O.K. , i was kind of bored , had been raining . decided to check RPO codes . i have 3 that did not show on the decoder i downloaded . anyone know what E7Z , 1AA , or 1AZ mean ? thanks in advance .

Im pretty sure 1AZ means that the customer special ordered it.
E7Z = Key,Speedometer (Delete)
1AA= retail amenities delete (usually shows up on B4C'S or fleet cars)

I just searched on here and found them. Im sure the mods will tell you what they mean exactly.

Here's what I got:

E7Z : VEHICLE SPEED SENSOR DELETE

1AA : ?

1AZ : Order Modification, Orders Sold (or: CUSTOMER ORDERED VEHICLE)