brittcrowell

So on the Way to the movies last night (25mile drive!) Got a CEL on the '97 A8
Pulled the engine codes and got this.

4 Faults Found:
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent

18020 - Engine Control Module Incorrectly Coded
P1612 - 35-10 - - - Intermittent

17546 - Fuel Trim: Bank 2 (Add): System too Lean
P1138 - 35-10 - - - Intermittent

17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-10 - - - Intermittent


I just replaced the batt a few weeks ago I guess thats where the first one came from.

So what could be causing these Errors?

Thanks
Britt

icsamerica

Save them, Clear them and see what comes back.

brittcrowell

Seems the lean bank condition is always there.
Britt

skiracer

This can cause the lean codes you're seeing. It could also be the MAF itself- they do go bad over time.

brittcrowell

quick stop the car will die. Is that related in anyway?

Britt

skiracer

with your intake/fuel injection system. I would start by running a full tank of gas with 2 large bottles of Techron in it to clean the injectors, and also check for air leaks in the intake- check all the hose clamps and other fittings for leaks. Then I'd have the MAF checked out. There are several sensors that could be out of spec as well and not throw codes.

dimitristx

Had the last 2 codes and were due to two areas: 2nd-ary air pump and MAF

Always Overcharged

even with older type cars.
I had the same with an old 1953 Desoto years ago.
The carb bowl worked loose.
Also scan the o2 sensors to see they are working efficiently.

brittcrowell

I can do the checking myself.
I did save a few min of driving last night with VAG com. Anyone care to take a look at the xls file?<ul><li><a href="http://www.brittcrowell.com/a8/a8vag.xls">XLS of VAGCOM driving - 63kB .xls</a></li></ul>

Always Overcharged

Mass air flow seems a little high as to spec -have sent you a sheet