Trouble code P2100 means: Throttle Actuator Control Motor Circuit/Open
P0355 means Ignition Coil E Primary/secondary circuit malfunction. good luck
I have the same code on my 2003 accord.
The diagnostic connector is under the dash on the driver side.
Trouble code P0811 means: Excessive clutch slippage
On a 2003 Lincoln Navigator : ( mini fuse # 41 is a 20 amp fuse for the cigarette lighter and OBD II diagnostic connector )
The 2003 Dodge Grand Caravan OBD 2 port is on lower edge of dash above parking brake pedal
Trouble code P1904 means: Kickdown Solenoid Circuit High Voltage
System Too Lean On (cylinder Bank No.1)
What does obd code P0740 mean
Trouble code P0128 means:Coolant thermostat (coolant temp below thermostat regulating temp)
You need to rent / borrow / purchase an OBD II code reader to check the code.
The 2003 Honda Civic OBD 2 port is behind center console