Honda civic 2004 is that a evap system or
SOURCE: 1995 honda civic dx
Look on the wiring harness it plugs in on top of the transmission
make sure all the wires are together. If every thing is ok with the wiring, The sensor is the only thing it could be. A gook used spedometer sensor from the junk yard will work this sensor dosent take a lot of abuse so a good used one will be cheap and work just fine. This is a job you can do your self and save a lot of money. I had the same problem with my 95 civic
SOURCE: what is the code?
Most hondas have the code on the vehicle itself for resetting the code once the battery has been disconected or radio removed. Try pulling the glove box out and looking on the inside of the cavity. You should not need a code to remove the radio the alarm should not go off, it is the installation. The radio will not work with any other --vehicle without your specific code, good thieves know this and would rather steal the whole car. "Especially the Honda Accord. Have one in the garage and a 2005 Pilot.
SOURCE: I have a Honda 2004 CRV - the repair ( OBD II)
P2647
VTEC Oil Pressure Switch Circuit High Voltage - With Automatic Transmission
Basicallly the sensor has gone bad or an oil passage has become blocked.
**. Locate the Variable Timing Electronic Control (VTEC) pressure switch on the end of the cylinder head. Honda has had problems with the VTEC oil pressure switch, there is an updated part number for the vehicle (37250-PNE-G01). On this vehicle the VTEC oil pressure switch can fail at any RPM.
2. The VTEC oil switch is normally closed, and grounds the reference voltage from the Engine Control Module (ECM) on the Blue/Black (BLU/BLK) wire. If the code sets at idle - 2500 RPM - and the Brown/Yellow wire has a good ground, then suspect a faulty VTEC oil pressure switch.
3. At approximately 2500-4000 RPM and when driving the vehicle, the VTEC system should turn on. To turn on the system, the ECM energizes the VTEC Solenoid valve and it allows oil pressure into the intake valve rocker arms, the oil pressure opens the VTEC oil pressure switch so the Engine Control Module (ECM) can verify that the VTEC did turn on correctly.
4. The code will set at idle to 2500 RPM if the reference voltage is not grounded. The code will set above 2500-4000 RPM if the VTEC oil switch does not open.
5. If the code sets at 2500-4000 RPM or higher, the problem can be a low oil level or pressure, or a malfunction in the VTEC assembly.
Potential Causes:
Low Engine Oil
Plugged Oil Passage
Insufficient Oil Pressure
Plugged Oil Screen
Insufficient Oil Volume
Malfunctioning VTEC Oil Pressure Switch
Defective VTEC Solenoid
SOURCE: i have a 2000 honda
right off all data
p1399 is a random misfire code and honda has reported for various models
that this could be caused by clogged egr ports, in addition there is
the possibility that the valve clearance spec may be out of range.check plugs and wires first and proper gap.
SOURCE: where is obd II port in 2003 honda civic
It is under the dash on the drivers side, get under there and look, you will see it. Here is a picture of a typical OBD 2 connector plug.
http://engine-codes.com/p1457_honda.htmlForum CodePossible causes- Missing Fuel caphttp://engine-codes.com/p0107_honda.htmlForum CodePossible causes- Manifold Absolute Pressure harness is open or shorted 
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