Helpppppp What Can I Do About These Codes??????????

**audi4u2nv** · 08-24-2008 09:27 PM

PLEASE HELP

..i have a 2002 audi a4 3.0 quattro....ive been having some a/c problems...(not frion)..today i scanned my car for to see whatsup

...the codes that came up were..

00819 - High pressure sensor

16825 - Evaporative emissions control system incorrect purge flow

16840 - pinhole leak detected in tank ventalation system

18036 - powertrain databus missing message from steering angle sensor

18043 - databus drivetrain missing message from a/c module

how can i exactly resolve each one of these?

oh and if it helps i cleared the codes..then drove exactly 18 miles and the CEL came back on..

if your in queens new york..and you can definitly help me out..ill pay you..

**G Men 08** · 08-24-2008 09:34 PM

omg that seems like a headache!!! hopefully its not as bad as it seems!! good luck man

**audi4u2nv** · 08-24-2008 09:44 PM

it is a headache..do any of these look familiar? and if they do..what did you do about them?

**downhillracer** · 08-24-2008 10:16 PM

wow thats a lot of codes. well i would say you have an EVAP problem, check the evap lines for a leak, also look at all of your ground straps, if any of them are dirty or corroded painted etc clean them, dirty or missing grounds can cause all kinds of problems!

**audi4u2nv** · 08-24-2008 11:18 PM

yeahh its too many...i dont know where to start

**FourRings80** · 08-25-2008 01:34 AM

read old guy's post#5:
http://www.audizine.com/forum/showth...ht=evap+system

16825:
Ok so usualy the N-80 or a bad non return valve would be the problem. Here's a picture of the N-80 (left) and a non-return valve (in red). They are located near the air intake.

N-80 (left): with the car off, unplug the N-80 harness and with a multimeter take the resistance (ohms) on the valve. If the coil is good you should get ~30ohms if the resistance is a lot higher the N-80 is faulty. If the resistance is ok, take the N-80 off and inspect it chances are it's clogged. When you start your car the N-80 should start clicking.

Non return valve (red): The valve should only circulated in one direction. So take it off and see if air could go in both direction. Be sure to reinstall the valve in the right direction.

16840:
-be sure the fuel cap is tight enough.
-small leak in the evap system. Either try to find it or may want the stealership to pressure test the system.

Hope it helps

**audi4u2nv** · 08-25-2008 10:27 AM

yeah....i tried that..that doesnt work..im going to change my gas cap..alot of people told me that my gas cap could be the problem..i smoked the car out..to pin point the leak..nothing was found..from both the front of the car and the bottom of the car..