Live data question, codes p030, P0306 and P0174 misfire?

Tiny
FORDSMB454
  • MEMBER
  • 1996 FORD F-150
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
Recorded live data from my truck does anything look of concern or faulty/bad

From reading this for I see high idle and maybe o2 sensor is bad on bank 2 side? Also, DTC codesp030, p0306, and p0174 misfire and bank 2 lean cylinder 1 and 6 misfire and think the o2 sensor may be faulty unsure also I did do a slight rev in that live data in the begin ish again thank you so much for your help.

Live Data
Numbers of DTCs 3
Fuel system 1 status--
Fuel System 2 status--
Calculated Load Value(%)18.0
Engine Coolant Temperature(°C)59
Short Term Fuel Trim -Bank 1(%)-3.9
Long Term Fuel Trim - Bank 1(%)5.5
Short Term Fuel Trim -Bank 2(%)-3.9
Long Term Fuel Trim - Bank 2(%)23.4
Engine RPM(rpm) 884
Vehicle Speed Sensor(km/h)0
Ignition Timing Advance for #1 Cylinder(°)6.0
Intake Air Temperature(°C)15
Air Flow Rate from Mass Air Flow Sensor(g/s)10.02
Absolute Throttle Position(%)15.7
Commanded Secondary Air StatusOFF
Location of Oxygen SensorsB1S12--B2S1---
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.785
Short Term Fuel Trim Bank 1-Sensor 1(%)-5.5
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.100
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.865
Short Term Fuel Trim Bank 2-Sensor 1(%)-4.7
OBD requirements to which vehicle is designedOBDII
Saturday, January 25th, 2025 AT 11:28 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,022 POSTS
Hi,

The voltages and trims are within specification. What is happening? Also, interestingly, the negative short term fuel trims are odd. That indicates the computer is trying to remove more fuel from the engine, but the LTFT for bank 2 is adding a lot of fuel. Ugh!!! LOL this is interesting.

By any chance, is there an exhaust leak before the downstream sensor? That can throw things off. Additionally, take a look through this link. It explains how to test the O2 sensors. Check bank 2 sensor 2.

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

One other thing to consider is the engine temperature. You are not at operating temperature. That can cause a false positive. Allow it to warm to operating temperature when checking live data. It should be around 195°F when checked.

Let me know.

Joe
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Saturday, January 25th, 2025 AT 8:52 PM
Tiny
FORDSMB454
  • MEMBER
  • 42 POSTS
Okay, thanks so much. Take care.
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Saturday, January 25th, 2025 AT 9:33 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,022 POSTS
Hi,

No problem whatsoever. Let me know what you find. I'm interested in knowing.

Take care,

Joe
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Saturday, January 25th, 2025 AT 11:00 PM

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