codes codes damn theses codes
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codes codes damn theses codes
i replaced oxygen sensor and the code (17521) came back. anyone ever experience this? i also have 16487 mass air flow and 16825 and 16826 emmission line. this would happen right before i have to get this car inspected. any help?
AudiWorld Senior Member
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One more thing to check
real quick, is the hose connecting the air filter box to the throttle body. Make sure the rubber attachments on both ends are properly seated. Also, make sure the air filter box is secured properly. It is 99% likely you have an air leak in your intake system. I had similar codes pop up over the winter on my A6 and turned out to be a bad vacuum line connecting to the air intake (this after replacing both O2 sensors in back, d'oh). And, just as in your case, I needed to pass an imminent emissions test.
AudiWorld Senior Member
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Some pictures for your enjoyment:
This little guy is probably the problem (at least it was for me):
<img src="http://i255.photobucket.com/albums/hh156/ricoblanco/Vacuumlines2.jpg">
It's the black hose (from EVAP purge valve) next to a little black elbow connecting from an orange plastic vacuum line (from fuel pressure regulator) to the intake manifold (near throttle body). Granted, this photo is from a '98 ABZ engine, but it should be similar. Make sure it's connected to the intake manifold.
This image is the EVAP purge valve (next to air filter box) with the red arrow pointing out the vacuum line connected to it (there is one on the other end of valve going to intake):
<img src="http://i255.photobucket.com/albums/hh156/ricoblanco/EVAPpurge-1.jpg">
And finally, I pointed out some easily accessible vacuum lines on the front of the engine. Probably not the culprits, but doesn't hurt to look (*sigh*, my one lonely change over valve). The EVAP vacuum line (leading to leak detection pump) is pointed out with the blue arrow. Just look at all the rust. We love our salt in the winter!
<img src="http://i255.photobucket.com/albums/hh156/ricoblanco/Vacuumlines-2.jpg">
If all else fails, use some leak detection spray (Audi P/N Engine leak detection spray G 001 800 A1). I hope this solves the problem for you!
<img src="http://i255.photobucket.com/albums/hh156/ricoblanco/Vacuumlines2.jpg">
It's the black hose (from EVAP purge valve) next to a little black elbow connecting from an orange plastic vacuum line (from fuel pressure regulator) to the intake manifold (near throttle body). Granted, this photo is from a '98 ABZ engine, but it should be similar. Make sure it's connected to the intake manifold.
This image is the EVAP purge valve (next to air filter box) with the red arrow pointing out the vacuum line connected to it (there is one on the other end of valve going to intake):
<img src="http://i255.photobucket.com/albums/hh156/ricoblanco/EVAPpurge-1.jpg">
And finally, I pointed out some easily accessible vacuum lines on the front of the engine. Probably not the culprits, but doesn't hurt to look (*sigh*, my one lonely change over valve). The EVAP vacuum line (leading to leak detection pump) is pointed out with the blue arrow. Just look at all the rust. We love our salt in the winter!
<img src="http://i255.photobucket.com/albums/hh156/ricoblanco/Vacuumlines-2.jpg">
If all else fails, use some leak detection spray (Audi P/N Engine leak detection spray G 001 800 A1). I hope this solves the problem for you!
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Re: Some pictures for your enjoyment:
HEY RICO, THANKS JUST TO REPORT BACK. I REPLACED THE HOSE NEAR THE WASHER FLUID (LOOKED RUSTED AT THE CLAMPS) AND CLIPPED A COUPLE OF THE SMALLER ONES AT THE ATTACH POINTS AND NOW I'M ONLY GETTING 2 OF THE CODES, BUT ITS THE INCORRECT FLOW AND SMALL LEAK. THOUGHT IT WIERD THE O2 AND MASS AIR FLOW CLEARED ON THEIR OWN AFTER I REPLACED THE LINES. I CLEARED THEM ON VAG NOW AND WAITING TO SEE IF THEY COME BACK OR NOT SO I CAN PASS THE INSPECT.
AGAIN THANKS FOR YOUR HELP COULD'NT HAVE GOT THIS FAR WITHOUT IT.
AGAIN THANKS FOR YOUR HELP COULD'NT HAVE GOT THIS FAR WITHOUT IT.
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