mekyjesy

Hello,
I am needing assistance on my 2003 3.0 A6, 160,000 miles, with multiple CEL codes I keep getting.
P0346-Camshaft position sensor A
P0300-Random multiple cylinder misfire
P0301-Cylinder 1 misfire
P0302-Cylinder 2 misfire
P0303-Cylinder 3 misfire
P0304-Cylinder 4 misfire
P0305-Cylinder 5 misfire
P0306-Cylinder 6 misfire
P0171-System lean bank 1
P0174-System lean bank 2
P0102-VAF/MAF low input
P0492-Secondary air system bank 2
P0491-Secondary air system bank 1
The car idles rough and dies occasionally at idle, then becomes difficult to start.
I know this is a lot of codes at once, but what can I do to fix this. What needs replaced, and where are these defective pieces located?
Thank you for your help

SloopJohnB@mac.com

What did you do the last time you did something to the car/engine or had something done to it? Think back...it's unusual to have so many codes unless a connector got damaged or a ground lost or a sensor went out. Sensor going out might not be the result øf a maintenance-induced failure, but the others often are.

Peter Badore

I worked on a 3.0l V6 with these codes. The engine had bent valves in every cylinder due to a skipped timing belt from seized water pump at 145,000 miles.

SloopJohnB@mac.com

A compression or leakdown test will confirm whether the engine has damaged/bent valves from a skipped timing belt. You could also use the timing plug into the crankshaft/TDC and check the cams for correct timing visually...a skipped tooth is easily identified.