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P0174 and P0301 Fault Codes on 2000 Ford F-150 V6: Diagnosis and Fixes

Model: ford f 150 Fault Code: P0174 Posted: 2015-06-19 17:27

I'm experiencing persistent P0174 and P0300 codes on my 2000 Ford F-150 with a 5.4L V6 engine. I've already replaced the MAF sensor, fuel filter, spark plug wires, coil pack, and installed new spark plugs. Despite these repairs, both fault codes continue to appear on my OBD2 scanner. The check engine light remains on. What could be causing this issue? Are there any overlooked components or diagnostic steps I should try before considering further repairs? Thanks for your help.

Related fault codes
P0174P0301
Comments (5)
Anonymous 2015-06-19 19:40

Test the fuel injector in cylinder #1 — a faulty injector can trigger both P0174 (rich mixture on bank 2) and P0301 (misfire in cylinder 1).

Anonymous 2015-07-06 12:50

The issue might be related to the PCV (Positive Crankcase Ventilation) hose connecting from the intake manifold to the valve cover. This component is often sold as a complete assembly, not separately. If you've replaced it individually and still have issues, try purchasing the full Ford OEM PCV system from an authorized dealer — this has resolved similar problems in 2000 F-150 models.

Anonymous 2015-07-06 12:51

I agree that P0301 could be caused by a defective coil pack or spark plug, especially if the engine is running too rich on bank 1. A rich fuel mixture can lead to misfires and trigger both P0174 and P0301 codes.

Anonymous 2015-07-08 13:02

I've replaced the MAF sensor, upper O2 sensors, fuel filter, and inspected all vacuum hoses — everything appears intact. After installing a cold air intake (CAI) and dual exhaust system, the check engine light turns off for about 40 miles before reappearing. Could this be related to ECM or BPA-ISC issues? Any guidance on diagnosing these components would be appreciated.

Anonymous 2015-07-08 13:39

defiantbravo — it's unlikely that the ECM or modules are at fault in this case. Remove the cold air intake and stick to OEM parts. Clean the MAF sensor thoroughly, check fuel pressure, and ideally use an OBD2 scanner to monitor fuel trims and oxygen sensor voltages. Don't forget to inspect the PCV system — it's a known source of vacuum leaks in 2000 F-150s. By the way, what does BPA-ISC refer to? Is that a specific module or diagnostic component?