Question about 2003 Ford Ranger Regular Cab

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Check Engine Light On and O/D Light Flashing

So my check engine light came on and I noticed my truck started to idle roughly after about a minute of sitting at a dead stop. Other than that it runs okay. Sometimes if I'm at a rather long red light, it will feel like it is about to stall. I looked up this problem online and the majority of similar problems was an O2 sensor. So I took it AutoZone to have the codes checked and it threw a P0171, a P0174 and a P0151. These codes basically said that Bank 1 & 2 are too lean and that the oxygen sensor MAY be bad. It also suggests: Fuel pump or pressure regulator. Well the AutoZone people tell me that I'll just have to start somewhere and replace parts. They're not gonna suggest one particular b/c they want me to buy them all. What does it sound like to you?

Also, just today my O/D light began to flash. It says, "O/D off" and the only thing I notice about it is that is shifts roughly from first to second gear very rough, even with a slight jolt. What's up with that?

Posted by on

  • solboy803 Dec 29, 2008

    I may try to change the oxygen sensor but I have no idea where that is in the engine. Anyone?



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I had the same problem - my mechanic reset the engine light and told be to run premium gas in it. Runs fine now. I still use the premium gas, I get better mileage with it. Try that and it might solve the problem

Posted on Dec 23, 2008


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Posted on Jan 02, 2017

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SOURCE: Diagnostic Codes p0171 bank 1, and p0174 bank 2 (too lean)

Those codes are for the oxygen sensors, lean fuel mixture on both banks. Change them, problem with stalling and rough idle should go away.

Posted on Apr 23, 2009

  • 1450 Answers

SOURCE: Mass Air Flow Sensor, oxygen sensor and coil plugs

look for vacuum leaks the last 4 codes are lean codes
primarily lookm at the pcv hose noturious for collapsing

Posted on Sep 16, 2008

  • 1902 Answers

SOURCE: Codes P0171, and P0174 bLean on a 98 Navigator. Any ideas?

O171 MAF (Mass Airflow Sensor) Just try cleaning this part it usually solves that problem without having to buy new part.

0174 Both are mass air flow sensors. The other problem can be a vacuum leak Check PCV valave and all vacuum lines. Also make sure fuel filter and fuel pump are working correctly. You can clean the MAF with some brake cleaner make sure it is dry before you install it back

Posted on May 28, 2009

  • 166 Answers

SOURCE: diagnostic code #'s p0174,p0171

oxygen sensors are telling you that the mixture is too poor on ur sistem need to check its behaviour and see whats causing that lean mixture
hoope this helps

Posted on Nov 10, 2009

  • 1149 Answers

SOURCE: odb2 reading codes p0171, p0174, p0300. running


  • 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
  • Posted on Dec 11, 2009

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