2008 mustang convertable P0442
 

Hi I have the v6 pny package right so a month ago my tranny went after 160 000 klm so they rebuilt it and 5 times after my engine light came on p0442 emission code,after the first 3 times aa week after they scanned it so I thought ok ll pay 50 bucks for a new cap well 3 days later it came on same code they cleared it again for the fourth time then today on it came same code now heres my question,,,,,,they took the tranny out ever sine then light came on?do they take theexaust off before pulling the tranny?