2002 Saturn VUE. Just had catalytic converter and 02 sensor replaced 10/4. Now car does not want to go when in drive,will only move in low. Worse after stopping for light. This does not happen all the time occasionally. Was told it was a transmisson problem and no one wants to touch it since it is a complicated engine. Is there anything else that it could be.

Question edited for clarity.
Question moved to model category.

As a general rule, with a laterally positioned V6 , Bank 1 is always closest to the firewall Bank 2 is closest to the headlights.

Sensor 1 is ALWAYS the one in the Exhaust Manifold, and Sensor 2 is ALWAYS the one AFTER the Catalytic converter.

confirmed here

02 sensor "bank 1 sensor 1" - Saturn Vue

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upstream is before the catalytic converter - most time on the exhaust manifold
downstream is usually in the cat or after

Is it a 4 cylinder engine with automatic? Could be that cvt transmission. They are problematic. Or could be a partially plugged catalytic converter in your exhaust.

need to replace converter

Could quite possibly due to a damaged or otherwise worn out catalytic converter.

having PO 304 = Misfire cylinder 4,PO 306 = Misfire cylinder 6, as I read above you have done the most. The thing that you have missed is to check whether the Catalytic Converter is faulty or not. To get an idea check whether you have a smell like rotten eggs at the end of the exhaust,you start having problems with cat and needs replacement. My advice before you go for a cat replacement is good to visit an MOT center and check your emissions and then you decide,

First I would check the air filter, if it's real dirty replace it. To check and see if it is the filter. remove it and drive the car. it your problem stops. replace it, you don't want to drive without it for to long. If it persists, try cleaning the throttle body and mass air flow sensor. And if it still persists, have the catalytic converters checked. All of these things are pointing to air reduction for the engine. if there isn't enough air flow threw the engine it starts with the symptoms you have now and gets progressively worse.

It is pointing to a bad catilatic converter, as well as possibly, 02 sensor. Hope this help you, thanks. Mike from fixya

I think you are looking for an O2 (oxygen) sensor. It looks sort of like a spark plug, but it has a low voltage wire permanently attached to it, often with a latching-type connector with a few inches. It's mounted on the exhaust pipe between the manifold and the catalytic converter, or right on the exhaust manifold. Some models have another one at the outlet of the catalytic converter.

When I need to replace one, I soak the threads with Liquid Wrench the day before, and I take the car for a drive to heat up the Liquid Wrench (your regular commute or an errand run will do the trick). When I return, I add some more Liquid Wrench. The old sensor generally comes out without a lot of trouble with this treatment. The hardest part may be getting a wrench (metric) on it with enough space to turn. Before you remove the sensor, study the connector to see how the plastic latch unlocks. If you use an after-market replacement designed to splice into the original wire, be sure to use a crimp-type splice rated for high temperature environments. "Twist and tape" is not reliable enough for this task.

yes egr valve is a common thing on this saturn. very pricy and yes you need the rear o2 sensor good luck i have a used egr if interested off a sl2