I've read all the previous threads about accessing the dealer menu, but no one seemed to get to in on 04-08 Lariats. Today, I got to it on my 05 King Ranch by holding the Reset and the Setup buttons when you turn the key to the Run position. From searching the threads, I don't how many people are aware of this menu on our trucks. My question about it is, one of the tests says diagnostic codes, and says none. If I had a check engine light, would it give me the error code for the problem?

If I completely missed the thread about this, I apologize now.

 

If the light stays on long enough the code should be stored.
Codes store for a short time after the light goes out.

 

i don't see why not. The easiest way to find out would be to unplug a sensor. Say coolant temp or level. Then post your findings.... I wont be near my truck for 6 days.

 

That is only for some codes, not all. It is not a replacement for an OBDII scanner.

It's actually more for the data sent to the cluster... if the fuel level indicator decided to die or get unplugged, it would not only display a "B" code, but a "P" code as well. "B" codes are what Ford considers Body Codes/Chassis Codes. "P" codes are power train codes, such as engine codes...

Say if the antitheft system got screwed up, it'd throw a "B" code, which is more than likely readable without a scantool and right on the cluster. However, mind you, the cluster might not show all codes.

Also, some scan tools won't allow you to read "B" codes, you'll need to get a more expensive scanner, like a Snapon Diagnostic CANBUS/OBDI/II scanner.

One final note: The PCM does not permanently store codes! Once you acknowledge or reset them with a scantool, or unplug the battery, they are lost forever! So if you unplug every sensor in your engine and you get it to start, you will rack up a list of P and possibly B codes. Reconnect everything, and acknowledge all the codes, and they are lost forever.

B1202 9202 Fuel Sender Open Circuit
B1204 9204 Fuel Sender Short to Ground
B1213 9213 Anti-Theft Number of Programmed Keys is Below Minimum
B2103 9232 Antenna Not Connected - Defective Transceiver
B1232 A103 Antenna Not Connected - Defective Transceiver
B1317 9317 Battery Voltage High
B1318 9318 Battery Voltage Low
B1342 9342 ECU Is Defective
B1356 9356 Ignition Run Circuit Open
B1364 9364 Ignition Start Circuit Open
B1600 9600 PATS Ignition Key Transponder Signal is Not Received - Damaged Key or Non -PATS Key
B1601 9601 PATS Received Incorrect Key-Code from Ignition Key Transponder (Unprogrammed Key)
B1602 9602 PATS Received Invalid Format of Key-Code From Ignition Key Transponder (Partial Key Read)
B1681 9681 PATS Transceiver Signal is Not Received (Not Connected, Damaged, or Wiring)
B2139 A139 PCM ID Does Not Match Between Instrument Cluster and PCM
B2141 A141 NVM Configuration Failure (No PCM ID Exchange Between Instrument Cluster and PCM)
B2143 A143 NVM Memory Failure
C1284 5284 Oil Pressure Switch Failure
U1027 D027 SCP Invalid or Missing Data for Engine RPM
U1043 D043 SCP Invalid or Missing Data for Traction Control
U1073 D073 SCP Invalid or Missing Data for Engine Coolant
U1123 D123 SCP Invalid or Missing Data for Odometer
U1147 D147 SCP Invalid or Missing Data for Vehicle Security
U1262 D262 Missing SCP Message

 

I think the answer is yes...