Last reported case: 8 years ago
Based on 8 owner reports, 8 from forums)
What is P0174?
P0174 indicates your engine's Bank 2 is running with too much air and not enough fuel, a condition known as 'lean.' This is a medium-severity powertrain issue that can trigger reduced engine performance and fuel economy. Based on owner reports, it commonly appears in vehicles like the Nissan Maxima and Ford F-150, often related to air intake or fuel delivery problems.
Common Causes:
- Vacuum leaks or air intake leaks (commonly mentioned with older vehicles like the 2010 Nissan Maxima)
- Faulty or dirty mass airflow (MAF) sensor
- Clogged or failing fuel injectors on Bank 2
- Exhaust leaks (mentioned in owner reports of rusted exhaust systems)
- Weak fuel pump or restricted fuel filter
Symptoms:
- Check Engine Light is illuminated
- Engine may run rough or misfire (as reported in Honda Accord cases with cylinder misfires)
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Engine may occasionally stall at idle
🚗P0174 on 2020 FORD Expedition
This page focuses specifically on P0174 issues reported by 2020 FORD Expedition owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2020 FORD Expedition Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2020 FORD Expedition owners
“It started giving me a blinking engine light, so I got the codes read and it gave me plenty to ponder on. For the record, I changed the Camshaft Position Sensor and VCT solenoid and neither has worked so far.”View original
“For the record, I changed the Camshaft Position Sensor and VCT solenoid and neither has worked so far. Here's the codes I got: P0172 Bank 1 too rich P0174 Bank 2 too lean P0300 Random Misfire P0302 Misfire Cyl 2 P0303 Misfire Cyl 3 P0304 Misfire Cyl 4 P0340 Cam Sensor Bank A P0344 Cam sensor intermittent P2916 O2 sensor stuck rich B1S1 P0138 O2 circuit high voltage B1S2 Obviously, I have a feeling that it's the O2 sensors, but why would both sensors go bad at the same time?”View original
“Has anybody every had a p0174 code due to a faulty or clogged injector. I have checked the MAF all the vacum line's and done the water test on the intake with no change so im now thinking a bad or faulty injector.”View original
“P0174 - System to Lean (Bank 2) The Adaptive Fuel Strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.”View original
“Some things for you to look at P0174 - System to Lean (Bank 2) The Adaptive Fuel Strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.”View original
“P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.”View original
“The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information.”View original
“CHURCH Look at the video that Andy suggested So as to not repeat myself also check the attached link and look at the information I posted and the link I posted in that thread.”View original
“I have checked the MAF all the vacum line's and done the water test on the intake with no change so im now thinking a bad or faulty injector. Any thoughts??”View original
“Well you kind of made my point for me p0174 is specific to bank 2 so I should be able v to rule out the MAF PVC egr fuel filter so I have to look at things that would just effect 1 side and not the other side like injectors or vacuum leaks, the problem also does come down alot when the speed increases so I'm thinking a leak I just v haven't found it yet might have to smoke test it.”View original
These are real experiences shared by 2020 FORD Expedition owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 8 discussions about P0174 from 2020 FORD Expedition owners across automotive communities.
Success rate (0%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 4/11/2017