P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input:
The PCM read a high voltage (4.3 volts) from the MAP sensor for more than 7 seconds. This problem is usually electrical and can be solved by replacing the MAP sensor (in most cases).
P0406 Exhaust Gas Recirculation Sensor A Circuit High:
Your vehicle has an electronically controlled EGR valve that allows exhaust back into the engine to be re-burned (as a measure to lower emissions and increase economy). The PCM commands the EGR to open and close and monitors the action via a pintle position sensor. That sensor is no longer functioning. In most cases, this problem can also be fixed by replacing the EGR valve.
Usually a misfire.
To turn off the check engine, disconnect the positive battery cable for 30 seconds, then reconnect.
To reset the check engine light on a 2005 Ford Freestar, you can disconnect the negative battery terminal for about 15 minutes. This will reset the vehicle's computer and clear the light. Alternatively, you can use an OBD-II scanner to read and clear any trouble codes. However, if the underlying issue isn't resolved, the light may come back on.
The 2004 Ford Freestar is compatible with the 4R75E automatic transmission. This transmission is shared with several other Ford vehicles from that era, such as the Ford Windstar and the Mercury Monterey. When replacing or sourcing a transmission, it's crucial to ensure it matches the specifications for the 2004 Freestar to ensure proper fit and functionality. Always check for compatibility with the vehicle's engine and drivetrain configurations.
You should ensure that you have had any needed repairs done to your vehicle when the check engine light comes on. If you have an ODB reader and already performed the repairs, you can use it to reset the check engine light, otherwise it can take time after a series of cold starts, and a mix of city and highway driving for the system to reset itself.
See "Related Questions" below for the same discussion in the Windstar category - equally applies to the Freestar/Monterey
go to autozone they will hook up an OBD II scanner to your computer and explain the codes to you.
To replace the PCV valve on a 2005 Ford Freestar, first locate the valve, which is typically found on the valve cover. Disconnect the PCV valve from the hose and remove it from its grommet. Install the new PCV valve by pushing it into the grommet and reconnecting the hose. Ensure everything is secure and check for any leaks after starting the engine.
To change the spark plugs on a 2006 Ford Freestar, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the engine cover if necessary, then locate the spark plugs and disconnect the ignition coil connectors. Use a spark plug socket and ratchet to carefully unscrew the old spark plugs, and replace them with new ones, ensuring they are properly gapped. Reconnect the ignition coils and battery terminal, and start the engine to check for proper operation.
Check the Vehicle Emission Control Information ( VECI ) decal located in the front of the engine compartment ( it will show what type of spark plugs to use and the spark plug gap )
Your vehicle is trying to tell you that there is a problem that needs attention. If you do not have a reader to check your own codes, then you should take your vehicle to a mechanic to have it looked at. Ignoring the issue can potentially cause more issues that could be more costly.
To replace the water pump on a 2004 Ford Freestar, first disconnect the negative battery terminal and drain the coolant. Remove the serpentine belt and any components obstructing access, such as the alternator or engine mount. Unbolt the water pump from the engine block, clean the mounting surface, and install the new pump with a new gasket. Reassemble everything in reverse order, refill the coolant, and check for leaks.