I am in need of advice!!! My wrx had been driving fine until recently. Suddenly while I was driving the car, it bogged down and refused to go. I couldn't give it gas to go but the car was still running. I reset the car and it worked ok for a bit and then did it again.

I took it to a dealership and it came up with a code no one recognized. PO1544. Apparently it has to do with the exhaust temperature being too high. Does anyone know what I should do to fix this? Every dealer is telling me different things...from replace the sensor, replace the cat, take off the aftermarket exhaust, etc.

Please help!!!