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Posted on Mar 13, 2011
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My 2002 Audi A6 with 3.0 has the following codes diagnostic codes: 16408 =Camshaft Position Actuator B Bank 2, Timing Over-Advanced 16684 =Random/Multiple Cylinder Misfire Detected 16689 = Cylinder 5, Misfire Detected 16805 =Warm Up Catalyst Bank-1, Efficiency Below Threshold 16815 = Warm Up Catalyst Bank-2, Efficiency Below Threshold I think the catalyst errors may be caused by the misfires sending unburned fuel into the exhaust. The previous owner had recently changed the timing belt and the car ran good when I bought it. I think the problems may be related to the camshaft actuator or the cam sensors. Just my 2-cents. Any help appreciated.

  • zaj7 Mar 20, 2011

    This 3.0 engine does not have the timing chains and the camshaft actuator like the previous V6's so the advice by the first "expert"doesn't apply.

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2 Answers

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  • Master 1,874 Answers
  • Posted on Mar 13, 2011
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1. Check and replace if necessary the Camshaft Position Actuator B Bank 2. Bank 2 is the left side cylinder block bank, (driver's side for LHD vehicles). Also see if the variable camshaft mechanism movement is all right, and nothing can block it. The codes 16408 and 16684 must be eliminated definitely!
2. Then test the engine. If the code 16689 = Cylinder 5 - misfire detected, still occurs, check the spark plug, ignition coil and injector. Replace bad piece(s). The code 16689 must be eliminated definitely!
3. The codes 16805 = Warm Up Catalyst Bank-1, Efficiency Below Threshold, and 16815 = Warm Up Catalyst Bank-2, Efficiency Below Threshold, are caused by the misfires sending unburned fuel into the exhaust, and will be erased from Engine Control Module memory.

Test the car and send me back if everything is OK, or if any DTC code still remains.
Good Luck!

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  • Master 1,796 Answers
  • Posted on Mar 20, 2011
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Hi!!
I believe you're right about the 4 codes below are due to the rich mixture or unburnt fuel.

16684 =Random/Multiple Cylinder Misfire Detected 16689 = Cylinder 5, Misfire Detected 16805 =Warm Up Catalyst Bank-1, Efficiency Below Threshold 16815 = Warm Up Catalyst Bank-2, Efficiency Below Threshold
The code 16408 =Camshaft Position Actuator B Bank 2, Timing Over-Advanced. Could be due to the timing being set wrong or the CMP Sensor being defective.
Click on the following link for detail instructions to test the Camshaft Position Sensor. Note that there are two sensors, one for each bank. Bank #1 is on the side of the vehicle where the #1 cylinder is. Bank #2 is the other side. http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c152801c0e97
Good Luck! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

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