99 A6 Quattro.
CEL comes on for few days then goes away and back again.
I got the following codes:
01- Engine:
1. 16716- Knock Sensor 2 (G66) signal too low...
P0332 - 35-00
2. 16825 - EVAP Emission control system :incorrect purge flow
P0441 - 35-10
3. 16500 - Engine coolant Temp: circ range/performance
P0116 - 35-10

02- Auto Trans:
1. 00526 - Brake light switch -F: Implausible signal
27-00
My questions are:
1. do I replace the sensor or something else. what does it exactly means.
2. would replacing the purge valve correct this code or do I need to check for something else.
3. engine coolant temp sensor needs to be replaced?
4. I believe my brake lights are working fine. what does that code mean then?.
any help would be very much appreciated.
please be very generous with your explanations. I'm no car technician. but I replaced few things in my car. thanx.

 

did I post this in the wrong forum?!. hmmm.[X(]

 

2. 16825 - EVAP Emission control system :incorrect purge flow
P0441 - 35-10
an air leak check all the pipes for leaks yo the EVAP purge valve

edit: speller checking[:@]to the not yo the

 

all the codes make it one thing and that's the EVAP system and all the codes coincide to one item, codes are only a guide it takes expertise to determine the fault and im not the best