The 2004 Ford Explorer 4.0L engine requires Motorcraft Platinum spark plugs. Motorcraft part number SP-515 plugs, or equivalent. The Ford OE number is #1W7E-12405-AB
Here are some additional details about these spark plugs:
* Type: Platinum
* Quantity: 6
* Thread size: 14mm
* Reach: 20.9mm
* Heat range: 6
It is important to use the correct spark plugs for your vehicle, as incorrect spark plugs can cause engine damage. If you are unsure of which spark plugs to use, please consult your vehicle's owner's manual or a qualified mechanic.