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Q:Is this a replacement for Bank1 Sensor3?
A:I'm happy to help, Michael! This Bosch Oxygen Sensor (Part No. 16978) is the upstream sensor for a 2004 Volkswagen Jetta GL 2.0L L4. This information is located under the Product Application(s) heading in the Description tab when the vehicle information is entered into the website.
Q:I HAVE THE LATER 1999 CABRIO 2.0. WHICH IS APPERENTLY DIFFERENT THAN THE EARLIER 1999 CABRIO. WILL THIS SENSOR FIT?
A:I'd be happy to help you with that! This sensor is not a fit for a 1999 model. I checked the sensors for the 1999 model and none state whether they are specific to an earlier or later model in the year. This sensor does fit the 2000 model, but I am not able to guarantee a fit for a 1999. If there is a difference between the earlier and later manufacturing dates for the parts to fit, our catalog usually states the difference. I would recommend the one for the 1999 year since you have a 1999 model. If you have doubts, I would recommend checking with a VW dealership. If you can get the OEM part number, we can cross reference it for you.
Q:is this before or after the cat.
A:Hi justin, I'm glad to assist you! This is a downstream oxygen sensor, downstream is after the catalytic converter.