Question about 2001 Ford Taurus

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2005 Ford Taurus SE 3.0L V6 OBD Codes P0171 and P0174

Was getting fault code P0420, so I replaced all four O2 sensors with Bosch models. Also replaced plugs (Motorcraft platinum) and plug wires (Motorcraft). Car seems to run fine on road, but initial start up idle is high (12-1300 RPM) and at idle during stops occasional misses are felt (seems like a slight lurch). Fault codes P0171 and P0174, indicating lean mixture on banks one and two, came up after stopping. Car has 98,000 miles on it.

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The P0420 code is a Catalytic converter efficiency code check the compression.Swap the #1 injector to a different location to see if the code follows.Test the coilpak. A cracked exhaust manifold is the most likely cause p0171 and 0174 Induction air leaks, vacuum or some kind fuel restriction, weak fuel pump, restricted fuel filter etc.You also could have an exhaust leak near the upstream o2 sensor. If youtake it in they will probably use smoke to find out where the leak is.

Posted on Apr 22, 2009

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My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?


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replace the catalytic converter

The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar.

Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

https://www.obd-codes.com/p0420

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How do I pass emissions with my 1997 does explorer XLT P0


The recommended repair for both the P0171 and P0174 codes is to clean the MAF sensor. Ensure you use the proper cleaning solution, as there are many that will damage the sensor. Buy a cleaner that is made specifically for MAF sensors. The P0420 code will probably clear up if the MAF sensor clears the other two codes.

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Dakota p0171 p0174 taurus


code p0171 refers to system to lean bank 1==causes intake /exhaust leak--AIR system--MAP/MAF sensor--fuel pressure/pump--injectors--HO2s Have a fuel pressure test done on the fuel manifold to check for blocked filter/faulty pump/fuel pressure regulator faults
code p0174 refers to system to lean bank 2 --same causes including hose connection/s
code p0420 refers to catalytic converter system -bank 1 efficiency below threshold==causes catalytic converter--wiring--HO23. Check the cat converter is not cracked inside and the oxygen sensor is working.

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I have a 2005 Ford Taurus SE (Flex Fuel), 3.0L, OHV. I recently had my A/C compressor replaced due to a clutch disc failure. The new compressor/clutch works great, engages/disengages properly, and blows...


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Hi,

I'm Ben and -- hopefully -- I can provide some meaningful assistance.

In my opinion, the problem lies with you P0174 reading. I'll explain.

OBD II Fault Code

OBD II P0171
OBD II P0174

Fault Code Definition

OBD II P0171 Fuel System Too Lean (Bank 1)
OBD II P0174 Fuel System Too Lean (Bank 2)

Symptoms

  1. Check Engine Light will illuminate
  2. In some cases, no adverse conditions may be noticed by the driver
  3. In other cases, there may be performance problems, such as a lack of power on acceleration and some "coughing" or misfiring
  4. The vehicle may have trouble idling, especially when warm or when sitting at a stoplight

Common Problems That Trigger the P0171 and P0174 Code

  • PCM software needs to be updated
  • Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.)
  • Mass Airflow Sensor (MAF)
  • Plugged Fuel Filter or weak Fuel Pump
  • Plugged or dirty Fuel Injectors

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2 Answers

Ford ranger engine codes P0171 &P0174 ?


Hi hope I can help.
P0171 mean bank 1 is to lean
P0174 means bank 2 is lean
You did not state what engine you have but by your codes you must have the V6 4.0.
These codes refer to a fuel issue. bank 1 and bank two represent each of your manifolds.
being you have a V6 you have 2 manifolds.
Each of your manifold have an O2 sensor in it. That's what is giving the lean reading.
This does not mean that you have bad O2 sensors.
They are just doing there job.
So you should check your fuel pressure with a gauge and make sure your pressure is correct.
It seams as your fuel pump maybe weak.
Hope this helps.
Please leave feed back
Thank you urnuts73@ FixYa

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1 Answer

My 98 taurus has this codes what do i need to fix? p1518.p0174.p0


p0171 and p0174 are o2 sensors, There are 4 o2 sensors on a Taurus. 1 on each exhaust manifold, and 1 after each catalytic converter.
p1518 is vehicle speed, idle speed control----this means the idle air control needs fixed. you can take it off and clean carbon from it. do not push on end of air valve it will loose its adjustment. do not put in any liquid to clean, the best way is to clean end of valve with an old toothbrush or similar. also clean carbon from engine side where iac mounts. when clean put back on. you can use carb cleaner for end of valve, as for the 02 sensors, you have to find out which ones are bad first. or replace all thats up[ to you. you have to get a 02 sensor socket for 3/8 drive. then they just turn out. the best way to get them out is have the car warm.

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1 Answer

98 ford taurus starts, runs, dies


change the coolant temp sensor and rest the codes then try
cleam the MAF by brake and parts cleaner

i hope its help thanx

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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.

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