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How do you repair 0174 bank 1 runnng lean on 04 4.6 F150?

To repair code P0174 (bank 1 running lean) on a 2004 4.6L Ford F150, follow these steps:

1. Check the fuel pressure: Make sure the fuel pressure is within specifications. A low fuel pressure can cause the engine to run lean.

2. Check the fuel injectors: Make sure the fuel injectors are clean and not clogged. A clogged fuel injector can cause the engine to run lean.

3. Check the air intake: Make sure the air intake is clean and free of obstructions. A blocked air intake can cause the engine to run lean.

4. Check the oxygen sensors: Make sure the oxygen sensors are clean and not damaged. A faulty oxygen sensor can cause the engine to run lean.

5. Check the vacuum lines: Make sure the vacuum lines are connected and not cracked or damaged. A leak in the vacuum lines can cause the engine to run lean.

6. Check the PCV valve: Make sure the PCV valve is clean and not stuck closed. A stuck closed PCV valve can cause the engine to run lean.

7. Check the catalytic converter: Make sure the catalytic converter is not clogged or damaged. A clogged catalytic converter can cause the engine to run lean.

If you have checked all of these items and the engine is still running lean, you may need to have the PCM (powertrain control module) reprogrammed.

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