I can not get thru emissions in CT. I clear this code and it returns on startup. I have disconnected batt pos cable, checked ECU connections under pass side front carpet. I have searched this forum thoughroughly for correcting/eliminating this code permanently. Thanks in advance for any assistancce with this nightmare. geno

 

Clear the cel, leave the bat disconnected over night... then see if that helps?
have you checked the charge on the battery?

 

OC, thank you for the response. My son and I are going to disconnect batt now(8:40p EST) for the night. FYI-p1602 codes only appear when motor running, CEL is NOT on-does this make sense?

 

For a 1996 A6 Audi with the 2.8L AFC engine, P1602 is power supply (B+) terminal 30 low voltage, per Bentley. To test, connect the V.A.G. 1527 voltage test lamp to the ECM socket B10 (continuous B+) and to engine ground.
You may need the BentleyPublishers.com Audi shop manual CD, since it has the wiring diagrams. You may get the CD from www.themotorbookstore.com or www.themotorbookguy.com .

 

OC,
OK, it's 11:50p EST, we reconnected both pos and neg terms to batt. With key at on position for 10 min's, we waited then off-then started Audi. P1602 was still on Actron scanner. Shut off, restarted and p1602 still there. I do appreciate your response and suggestion.
geno

 

a6hcw,
Thank you. My mechanic friend, I believe has VAG sys and presumably VAG 1527 test lamp, I will ask he test ECM socket B 10. Is the "ECM" the module/metal box my son and I found under the pass front carpet/plastic shield?? Thank you.

 

OC,
One other follow-up to your post, the batt is a VW/Audi type appears new, but I will check standing voltage, running voltage and volt off alternator in AM. My dash volt gauge has always shown better than 12 and under 16 for past 2 years. Thanks again.