My car is still getting a 2413 error code every now and then... HELP!!!! UPDATE, but still no fix!

[Brett Dikeman]

At 11:19 PM -0400 10/4/01, Levent Cur wrote:

>             My 1995 S6 is still having a problem with the error code 
>2413, meaning that it is running rich! I changed the O2 sensor with 
>a brand new audi one about 200 miles ago, the exhaust smells real 
>bad like rotten eggs cause of the rich fuel mixture

Ooo..sudden thought.  Check the "plumbing" to the fuel pressure 
regulator...maybe even replace the vacuum line.

My guess is that there's a leak or it's popped off, so the FPR is 
keeping fuel pressure higher than it should be(ie, for atmospheric 
pressure in the manifold) instead of low for idle/low loads.  It's 
possible that the ECU's idle adaptation adjusted enough after a bit, 
so that the car is fine at idle and doesn't throw the code.  I'm 
assuming that when you pulled the car into the garage, you didn't get 
any boost :-)

It a little bit of a long shot, but I can't think of anything else 
that would cause rich running, except maybe a malfunctioning MAF 
sensor, that might fool the ECU into thinking there was a lot more 
air coming in than there actually was...but that doesn't seem very 
likely...

Brett
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Brett Dikeman
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http://www.users.cloud9.net/~brett/
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