I had a check-engine light on, and people here suggested that I get the
problem code read from the car's ecu as soon as possible.

So I went to my trusty mechanic who said that his computer can give a
"general industry standard reading" of the code, but that it might take Audi
to get something more specific.

Here's what came back:

Code: P4011, "secondary air inj flow at wrong rate".

He said that this is not a drop-dead critical error. So he said to try
this: He turned /OFF/ the engine lite via the computer interface (nullified
the error code) and said that if it comes back in the next day or so, then
it's still there as an issue.

Is that really a good idea?

Does clearing the error code (and thereby turning off the check-engine lite)
allow the code to come back if still a problem, or does this PERMANENTLY
stomp on the error???

TIA

 

"Thomas G. Marshall" wrote

> Code: P4011, "secondary air inj flow at wrong rate".

Isn't it P0411 by any chance?

The P0411 cross-references to VAG DTC 16795 "Sec.Air Inj.Sys. Incorrect
Flow Detected"

You may want to do a search on 16795 at http://www.audiworld.com/search/

Lots of interesting info.


> He turned /OFF/ the engine lite via the computer interface (nullified
> the error code) and said that if it comes back in the next day or so,
then
> it's still there as an issue.
>
> Is that really a good idea?

Well, he's basically right. If the problem still exisits, it'll throw
another error code making your check engine light come on again.

Cheers,

Pete

 

Pete <escape2music@hotmail.com> coughed up the following:

> "Thomas G. Marshall" wrote
>
>> Code: P4011, "secondary air inj flow at wrong rate".
>
> Isn't it P0411 by any chance?
>
> The P0411 cross-references to VAG DTC 16795 "Sec.Air Inj.Sys.
> Incorrect Flow Detected"

Yeah, well, I apologize for not being more careful when typing the OP.


> You may want to do a search on 16795 at
> http://www.audiworld.com/search/
>
> Lots of interesting info.

Holy crap, that's a great resource! Thanks!


>> He turned /OFF/ the engine lite via the computer interface (nullified
>> the error code) and said that if it comes back in the next day or
>> so, then it's still there as an issue.
>>
>> Is that really a good idea?
>
> Well, he's basically right. If the problem still exisits, it'll throw
> another error code making your check engine light come on again.

Well that puts me at ease. I was tormented by the notion that /maybe/ audi
error codes get permenantly (somehow) stomped on.

BTW, it didn't come back on and it's 24 hours later (maybe 2 hours total
driving since, maybe 12 engine starts).