I don't think AutoZone does a 95 E420, only OBDII, 1996 and later. You can either build the code reader (see archives) or perhaps pull it yourself with the built in LED (also see archives). Your car should be a 38 pin connector which does not have the built in LED but some 124/119s have an ancillary 8 pole connector which does have the LED for CE codes. But it's not that hard to build the code reader, and it's a very handy thing to have. But you've got to make sure you build it for the 38 pin and not the 16 pin - different diameter pins.