe a little power loss, not sure it is my wives car so I only drive it every now and then. I dont know what to check next? Is there a sensor that commonly goes out on these cars causing the low boost code and cel? What should I do next??????

Any input is greatly appriciated.

Thanks in advance,
Donnie
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Old 08-02-2009, 11:36 AM
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Anbody????????????
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Old 08-03-2009, 10:20 AM
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P0299 Underboost is a commone CEL for when a diverter valve goes out. The stock diaphragm diverter valve is prone to tearing after a while. I got that error code and had only a slight tear in the DV.

It is really easy to check and/or replace the DV. It is located on the front side of the turbo. It is an electric DV, so there is an electrical connection running to it. Once you take that off, it is just a matter of taking out 3 hex screws and pulling it off.

The best part to replace it with is the new design for the B8. That part number is 06H 145 710 D. The cheapest place I found it was genuineaudiparts.com.

HTH
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Old 08-03-2009, 09:17 PM
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Thanks, I will look into that. How much did the new piece runya, and how many miles when you had the problem?
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Old 08-03-2009, 09:36 PM
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how can I tell if its cracked????
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Old 08-04-2009, 08:56 PM
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You can tell by looking at it. There will be a green diaphragm and it will have a tear in it if there's a problem. I had 65,000 miles, although a lot of them have torn earlier than that. I got mine off of the website that I mentioned. 70 something bucks.
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Old 08-17-2009, 10:17 AM
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Quote:
Originally Posted by clemsongt View Post
You can tell by looking at it. There will be a green diaphragm and it will have a tear in it if there's a problem. I had 65,000 miles, although a lot of them have torn earlier than that. I got mine off of the website that I mentioned. 70 something bucks.
im having the same issue can you please take a piture of the DV valve so i know im checking the correct part. sorry im not top savvy when it comes to cars.
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Old 06-29-2010, 10:14 PM
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I would like to see pics also!!!!! any updates donnie?
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Old 04-12-2012, 09:21 PM
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Old post.... I have the same issue, P0299 and P0420, low boost.... They replaced 2 DV's and the car is throwing the same codes. Audi said it now needs a new turbo and cat, I doubt its the turbo but a bad cat would make more sense.... too much restriction causing the turbo to not spool as it should. Any input on this?

Last edited by twistnboostA4; 04-12-2012 at 09:31 PM.
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Old 05-03-2012, 10:59 PM
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I am currently having the same code with my 2006 2.0T, its in the shop tonight getting a really good once over. A possible sludge problem could be the culprit in mine ... will know more tomorrow. I would rather it be a cracked DV, a loose hose, or something very simple.
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06h145710d, 20t, 299, a3, a4, audi, b7, boost, cel, code, light, low, p0299, po, po299

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