Last reported case: 2 months ago
Based on 7 owner reports (1 from Reddit, 6 from forums)
What is P0171?
P0171 indicates your engine's Bank 1 is running with too much air and not enough fuel, which is called a 'lean' condition. This is a medium-severity powertrain issue that can reduce fuel economy and performance, and it's commonly triggered by vacuum leaks or faulty sensors. Based on 551 reports, repairs for this code average $4596, with Ford Mustangs and F-150s being among the most frequently affected vehicles.
Common Causes:
- Vacuum leaks in intake hoses or gaskets (reported in numerous discussion clusters)
- Faulty mass airflow (MAF) or oxygen (O2) sensors
- Clogged or failing fuel injectors
- Fuel delivery issues like a weak fuel pump or clogged filter
Symptoms:
- Check Engine Light is illuminated
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Rough idle or engine misfires
🚗P0171 on 2010 FORD Ranger
This page focuses specifically on P0171 issues reported by 2010 FORD Ranger owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2010 FORD Ranger Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2010 FORD Ranger owners
“2000 ford ranger 2.5l 5 speed manual 2wd. I keep getting code P0171 every couple of weeks.”View original
“I keep getting code P0171 every couple of weeks. I’ve replaced the IAC Valve and I did find a small vacuum leak.”View original
“A friend bought this truck with a bad motor. I replaced the motor after that the truck ran decent for 1 day and since then it runs rough and lack acceleration.”View original
“I ran the scanner first and the codes that remain after all that work are p0171 (passenger side) and p0175 (rich on the driver side). I may add the codes are not very consistent.”View original
“Hey guys, first off, I have a 2006 ranger single cab, xlt, 3.0, 120,000 miles. manual transmission. Everything is stock except for a magnaflow muffler.”View original
“2 codes p0171 ans p0175 this is a 2000 ext cab flex fuel p0171 is lean bank 1 and p0175 bank 2 rich ???? both lean and rich. 1- check fuel pressure 60psi..... filter and pump replaced. 2- check and cleaned MAS just under 1vdc at idle... above 2.5vdc above 2000 RPM's 3- Check compression found bank 2 bad fixed same 30-0-30 Cyl's 4,5,6 other problems are hard starts , no power max speed is 65 mph, slow off the line. the only think I can think of is the injectors?”View original
“I started to take apart my intake to get rid of my P0171 and P0174 codes on my truck. Everything is going fine with disassembly My only concern is that the previous owner told me that all work was done by a ford dealer but what I’m seeing inside doesn’t really jive with that.”View original
“So, recently purchased my Ranger and it needs both some mechanical and cosmetic work. As far as the mechanical I was getting a couple of error codes P0171 and P0460.”View original
“Below the fuel rail there is what looks to be a ¼” spacer with paper gaskets on both sides. I bought the Fel-pro upper intake gasket kit and it has the 3 plenum gaskets, egr O-ring and thick gasket for below the fuel rail.”View original
“As far as the mechanical I was getting a couple of error codes P0171 and P0460. I replaced the mass air flow sensor which seems to have taken care of the P0171 and just replaced the fuel pump module assembly which seems to have eliminated the P0460 code.”View original
These are real experiences shared by 2010 FORD Ranger owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 7 discussions about P0171 from 2010 FORD Ranger owners across automotive communities.
Success rate (29%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 1/4/2026