Last reported case: 3 months ago
Based on 4 owner reports (1 from Reddit, 3 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 TOYOTA Tacoma
This page focuses specifically on P0171 issues reported by 2010 TOYOTA Tacoma owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2010 TOYOTA Tacoma Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2010 TOYOTA Tacoma owners
“1998 Tacoma 2.4 5spd RWD Single Cab - Codes P0171/P0133 Just picked up a first gen as my daily and it’s throwing these codes, looking for any help to keep this thing going!”View original
“Just picked up a first gen as my daily and it’s throwing these codes, looking for any help to keep this thing going! Engine is running very lean, tested live data - short FT & Long FT at 19.49%”View original
“I have read through a few threads about this, but can't seem to find anything related to my exact issue. So here's a go at my first post on here. 2005 OR 74k 6 speed manual.”View original
“I received it still with; og diff fluid, Trans case fluid, and gear box fluid, og coolant, ps fluid and pcv valve. Og sparkplugs, Ac was out, needed tires.”View original
“I got it for a good price partially because it had a check engine light. I was told that the mass airflow (MAF) sensor was replaced and that he believed there was a vacuum leak.”View original
“Check engine light is always on after getting new battery, maf sensor, there is no vacuum leaks, nor any damage to the fuel pump or system. But I was told by a mechanic, if the transmission is having problems it can trigger O2 Sensors and make the ECU run lean or rich, in this case Im not sure.”View original
“However, just sometimes when I'm driving it'll shift normally, but most of the time it doesn't. Check engine light is always on after getting new battery, maf sensor, there is no vacuum leaks, nor any damage to the fuel pump or system.”View original
“I was told that the mass airflow (MAF) sensor was replaced and that he believed there was a vacuum leak. Looking at the truck it was mostly all original meaning hard cracked vacuum lines and even a large crack on the air intake hose.”View original
These are real experiences shared by 2010 TOYOTA Tacoma owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 4 discussions about P0171 from 2010 TOYOTA Tacoma owners across automotive communities.
Success rate (25%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 11/11/2025