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PO172 AND PO175 CODES - 2000 Ford Windstar

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These codes mean system too rich, meaning too much fuel while running, I would check the vacuum lines and then clean the Mass Air Flow sensor (MAF), it should be located in line with the air intake tube from the air filter. Be careful not to damage the sensors internal components (use electrical cleaner or brake cleaner), and make sure it is dry before re-installation. Hope this helps, let me know.

Posted on Aug 09, 2010

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Pops65Pony
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SOURCE: 2002 6 cylinder 3.o engine Ford Ranger. Cold start

Changed the air filter lately? Possibly defective O2 sensors, but I doubt it. If air filter and intake are clear, I'd check barometric pressure sensor and mass air flow sensors. Get a Haynes or Chilton's for $25 at Pep Boys for instructions on testing these componenets

Posted on Oct 14, 2009

  • 14 Answers

SOURCE: Want to know what PO172 System too rich bank 1

it means your cars computer is pumping too muchgas into your motor because it thinks the engine is either running lean possibly due to faulty o2 sensors or that the coolant temp sensor is giving false readings and the ecm thinks the car is still too cold.

Posted on Mar 02, 2009

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SOURCE: 3.5l Ra Rodeo running rich

The PCm has determined that during testing, ther fuel system for bank 2 was too rich. Can anyone know the solution?

Posted on Jan 12, 2009

chuck943
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Well this one will be a tough one.
P0761 is shift solenoid 3 malfunction. Most likely caused by a broken valve retainer in the valve body.
The other four codes well that may be tough to diagnose. See P0171 and P0174 are bank 1 and 2 are lean and
P0172 and P0175 are bank 1 and 2 are rich.
To have both banks coding rich and lean would be extremely rare.
I suspect you have a couple of problems like may be a MAF sensor problem, a vacuum leak, and maybe a restriction in the exhaust.
The exhaust restriction would be easy to diagnose. You would need a vacuum pressure gage and hook it into the hoses from the DPFE sensor. You should have 1PSI or less at idle and 3-4 PSI at wide open throttle anything more would be a restriction.

Posted on Apr 14, 2009

ZJLimited
  • 17970 Answers

SOURCE: what is the dianostic codes on my Saturn PO172 and

P0172 - System Too Rich (Bank 1)

What does that mean?
Basically this means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0175, and in fact your vehicle may show both codes at the same time.

Symptoms:
You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.

Causes:
A code P0172 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 can 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.
* There could be a fuel pressure or delivery problem

Possible solutions include:
* Inspect all vacuum and PCV hoses, replace if necessary
* Cleanthe MAF sensor. 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 fuel lines for cracks, leaks, or pinches
* Check the fuel pressure at the fuel rail
* Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
* Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)



P0175 - System Too Rich (Bank 2)

What does that mean?
Basically this means that an oxygen sensor in bank 2detected a rich condition (too little oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is the side of the engine that doesn't have cylinder #1.

Note: This DTC is very similar to P0172, and in fact your vehicle may show both codes at the same time.

Symptoms:
You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.

Causes:
A code P0175 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 can cause the MAF to become dirty if the filter is over-oiled
* There could be a vacuum leak.
* There could be a fuel pressure or delivery problem

Possible solutions include:
* Inspect all vacuum and PCV hoses, replace if necessary
* Clean the MAF sensor. 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 fuel lines for cracks, leaks, or pinches
* Check the fuel pressure at the fuel rail
* Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
* Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)



Hope helps (remember rated this).

Posted on Jun 25, 2010

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