Check Engine Light - DTC None

Does the trouble code display sequence using the trip odometer necessarily display all registered fault codes?
The "Check Engine" light is on in my 2001 SE wagon. The diagnostic
display flashes "Dtc" / "none" and yet the amber light has been on for weeks now. The only trouble I have had is with the speed sensor, but it hasn't acted up for quite some time. I always tighten my fuel filler cap so I'm sure it's not that.
Will a proper OBD II code reader be able to tell me more than the dashboard display? Does anyone really know what all the things mean in the diagnostic sequence? While it's fun to make the gauges whirl around, I haven't gotten much use out of that feature.
-S
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No. It displays a limited number of codes.
<Snip>

Probably yes.
<http://www.dealz4all.com/product_info.php?products_id@&osCsid 28f24e 752664993c5db4b9ad14decf>
The above just plugs into the OBD port. It then reports the error code 4 times. On the 5th read it also clears the engine light but you can disconnect it before then until you fix the fault indicated by the code. (Obviously, if you don't fix the fault the light will come on again)
If you live in the USA it appears that some independent car service outlets may read the code for you for free. You can the look up the reason for the reported code at
<http://www.obd-codes.com/trouble_codes/ford/index.php
<http://www.obd-codes.com/trouble_codes/index.php

The odometer sequence is explained at <http://www.mustangworld.com/ourpics/fcar/dtcodes.htm
--
Alan
mailto:news2me_a snipped-for-privacy@amacleod.clara.co.uk
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Thanks for the links. Also it's good to know there are cheaper OBD II code readers than the 200 $CDN ones I've seen.
I found the instrument cluster test sequence a little different from the Mustang's. I typed out a dump of my codes with my best guess at interpreting them. If anyone can correct or fill in the blanks, please do.
Seq #    Disp.    Description 1    tESt    Start of Sequence 2    gAgE    Gauge Test 3    888.8    All LCD Segments 4    bulb    Bulb Test 5    r 22    ROM Version 6    E001    EEPROM Level
7    dtc    DTC Codes (flashes "NONE" if none logged)
8    000.0    Speed (mph) 9    000.0    Speed (km/h) 10    057.o    Something about the odometer? 11    0000    Engine Speed (rpm) 12    039.t    Something about the tachometer? 13    F183    Fuel Level (just over 3/4 full) 14    L190    Oil Pressure (Engine off >176) 15    0E5.F    ???? 16    022C    Engine Temperature (C) 17    04E.C    ???? 18    b12.0    Battery Voltage (12V)
19    Ab-H    ? 20    Eb-H    ? 21    IL-L    ?
22    Cr-H    Run/Start mode high (key in position 2)
23    A-6d    ? 24    b-98    ? 25    C-d1    ? 26    d-36    ? 27    0152    ? 28    1255    ? 29    2255    ? 30    3255    ? 31    4183    ? 32    5000    ? 33    6000    ? 34    7000    ? 35    P106    ? 36    P200    ? 37    P300    ? 38    P400    ?
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Steved wrote:

I had this with my 2001 SE wagon as well. It turned out to be the DPFE, a $40 part from Ford.
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