2000 Ford F150 P0118, P0171, P1289, P0174

Question

These codes showed up recently. Taken individually, I can read what the codes mean, but when I look at them together, is there a big picture I should see or a lightbulb that should go on? Somewhere out there, someone can look at these codes and know just what to do. So, what's the fix?

Answer 1

Did the car overheat? I would start by replacing the thermostat and making sure the water pump is not leaking.

P01289- Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range

P0118- Engine Coolant Temperature Sensor Circuit High

 

P0171- means bank 1 has too much air, check for intake leaks.

P0174- means bank 2 has too much air, check for intake leaks.

possible causes: 

- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring 
- Faulty fuel injectors 
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection