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Ford f250 460 code p0172

Code P0171 and P0172. truck run rough and stalls. also dies when you come to a stop. it is getting about 4 mpg, whats goin on with this thing?

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  • Ford Master
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Here's code P0172.here's code P0171.

Posted on Apr 07, 2013

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Posted on Jan 02, 2017

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csmock132
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SOURCE: check engine light on,running rough code P0172

When I see all these codes i instantly think of two things. Vacuum leak especially intake manifold gaskets and Mass air flow sensors. Spray the engine with carb cleaner when its running and see if you get it to rev up,run rough or run different. Next unplug the MAF and drive the car, see if it runs normal.

Posted on Jun 02, 2009

sscullys
  • 984 Answers

SOURCE: my truck is v6 4.2l and have 2 codes p0171 and

Have you cleaned the MAFS ( Mass Air Flow Sensor ) which is in the intake by the air filter ( little tower with hole in it ).
Usually the lean conditions are reported due to un-metered air in the system which could be the MAFS not keeping track correctly due to it being dirty.
The other problem could be cracked vacuum lines, usually the one to the back of the throttle body ( under the plastic cover ). This is another way for unmetered air getting into the system.

Start with cleaning the MAFS ( with MAFS safe throttle body cleaner, the can will specifically state MAFS safe, don't assume ), after putting it back together ( making sure the tubing is together from the MAFS to the throttle body ) disconnect the battery for 10 min, reconnect and take for a drive, varying the throttle from 30 MPH up to 48 MPH for 2 cycles, to make sure all the system tests have completed.
If you get the CEL light again, start with checking the vacuum lines ( old enough truck, might need to be replaced ).
Could be other things, but these are the most common ones.

Posted on Jan 11, 2010

  • 407 Answers

SOURCE: check engine light on,running rough and stalling.

means you have multiple misfires (po300) the other codes are lean codes, possiable tune up , bad injector, fuel pump,

Posted on May 07, 2009

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CODES p0172 AND p2196 AND p0171


Illuminated Check Engine Lamp with Diagnostic Trouble ...

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May 11, 2015 - Illuminated Check Engine Lamp with Diagnostic Trouble Codes ...P2196, P2197, P0171, P0172, P0174, P0175 or P162F - 2015 Ford Transit.

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My check engine light is pulling up code P0172 my read out says the problem is in bank one only


P0172 is bank 1 rich. May have a fuel injector stuck open or a bad o2 sensor.

Jul 25, 2015 | Cars & Trucks

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I got a code p017.2 AND P017.1 for a 2005 dodge grand caravan sxt 3.8l


Po171 not P017.1 system lean http://www.obd-codes.com/p0171

P0172 not P017.2 system rich http://www.obd-codes.com/p0172

bad mass air flow sensor , O2 sensor , PVC system problem

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1 Answer

P0171 p0172


Here's code PO171.Here's code P0172.

May 08, 2013 | Ford Explorer Cars & Trucks

1 Answer

Speedometer sudenly stoppped working. now works intermittently. also shows check engine light. It is showing p0171 & p0172 codes. Lean and rich. seams like they contradict each other. occasionaly the...


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
OBD II P0172 Fuel System Too Rich (Bank 1).P0172 - System Too Rich (Bank 1) Essentially this DTC means that an oxygen sensor in bank 1 detected a rich condition.
When the code says that the Fuel System is "too rich," it means that the computer has been subtracting more and more fuel, which is called Long Term Fuel Trim. Ideally, the Long Term Fuel Trim should be close to 1 to 2 percent. When a code P0172 is set, it means that the Fuel Trim is anywhere from -15 percent to as low as -30 percent compensated. When this happens, the computer knows that there is an improper condition in the control of the Fuel System.


Thanks.

Feb 07, 2010 | 1996 Volvo 850

2 Answers

Check engine light on,running rough code P0172


When I see all these codes i instantly think of two things. Vacuum leak especially intake manifold gaskets and Mass air flow sensors. Spray the engine with carb cleaner when its running and see if you get it to rev up,run rough or run different. Next unplug the MAF and drive the car, see if it runs normal.

Jun 02, 2009 | 2005 Hyundai Elantra

2 Answers

Check engine light on,running rough and stalling.


means you have multiple misfires (po300) the other codes are lean codes, possiable tune up , bad injector, fuel pump,

May 07, 2009 | 2001 Isuzu Rodeo

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