DTC P0546 in 2003 Saab 9-3
 

I live in Chicago and my 2003 Saab failed the emissions test yesterday...the DTC (code) I received from them was P0546.

From all of the research I've done, it looks like this is the exhaust gas temperature sensor......can someone tell me if this is correct? Is this an easy change/fix? How much is the part, etc?

ANY assistance is greatly appreciated, as I need to get this fixed and retested ASAP!!!! Many thanks!!