Camshaft sensor on Audi a3 keeps breaking had two

Not all fault codes are genuine , you are best to hook car up to an OBD2 reader and clear codes first , if code re-appears investigate further , some codes are ghost codes or old codes stored

100 is the MAF sensor. 343 is the cam sensor. It need s to put on a scanner. I read numbers. Maf could be it, not likely. most likely you need a timing set.

still under warranty , take it back to the dealer and say that you want code 1601 fixed properly, a code that they should have found if they followed the trouble shooting procedure properly
could be a bad ground connection or faulty wiring

Check bearing and joint/knuckle on every wheel and even on the drive shafts, if there is lack/knocking, that could cause abs and esp light, because sensor doesnt give right information and ecu only records sensor fault but doesnt say why the infromation is wrong.
They changed the sensor but didnt solve the cause!!!

ITS GOT A CHAIN DRIVE......needs changing at 150k with tensioner.

the problem is in the voltage regulator
IT is probably in the ECM which will require an ECM replacement
get it to an accredited auto electrician for a full check of the charge system to eliminate all faults , fires etc

The "cam crank" sensor is the "reader" for position and speed of the camshaft. This sensor send informations to Engine Control Unit about camshaft position and speed. If the sensor is faulty engine stops!

I had the exact same problem. The check engine light would come on then go off. I didn't notice any drivabiltiy issues. End the end I had to replace the flapper motor, the high pressure fuel pump and the camshaft. They showed me the old parts and sure enough the camshaft lobe was worn down and the cam follower that actuates the fuel pump was in pieces. Needless to say it was very expensive. It's been a problem posted on many Audi sites. I went ahead and had the timing belt changed. Now she's as good as new.

My Nissan micro 2004 model just stopped in the middle of the road one day then the engine management light came on, anyway took it to my local garage TWK Thomas who said it was a cam shaft sensor problem. OK so sensor was put on, engine management light went off for two days only. So went back to the garage they said that another sensor should be fitted on the opposite side. And then the problem should be rectified, but i had given the £160 for this problem to be fixed the first time. I decided it was time to take it to another garage Nis Tec they put it on the computer and a code po340 came up would this mean another sensor or the cam chain has stretched please help. ...claire

Do you know if the engine timing is correct? If you get the timing a tooth out you very similar issues, has the cambelt been replaced recently - or is it over due??
Another posibility is the cam chain adjuster. This is oil pressure fed and I think controled by a solnoid, it applies a force between the chain that drives the inlet camshaft from the cambelt driven exhaust camshaft. (Making any sense? Let me know if you want me to simplify) This operating correctly advances and retards the valve timing, when faulty it can make it incorrect. Non start is a fault caused, but more often they become very noisey.
The cam chain adjuster is fed oil when the car is started, you can breifly here it before it has reached operating pressure on normal start up, sounds like a diesel knock for a second, then goes, this is normal. If it continues, its more than likely faulty.
Let me know if you want any more info. If the sensor and wiring is good you'll probably have a timing issue.