You can start with the 02 sensor. if that does not fix the problem then you may have to consider the ECU.
The starter relay is located on the battery side of the engine compartment on a 2002 F150 pick up truck. It is on the firewall close to the battery.
We need to know which engine you have to answer this question.
The # 2 coil / sparkplug / engine cylinder is on the passenger side of the engine , 2nd from the front of the engine
If the check engine light is flashing that means an engine cylinder misfire has been detected
Image on the Firing order on a f150 2002?
yes it is
what causes hesitation on ford f150 truck
According to the 2002 Ford F-150 Owner Guide : For the 5.4 liter V8 engine : ( Motorcraft FL-820-S engine oil filter )
There could be loose rings in the engine that would cause this. The valves on the engine may also be chattering.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Motor Oil Dipsticks is located on the drivers side engine compartment.
The Ford diagnostic code 316 is a misfire detected at engine start up.