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2003 Ford F-150 P0174 Code: Lean Condition on Bank 2 - Diagnosis and Solutions

Model: 03 F-150 Fault Code: P0174 Posted: 2019-07-19 17:04

I own a 2003 Ford F-150 with a supercharged 5.4L V8 engine, currently at 114,000 miles. The vehicle is showing a P0174 diagnostic trouble code, indicating a lean condition on bank 2 of the fuel system. When I accelerate, there's noticeable hesitation—sometimes the engine runs fine for a while before the code reappears. I'm looking for expert advice from fellow mechanics and enthusiasts. Any insights into possible causes or troubleshooting steps would be greatly appreciated. Best regards, kos2kos

Related fault codes
P0174
Comments (4)
Anonymous 2019-07-20 09:52

Could you please share the fuel trim values for both banks at idle and at 3000 RPM? Additionally, provide the freeze frame data associated with the P0174 code. This information will help pinpoint whether the issue is related to fuel delivery, vacuum leaks, or sensor malfunctions.

Anonymous 2019-07-20 10:53

Okay, my younger brother—new to this diagnostic work. I'm retired now and focus on salvage vehicle operations. The scan tool I'm using is a CEN-TECK 60794. Here's the freeze frame data for P0174: - DTC: FR2F, P0174 - Fuel System 1: CL (no fault) - Fuel System 2: -- - Load % at idle: 20.4; at 3000 RPM: 14.9 - ECT (Engine Coolant Temp): 174°F at idle, 176°F at 3000 RPM - Short Term Fuel Trim Bank 1: 0.8%, fluctuates between 1.6 and 4.7% at 3000 RPM - Long Term Fuel Trim Bank 1: 24.2% - Shift 2 (Bank 2): 8.6% at idle, drops to 3.9% at 3000 RPM - Long Term Fuel Trim Bank 2: 25.0%, fluctuates between 5.5% and higher - RPM behavior: Sticks around 700 RPM; rises above 1000 then drops back to 700 - Spark plug timing: 33.5° - MAF reading: 0.02 g/s at idle, increases to 0.07 g/s at 3000 RPM My friend—thank you for your time and attention. I hope this data is helpful. If not, please let me know. Best regards, kos2kos

Anonymous 2019-07-20 11:19

If both fuel trims are consistently high (+20%) at idle and gradually return to normal (5–10%) at higher RPMs, a vacuum leak is likely the root cause. However, if both banks show persistently elevated fuel trim values even at higher engine speeds, suspect issues with the Mass Air Flow (MAF) sensor or fuel delivery system. Note: All readings should be taken after the engine has reached full operating temperature. A typical ECT value in this scenario is around 200°F.

Anonymous 2019-07-20 11:57

Hey, my young friend—thank you for your helpful feedback! I used to work in a garage with my dad during the 1960s through the 1990s. I helped him on the side when business was slow. I’ve always loved working on cars and bikes, though I’ve recently developed more interest in vehicle diagnostics using computer tools—LOL! Are you involved in automotive repair or maintenance? Do you run a shop? Thanks for your time and insight. Best regards, kos2kos