Question about 2002 Ford Ranger Regular Cab

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I have a 2002 Ford Ranger XLT 2.3L 4 Cylinder 2 Wheel Dr. Automatic. It is pulling the code p0171. I took it in and the fixed my mass airflow sensor. Well a few hours after I took it home the check engine light came back on and it's still pulling the p0171 code. The mass air flow sensor is a fix for that code but obviously that wasn't the whole problem. It is also almost stalling when I come to a stop. So the idle will drop down way low and it almost dies but it doesn't. I don't really wanna take it back to the shop to be fixed because the charged me way to much just for the dang mass air flow sensor. So I am wondering if others have had this same problem and some suggestions for fixes my boyfriend, who is good at fixing cars, could try so we can fix it ourselves and not spend a fortune. Any help is much appreciated. Thanks!

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Always check to make sure that there is not a PCM software update due or available. Often, as the vehicle's engine wears, the PCM's Fuel Map software inaccurately compensates for this condition. The fuel mixture grows lean and eventually, the code sets.

A vacuum leak is very common. It could be a torn PCV hose, a torn Intake Air Boot, or even a broken seal on the dipstick (the dipstick is a part of the PCV system and if it does not seal, too much unmetered air will enter the engine). Don't rule out a sticking/leaking EGR Valve or leaking EGR or Intake Manifold Gasket. If it is a V6 or V8 engine and the code is only on one side/bank, it could be a defective Intake Manifold Gasket or cracked/leaking manifold.

Posted on Dec 02, 2014

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They may have just cleaned it. take it out check for dirt on the probe. also check automotive websites, sometimes you have to reset the code so it goes away.

Posted on Dec 02, 2014

Testimonial: "Oh they put a whole new one in I'm sure of it and he rest the code as well."

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No -- the MAF Sensor-- is not a fix-- for a PO171

I do not know how you evaluate the shops labor time
or the cost of parts,so i will side with the shop

Doesn't matter if others have had the same problem
& millions have

You can not fix yourself, because you need professional
tools, to look at & evaluate the data, just to find a problem

The shop you went to-- was your mistake

They failed to do the proper testing or road test following
any repairs

You drove it home & the light came on

So obviously-- they didn't road test or wait
on the Emission Monitors to run- before giving it back

Wrong shop
Sloppy work

Did nothing for your vehicle
Just a waste of your money

Posted on Dec 02, 2014

Testimonial: "Sorry but you sound rude and I don't appreciate it. If you want to help be nice about not sound like a jerk. Thanks but no thanks"

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1 Answer

2002 ranger 2.3 codes po171 and po301 changed upstream o2 sensor still get codes any ideas?


P0301 is a engine misfire code for #1 cylinder , spark plug or plug wire problem or a bad fuel injector . Po171 system lean code . Lack of fuel , clogged fuel filter , vacuum leak . https://www.obd-codes.com/p0171 There are ways to test O2sensors before replacing . Your best bet take your vehicle to a qualified repair shop .

Feb 10, 2017 | 2002 Ford Ranger

1 Answer

I have a 1990 ford ranger xlt that blows out smoke from tailpipe its white with blue in it the mass airflow sensor doesnt do anything when un plugged it has a miss to its a 2.3 liter engine


Sounds like you have a blown head gasket - white smoke = coolant. Pull plugs and look for "steam cleaned plug" or for coolant in oil - looks milky.

Mar 20, 2011 | 1990 Ford Ranger SuperCab

1 Answer

I am getting a code p0171 and p0174 on my 1999 ford ranger 3.0 liter


P0171 is a LEAN code for cylinder bank 1

P0174 is a LEAN code for cylinder bank 2

That means your car is getting a lot of air and not enough fuel which will make the engine Misfire and rough idle. Well i can say check your mass air flow for any dirt in it and the EGR for any leaks. And also the fuel pump and the fuel lines or any restricted fuel filter. Good luck bro

Dec 28, 2010 | 1992 Ford Ranger

1 Answer

I have replaced the port seals, isolater bolts, cleaned the EGR ports, plugs and wires, and chanced the air filter. I was getting both 171 and 174 codes. Now after 60 miles or so, pulled the codes again...


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 .
Ford 150 P0171 P0174 Trouble Codes vacuum leak water test

Diagnosing Faulty Mass Air Flow Sensor P0171 P0174 Lean Codes

Aug 10, 2017 | 2000 Ford Windstar

1 Answer

My 2000 Ford Ranger keeps showing codes PO 171 and


These codes mean that the oxygen sensor is reading too "Lean" on both the left and right cylinder banks and the engine control system can't compensate any further to solve the problem. You may have a dirty or failing Mass Airflow Sensor that is miscalcuating the amount of airflow the engine is taking in which in turn can cause both of these codes to set. If the sensor is reporting less air than the engine is actually taking in then the engine computer will add only the amount of fuel it should based on what it was told by the sensor which will cause both cylinder banks to run "lean". There could be something else going on such as having two bad oxygen sensors [very rare] but I do see these two codes together quite often and usually its the sensor that is causing it. Hope this helps a bit!

Jul 11, 2010 | 2000 Ford Ranger SuperCab

3 Answers

2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

May 11, 2010 | 2003 Ford Ranger Regular Cab

2 Answers

A po171 code came on my scanner i need to know


system too lean in bank 1. clean your mass airflow sensor, replace fuel filter. iff all else fails check you fuel pump.

Nov 06, 2009 | 1998 Ford Contour

1 Answer

2002 6 cylinder 3.o engine Ford Ranger. Cold start problem. Bank 1 code PO172 and Bank 2 code PO175. System to rich. Where to start checking.


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

Oct 14, 2009 | 2002 Ford Ranger Regular Cab

2 Answers

4 codes P0171,P0174,P2195,P2197


Hi
171 system too lean
174 system too lean
2195 - 02 ozygen sensor signal stuck lean Bank1 Sensor 1
2197- 02 ozygen sensor signal stuck lean Bank 2
Sensor 1
The 2 front 02 sensors are located on the front of
the exhaust manifold.
Should solve problem and increase gas mileage.

Apr 01, 2009 | 2003 Ford Expedition

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