I followed this process and came up with this, this is my experience so far, any ideas??

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HOW TO SET DIAGNOSTIC MODE II (SELF DIAGNOSTIC):

1- Turn ignition to "ON" position and wait 3 seconds
2- Fully depress and release accelerator pedal 5 times in 5 seconds
3- Wait 7 seconds, then fully depress accelerator pedal for approximately 10 seconds until the MIL starts blinking
4- Fully release accelerator pedal (ECU has entered diagnostic mode)

The ECU will blink 10 times to indicate the start. After that, error codes are read by counting the blinks. For example, to read error codes 456 and 458, the ecu will blink 10 times, pause, blink 4 times fast, pause, blink 5 times fast, pause, blink 6 times fast, pause, blink 4 times fast, pause, blink 5 times fast, pause, blink 8 times fast, pause, lather-rinse-repeat.

HOW TO CLEAR THE ECU OF ERROR CODES:

1- Get into diagnostic mode
2- Fully depress pedal for more than 10 seconds and the ECU will only blink 10 times

Before erasing error codes, I would recommend finding out what they are. A 456 is a "very small leak in fuel evap system." I had that and that's usually caused by the gas cap not tightened down enough.

Michael.
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man, the blinking is HARD to follow.

I think I got a #137 and maybe a #139 or 147.

These ALL seem to point to O2 sensors, which is what my dealer said their computor was saying.

here is what I had a problem with-->

my light came on when I bought the car. I told my salesman and he took it to service to have them look at it. They cleared the code and ran it through 2 "cycles" and went on a drive to see if they could get it to come back up (they couldn't). Tis morning when I started it, it came on again . While we were waiting for for the service yesterday, my salesman did a little research and the guy who picked up the car (dealer trade) said the light came on just before he got back (of course he didn't tell anyone). The car was FULL of gas, and I have read that sometimes it is do to NOT tightening the gas cap tight enough (which did happen to me once on my wifes Jetta).The dealer didn't know what it was, so they told me to take it and come back if it happens again (they were very cool about it).

I just went and tightened it and the light still appears, I have heard that it takes a few starts/days for it to go away (til vacuum pressure builds back up in the tank)

any other ideas, is this common???

the dealer said they didn't have the proper tool to even replace the O2 sensor on the Z yet , but would order the parts and tool and I could come back when they came it.