Can you please help me with my Diagnostic CODES: BMW 328I

Hi.. i have my bmw 96 328I, i have a snap on diagnostic machine. I dont know what they mean.... can you help me??


P0420 Catalyst efficiency low bank #1
p0455 Evap System Leak <Large>
p1423 Undocumented Code
p1421 undocumented Code

can you please tell me what they mean. and also help me how to repair it. Thank you

Have you searched on the net about it? is there an instruction manual?

no i have not... where can i find??

Here's a list on this link:

http://www.obd-technologies.com/DTCCodes/BMW.php