Question about 2001 Ford Taurus

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Diagonostic trouble codes reported p0171 p0174 p0302 2001 Taurus, only reports P0171

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P0171 is system too lean bank 1, P0174 is too lean bank 2, and 302 is misfire bank 1. Look for vacuum leaks. If you don't find them, put a vacuum gage on it can check. The P0171 is almost always a vacuum leak. If not other possibilities are front O2 sensor is too old and should be replaced (if mileage is greater than 100k then replace). Try injector cleaner. Misfires are usually bad spark plugs, but could possibly be caused by insufficient fuel. I've never had a car of mine in bad enough shape to have that error.

Posted on Oct 24, 2008

  • Doug_chemist Jun 03, 2014

    This is for my own solution, but it should be helpful. The Taurus has a PCV that is well hidden below the intake manifold and the hose to it dry rots if the valve isn't replaced in a timely manner. The is the likely source of vacuum leak for older Fords.

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P0171=THROTTLE MOTOR POSTION 2, RANGE/PERFORMANCE PROBLEM.. P0174= FUEL MEARSUREMENT SYSTEM BANK 1, INJECTION TIMING INCORRECT....P0302 RANDOM/ MUTLIPLE MISSFIRE DETECTED ???

Posted on Sep 14, 2008

  • Aurelio Santucci Jun 05, 2012

    P0171= System To Lean (Bank 1)
    P0174= System To Lean(Bank 2)
    P0302= Cylinder 2 Misfire Detected
    This is straight out of the Actron CP9125 Scan Tool Book
    Not what this guy wrote you would be chasing ghosts with those explanations.

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DIAGNOSTICS TROUBLE CODES P0171, P0174


System too lean on bank 1 and bank 2

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Is it usual to have both p0171 and p0174 codes report at same time


sounds like the guy at the dealer ship hit the wires to the o2 sensor changing the oil fiter

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P0171 is a lean fuel condition . The computer reflashed has nothing to do with it . Vacuum leak intake manifold probably . If both P0171 & P0174 were back could be fuel pump low flow or restricted fuel filter . or O2 sensor problem or mass airflow sensor. Suggest you take it to a qualified repair shop to have it diagnosed .
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What is the code P1451 solution? Runs great, codes P1451, P0171 and P0174 are coming up and the engine light is on. Car needs to get inspected but codes need to be fixed.


P0171 - System too Lean (Bank 1)
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just tune up ur car periodicly, clean filter. clean ur sparkplug.

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Diagonostic trouble codes reported p0171 p0174 p0302


P0302 is cyl #2 misfire and the other 2 are lean or rich codes because of the misfire repair code P0302 first and the other 2 codes will most likley clear up.

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