Codes P0507 and P0171

With the codes you have the first thing i would do is check for a vacuum leak.

how hard is it to check for a vacuum leak? I am trying to do this repair by myself if at all possible as you can tell. What do I need to do to check for a vacuum leak? Thanks for you fast reply by the way!

You let the engine idle then.spray some carb spray around all.the vacuum lines intake etc.If the rpms go up down or the engine stumbles and dies.You found a leak.

okay, and let say that there is a leak. how do i detetermine where the leak is and what it is I need to replace?

Use the straw on the carb spray to narrow the stream you can pinpoint it pretty close like that like see if you find a leak and where it is and we will go from.there.

Do I need to disconnect anything in order to spray the carb cleaner into the engine? What exact parts do I need to be looking at?

Any vacuum hoses vacuum sources like intake gasket etc.You made need to remove a engine cover if its in.the way.

Did you ever find a Leak? I have the same codes, same car with 116000. I looked and sprayed the hoses with no luck. Is there a IAC on the car? Any help would be great.

A iac isnt going to cause the code P0171 you can try smoke testing it.

A PO171 is a lean code right? It was set 4 times. I thought if it was getting too much air around the IAC would send a lean code. I also thought they said PO507 was a IAC but the parts place couldn't pull one up. I've looked and pulled the throttle body thinking it was attached to it. Didn't see it.

So you have the 2006 A4 quattro?Which engine?

A4 quattro 2.0T.

There is no iac it uses a throttle servo to adjust idle heres a tip i found for code P0171 let me know what you find.



If you have a B7 (2005.5+) Audi A4 with the 2.0 that has a rough idle and complaint of hesitation along with a lean code and other codes (mine was a misfire, fuel pressure reg code, and idle speed code). Try and take the oil cap off when it is idling. If you cannot or when you do it sucks a rush of air into the engine then you have a PCV issue. These PCV's are crappy and have been revised (so I hear). It is located under the engine cover on the drivers side of the valve cover (see pics). The normal problem is they crap out from the boost pressure and then leak boost into the engine giving you a lower than expected boost pressure. Some times (like this) they can be damaged enough that they give a straight vacuum to the valve cover. Although they shape and design might be vastly different then that of other normal PCV's it is still suppose to perform the same task. There are after market tuning companies that make full metal versions of this unit that retail from 99-150 dollars. The dealership had them for about 60 bucks. Your choice.

Wow lots of suction in the oil cap. I hope to replace the PVC tomorrow. I'll keep you up to date on what I find. Are the pictures located somewhere else?

Heres the pics let me know how it turns out.

Where can the metal aftermarket PVC be purchased from? Do you have a reputable site you trust?
Also, if I went with the dealer, is there a way I can order that part online? Or do I need to call them. I live in a city that does not have an audi dealer.

Also, how do i know which version of the PCV I have? Im seeing stuff like "n" and "p" versions.
Im currently looking at this website :http://www.urotuning.com/Engine-PCV-System-s/2367.htm

The replacement part looks just like the original. They also have on that comes with a metal "breather tube". Whats the difference b/t all these?

Audi's are far from my specialty let me doing a little research on this.

Okay, greatly appreciated. Do I NEED to replace the breather tube? or can I just replace the PCV itself? Obviously as little money spent is better.

The pcv valve is leaking vacuum into valve cover so i would just replace the pcv.

Ok I talked to the dealer and set appointment. PCV is the trouble all covered under warranty. While was there they checked fuel pump lobe it needs to be changed as well. Recall on both and covered under warranty.

cobraphillip- There is a recall on the PCV? I dont have a warranty on my a4. So you got both of those repaired for free? Do i need a warranty to get a recall fixed? I was just wondering if you had a little more detail about that.

Recall on both. My car has 116000 on the clock. Its worth calling about.

so did you need a manufacturers warranty? or was it just the recall that qualified you. Did you get them fixed for free?

In shop now. Warranty ran out 95000. All being fixed recall on both parts. It should be free.

Great find on that one my online repair info didnt list a recall for that.

Hell yea thats a good find! I just scheduled an appt with my dealer too! PCV and two other fuel related parts are being replaced for free!!! Thanks for all your help! This is an awesome auto car resource!

Your welcome thats what were here for.We try are best to help everyone we can.

I'm miss spoke on the recalls. Fuel pump is a recall. The PCV is a TSB. Sorry I thought of that later. I'm glad to find this info. Thanks for all the help.

What is TSB? I called my audi dealer and im getting 3 parts including the PCV replaced for free.

A TSB is a Technical Service Bulletin.

Update:
I have gotten the PCV, the intake motor regulator actuator, and the low pressure sensor replaced by the dealer all for free. It did fix the problem with the two codes I was originally getting. Unfortunately, 2 days later, I had the CEL come on again! This time it is throwing a P0089 code. Anyone know what this might be???? Thanks! :)

I onlly see that code for the 3.2L engine you said you had the 2.oL turbo?

Yes. I do have the 2.0T and i definitely am getting the P0089 code.

I just checked both of my online repair info sources and it only lists that code for the 3.2L engine.Its for the low fuel pressure sensor.

Again...I definitely have the 2.0T and I definitely have he CEL light with the code P0089 on it reading "Fuel Pressure Regulator - Performance" VERBATIM. I used three (3) different OBDII scanners to make sure that was the code I was getting because of what you said about it not being for this engine. I have also checked many different audi forum sites and there have been many others WITH my same car and engine that have gotten this code before as well. I don't know what your sources are but theres gotta be someone out there that knows what is happening here. This site has been an awesome resource for me so far, and I'm not trying to shoot you down or offend you, but Im really just trying to figure out whats going on.

Iam trying to figure this out also i have mitchell ondemand and pro demand which is another version of mitchell ondemand.Its a online repair subscription let me do some digging on this one.

Here is some feed back i have gotten so far.
Could be a problem with the low pressure sensor (possible dealer warranty item I believe).... also if wrong oil is used, the cam & follower that activate the high pressure fuel pump on the head can wear out. Worst case will need a camshaft, cam follower & pump.