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Heater control circuit is your O2/oxygen sensor which controls your emissions and keeps the car running efficiently. They go out quite frequently and need to be replaced. Wont cause any drivability issues other then lower fuel economy and check engine light. Sensors run between $50-$200 each.
if you erease the codes the issues will still remain and the light will come back on once the ecu redetectes the issue i would just suggest writting the codes down and erease them all now once the problems are repaired the light will shut off withing 100 miles of driving .
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The code that tells why it died is the P0068 the throttle position sender. It can be bad but they usally last a long time. Other sensers can have troble and pull down the 5 volt reference signal and it'll make it appear that the senser is bad. You can pump the gas very quickly many times and make even a good car set this code. The computer sees a smooth signal from the senser it'll set things back to normal and it'll run just fine. The senser can be teated with an OHM meter center pin of the serser to one or the other outside termial. with the meter making a good conection. the senser should make a smottth change up and down and return to the same value as you started and never go off scale, the other terminal should do the same thing but only in the opasit direction. If it doesn't its bad but a new one stick in on fire it up and run down to the store and have them erease codes telling them you replaced the bad part and need to reset. Even then they sometimes won't do it as some stores have run into troblem with the wrong customer and they don't reset codes anymore. Then you'll have to go to a shop the has a code reader or a scanner to reset the light and or buy your own but about $80 is the cheapest you'll see for a reader that will reset (erease cdes) on OBDII vehicals. good luck
best way to reset the code is unplug the battery for 120 sec then plug it back on. HOWEVER here is the problems with V.W there battery are not normal, they need more then the normal 12volts. I would make sure that they gave you the right battery.. Passat need i think 14.9 volts. if the battery is showing only 12 volts the cars computer will think somthing is wrong.
try reseting it first then if that dose not help you can take the car to autoZone and have then run an obd2 test on it..
Trees problems can do that maybe a vacuum leak or a trottle position sensor problem have the car diagnoticated witch a scan toll or a code reader if you have a code on it that will be indicated on the tollre pair the problem and get the code ereased.IFyour rpm does that when the engine is at the idle without car moving that is your idle air control valve problem (probaly dirty) removed it and clean the plunger witch a solvant but dont push on the plunger this one is very sensitive and is preset at the factoryand reinstall it but before unplunging any electrical obd sensor on your engine you have to unplug your negative battery post from it if you dont do that you will put a code in your engine computer