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I'd like to know what specific faults the system had in it, VWs don't often have O2 sensor problems, and when they do it is usually the heater. More often, O2 faults are caused as a result or some other issue, such as msifiring sooting up the sensor.
When you try to start it, does the Check Engine light come on and then go off when you turn the key to the on position (self check)? And does it do anything when turned to "start", do you even get a "click" from the engine compartment? You are sure the battery is charged?