Last reported case: 1 years ago
Based on 3 owner reports, 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 LEXUS ES
This page focuses specifically on P0171 issues reported by 2010 LEXUS ES owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2010 LEXUS ES Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2010 LEXUS ES owners
“I reset the codes after sticking my hand down there until I changed the hissing noise and sealed it with dabs of gasket sealer. Leak is permanent about 1000 miles ago.”View original
“I just got P0171 P0174 again (2003 ES300 108k), I got the code a few months ago - replaced the mass airflow sensor. Have not driven the car much in last few months and the codes just came up again.”View original
“[QUOTE=dpwct;11828978]I just got P0171 P0174 again (2003 ES300 108k), I got the code a few months ago - replaced the mass airflow sensor. Have not driven the car much in last few months and the codes just came up again.”View original
“What should I look into? Quote: Originally Posted by dpwct I just got P0171 P0174 again (2003 ES300 108k), I got the code a few months ago - replaced the mass airflow sensor.”View original
“Quote: Originally Posted by dpwct I just got P0171 P0174 again (2003 ES300 108k), I got the code a few months ago - replaced the mass airflow sensor. Have not driven the car much in last few months and the codes just came up again.”View original
“P0171 P0174 2003 Es300 I just got P0171 P0174 again (2003 ES300 108k), I got the code a few months ago - replaced the mass airflow sensor.”View original
These are real experiences shared by 2010 LEXUS ES owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 3 discussions about P0171 from 2010 LEXUS ES owners across automotive communities.
Success rate (0%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 1/29/2025