Check engine light on need to know where plug is to check what problem is

The check engine light comes on when your vehicle has a problem with the OBD 2 - onboard diagnostic's system . (emissions) When the light is on there are DTC'S - diagnostic trouble codes stored in the PCM - engine computer ! Changing the spark plug's may or may not do anything . There are a number of sensors that send signals to the PCM so PCM knows how much fuel to add to the engine . You need to take your vehicle to a qualified repair shop an have it check out .

Trouble Codes Check Engine Light On

Sounds like a diesel. Glow plugs usually need to be warmed up before starting an engine. Smaller diesels either warm up quicker or it is less critical than a tractor trailer. So either your glow plug light is normal letting you know it needs time to warm up or it's letting you know they are weak and need to be replaced. I'd check the owners manual to be sure.

Should be OBD 1 which does not need a scanner. You jumper two wires at the plug in the engine compartment to make the light flash.
If you do an internet search for Ford KOEO test you should find photos and instructions including what the codes mean.

The code P0674 tells you that something in the glow plug circuit is faulty causing the glow plug on cylinder #4 to fail to heat up. The entire circuit must be checked to locate the fault.

Symptoms With just one glow plug failure other than the check engine light coming on, the symptoms will be minimal since the engine will normally start with one bad plug, under freezing conditions you would be more likely to experience hard starting.

Potential Causes The causes for this DTC may include: Faulty cylinder #4 glow plug Open or shorted glow plug circuit Damaged wiring connector Faulty glow plug control module Diagnostic Steps & Possible Solutions You will need a digital volt ohm meter (DVOM) for the complete test.
Continue through the tests until the problem is confirmed. You will also need a basic OBD code scanner to reset the computer and erase the code. Check the cylinder #4 glow plug by disconnecting the wire connector on the plug. Place the DVOM on ohms and place the red lead on the glow plug terminal and the black lead on a good ground. The range is .5 to 2.0 ohms, if it is out of range replace the glow plug.

Doubt it. You will need to have it scanned for codes. You can do it yourself with a paper clip. Do you know where the diagnostic plug is in the engine compartment.

change your air filter and also change your wireing and spark plugs

Code P0301
Ignition Coil Pack
Ignition Cable
Spark plug
Clog or dirty fuel injector
Evap canister purge valve
Engine Compression
fuel pressure

you have 3 type of engine for your truck
2.3L 4 cylinder
3.0L 6 Cylinder
4.0L 6 Cylinder

need to know that type Engine

The reason why the service light come on because it is a hard code
not a soft code.

Let me know

NEED SOME MORE INFO... FIRST WHEN YOU TURN KEY TO THE RUN POSITION DOES THE CHECK ENGINE LIGHT LIGHT ON THE INSTRUMENT CLUSTER.. IF SO YOU KNOW YOUR COMPUTER IS POWERING UP... SECOND NEED TO KNOW WHAT IS MISSING...1...SPARK....FUEL OR INJECTION.. PULL ONE PLUG WIRE OFF COIL PACK HAVE SOME ONE CRANK CAR DO YOU SEE SPARK JUMPING ON COIL... SECOND SINCE YOU VERIFIED FUEL SYSTEM.. NEXT IS TO PLUG ONE PLUG AND SEE IF IT IS WET WITH GAS OR DRY LET ME KNOW AND I WILL HELP FURTHER

yes about the upper intake and the only way i know how to check the coils is with a engine anilyser or if the check engine light comes on then you can have the codes pulled and that will tell you which cylender is missfiring this engine has a indevidual coil for each spark plug so thares 6 of them and thay slide right down over the sparkplugs

IT IS LOCATED BEHIND THE GLOVEBOX. JUMP THE CONNECTOR AND COUNT THE FLASHES OF THE CHECK ENGINE LIGHT. HOPE THIS HELPS, LET ME KNOW. BEST OF LUCK TO YOU.