[A8] Check engine light

Rich, Jack Jack.Rich at kronos.com
Fri Oct 5 14:02:32 PDT 2007

"Why not have some real activity?" I said to myself.

My A8 has had the check engine light on for most of the year due to an
evap system leak, which was traced to a leaky pump that is used to
pressurize the system to test for leaks.  How's that for irony?  I lived
with it until it was time for the state inspection, so I had it fixed.
They immediately discovered another code saying the mass airflow meter
was bad, and had to replace the mass airflow meter, and I got my car
back with an inspection sticker.

One day later the check engine light was on again, but lo!  It was not a
you-just-wasted-money-on-a-new-airflow-meter code.  I have the following
5 codes, which I cleared.  The check engine light came back on shortly
thereafter, but I have not re-checked the codes.  My codes are:
17549 - load calculation cross check: implausible value
	P1141 - 35-10 - - - Intermittent
18010 - power supply terminal 30: voltage too low
	P1602 - 35-10 - - - Intermittent
17521 - Oxygen (Lambda) sensor: B1 S1: Internal resistance too high
	P1113 - 35-10 - - - Intermittent
16826 - EVAP emission control sys: small leak
	P0442 - 35-10 - - - Intermittent
16839 - EVAP system: large leak detected
	P0455 - 35-00 - - - 
The latter two codes are what I was getting way back when prior to
diagnosing the leaky pump.

Any ideas?

Jack Rich
Senior Member of Technical Staff
Improving the Performance of People and Business(tm)

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