Ok so i installed an AF1 on my truck.. cant get the CEL to go off, heres the numbers my code reader is giving me.. have no idea what they mean.. hopefully someone here knows what to make of it and knows what good numbers are.



Year: 2004
Make: ford
Model: f150 screw
Engine: 5.4L

Stored:
P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)

Pending:
P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)

MIL ON
MisFire Monitor Complete
Fuel System Monitor Complete
Comprehensive Component Monitor Complete
Catalyst Monitor Not Complete
Heated Catalyst Monitor Not Supported
Evaporative System Monitor Not Complete
Secondary Air System Monitor Not Supported
A/C System Refrigerant Monitor Not Supported
Oxygen Sensor Monitor Complete
Oxygen Sensor Heater Monitor Complete
EGR System Monitor Not Supported

DTC For Which Freeze Frame Was Stored P0171
Fuel System 1 Status Closed Loop
Fuel System 2 Status Not Supported
Calculated LOAD Value 75.69 %
Engine Coolant Temperature 170.6 °F
Short Term Fuel Trim - Bank 1 -7.81 %
Long Term Fuel Trim - Bank 1 26.56 %
Short Term Fuel Trim - Bank 2 -6.25 %
Long Term Fuel Trim - Bank 2 28.91 %
Engine RPM 1448.50 rpm
Vehicle Speed Sensor 51.3 mph
Ignition Timing Advance for #1 Cylinder 23.50 deg
Intake Air Temperature 62.6 °F
Air Flow Rate from Mass Air Flow Sensor 3.791 lb/min
Absolute Throttle Position 20.39 %
Oxygen Sensor Output Voltage (B1-S1) 0.75 V
Short Term Fuel Trim (B1-S1) -7.81 %
Oxygen Sensor Output Voltage (B1-S2) 0.79 V
Short Term Fuel Trim (B1-S2) 99.22 %
Oxygen Sensor Output Voltage (B3-S1) 0.79 V
Short Term Fuel Trim (B3-S1) -5.47 %
Oxygen Sensor Output Voltage (B3-S2) 0.80 V
Short Term Fuel Trim (B3-S2) 99.22 %

 

All that is needed is the codes 171,174.
The rest is of no value in this instance.
If all you done was put the air filter system on , then you must have upset the Mass Air meter, its connector, the IAT or have an air leak between the Mass Air meter and the throttle body.
If you can't find anything, replace the stock system, clear the codes and see what happens.
Your experience has happened to others.

 

Look for an air leak between the MAF and the throttle body.

Since your fault appears to have been related directlky to the installation of the AF1, I won't go into the normal advice to check the PCV elbow, but do it anyway. Might be a coincidence, never know.

Steve