I just bought an automatic 2000 Volvo C70 convertible. The car is great, but the check engine light is on because of an evap large leak, and the transmission light randomly flashes while i’m driving. It doesn’t affect performance until I come to a stop. When I try to step on the gas the car won’t shift pass 1st gear until i hit 3000+ or so RPM. I plugged my OBD2 in and got 3 codes. P1633,P1618,P1455


I’ve done all the research on P1618 since that is the root of the transmission light, and i have found various causes. The one that stuck out the most was someone with a similar issue saying they changed their PNP Switch and the code / performance issues went away. Has anyone here been in a similar situation? What do you recommend I get done?