Question about 1997 Ford Explorer AWD

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P171 and p174 check engine light

I went to auto zone and gave them the codes. They said it was the maf sensor. i changed it out and not even 10 miles later. the light came back on. I found the oil cap loose. but i need to get this truck smoged and cant reset the light and pass smog. any ideas

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I think autozone gave you the wrong information. My manual shows that p171 is the oxygen sensor unable to switch, and p174 is the same only the switching is too slow. Change the oxygen sensor on bank #1, and see if that works.Make sure that it is a heated sensor, match it with the old one.

Posted on Mar 10, 2009

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  • Ford Master
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Normally you can disconnect the battery for a few minutes and this does the trick. If the light comes back on, you may need to read the codes again. And, if it faults the MAF...you know it is not that and may be something else.

Posted on Mar 10, 2009

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Check engine light is on. Does replacing the oil filter fix the problem? The codes are: P171, P174


very Unlikely this will have any affect. sounds more like an air leak to me.
You will find all codes available at http://www.bluejag.co.uk/decode.php



Fault Code:- P0171 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 1 combustion too lean

Action of ECM:- ECM Default:- Bank 1 catalyst warm-up ignition ****** inhibited- Bank 1 closed loop fuel metering inhibited- Canister purge inhibited- Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature> 82 °C (180 °F) Idle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (1/1, 1/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor
Fault Code:- P0174 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 2 combustion too lean

Action of ECM:- ECM Default:- Bank 2 catalyst warm-up ignition ****** inhibited- Bank 2 closed loop fuel metering inhibited- Canister purge inhibited- Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature> 82 °C (180 °F) Idle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (2/1, 2/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor

Sep 09, 2011 | 2004 Jaguar X-Type

1 Answer

My check engine light came on 2004 ford taurus had a friend the plugged one of those code readers in got two codes po 174 and po 171 what do they mean


P174 means Oxygen sensor was slow in switching Single, Right or Rear HO2S - Fuel control

P171 means Oxygen sensor not switching - system was at adaptive limits - Single, Right or Rear HO2S - Fuel control

Visit http://www.troublecodes.net/Ford/
for a comprehensive code listing for your car.

Please rate this solution.

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Jan 08, 2010 | 2004 Ford Taurus

1 Answer

2001 E250 4.2 codes po 171 174 172 175


P171 Lean to bank one
P172 Rich to bank one
P174 Lean to bank two
P175 Rich to bank two.

These are conflicting codes. I would suspect that you have a bad MAF sensor. take it out and try and clean it before you replace it. It could also be a bad O2 sensor. But unlikely that both sides went bad at the same time.

Dec 20, 2009 | 2001 Ford Econoline

2 Answers

99blazer s10 trouble codes p171/p174


P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

A code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

P0174 is identical to P0171, except it indicates the problem exists on Bank 2 as well.

Nov 22, 2009 | 1999 Chevrolet S-10 Pickup

1 Answer

Car just hit 15,000 miles on Santa fe and Check Engione Light went on today also had oil changed yesterday. Does light automatically at 15,000


oil change lamp will come about 3000 miles but the check engine has dto do with the engine sensors and preformance.have the comouter scanned for engine codes.let me know the codes. if you have a auto zone in your area they will scan it for free just write down the numbers.

Jun 04, 2009 | 2007 Hyundai Santa Fe Limited

1 Answer

I have a 1997 Ford Explorer. Check engine light comes on after 20 miles. After reseting the check engine light. The codes that come up are P 171 & P174. I already changed out the Maf sensor. But cant get...


Here is a list of possible causes, hope this helps.


Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. The list of possible codes number in the hundreds. The code itself doesn't tell exactly what component is defective - it only indicates where to look, or what engine parameter is out of normal range. You or a technician will have to perform further testing to pinpoint cause and the proper repair. Even if you reset the light, if the underlying problem is not addressed it will come back on.

Possible Causes onepx.gif Setting Conditions onepx.gif onepx.gif onepx.gif onepx.gif
  • Air leaks after the MAF sensor, or leaks in the PCV system
  • Vehicle running out of fuel or engine oil dip stick not seated
  • EGR valve gasket is damaged or leaking around the gasket
  • Exhaust leaks before or near where the HO2S is mounted
  • Fuel injector(s) not supplying enough fuel
  • Fuel system not supplying enough fuel during high fuel demand conditions (e.g., the fuel pump may not supply enough fuel)
  • MAF sensor is dirty (can cause PCM to underestimate airflow)
  • Intake gasket leak

Mar 10, 2009 | 2001 Ford Explorer

1 Answer

Check Engine Light On


have the 02 sensors checked

Jan 20, 2009 | 2001 Ford Explorer

1 Answer

P171 p174


Do you have access to a scan tool? A more common cause for this condition is a vacuum leak. You can verify this if you check your long and short fuel trims. If the numbers are above 10 percent at idle and drop when you raise the rpm, you need to check for a vacuum leak.If they stay the same then I would look into the fuel pressure and volume.Hope this helps. If not, hit me back and I'll see what else we can do.Good luck.

Aug 21, 2008 | 2003 Ford Taurus

2 Answers

1999 pontiac grand prix . will not run


If you unplug the MAF sensor it should run using the default mapping. I'm having the same problem, but I want to figure out why it won't run with the sensor connected.

Jul 03, 2008 | 1999 Pontiac Grand Prix

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