Replacing brakes will not shut the abs light off. You have either a bad sensor or accumulated dirt on a sensor. There's a sensor for each wheel so you have to either pull a code or visually see which sensor is bad, craced, chiped, etc, then change. As for the CE light, go to auto zone and they'll hook it up and tell you why it's on. You have to use a scanner to find out.
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Before I give you my answer I need to advise you, if you have an aftermarket/performance air intake, it will trip an IAT code pretty often, you will either have to live with it or try to find a "dummy" sensor (a fake IAT sensor designed for cold air intakes that will make your engine computer think the incoming air is a certain temperature) if you dont have an intake:
Chances are if the IAT code is coming up (assuming you do not have a cold air intake system) your IAT sensor is probably bad. There is a very long and tedious process of testing the sensor and the circuit for the sensor, but with the average price of a new IAT sensor being around $12 I pretty much always suggest just replacing the sensor. On your vehicle the IAT is part of the mass air sensor assembly, but can be replaced independanlty, and shouldn't be a very difficult replacement.
Lift the hood and listen to the engine while it's running and see if you can locate where the noise is coming from. Check to see if all your cold air intake connections on the engine are tight and check all your vacuum hoses. Do you have an aftermarket cold air intake on your vehicle? They improve air flow into the intake but may increase intake noise.
Believe it or not, this could be a mass airflow issue. The mass airflow can trigger the lights the ASR and the EPC lights. When i gets really cold, the airflow sensor sends signals to the CPU to readjust the air/fuel mixture.
I recently had a similar problem. I got my car scanned and needed a new catalytic converter. If its already starting to spit and sputter, you probably have 3-6 months to get this done. Mine plugged up one day, and just flat out would not drive anymore. This cost of this repair was about (i recommend changing the spark plugs and wires also) $675....pretty costly. could get a lot more expensive the longer u let it go. Does your jetta run cold, in cold temp? (between 25-40 degrees) if so the thermostat probably took out the converter.