P0174 Nissan Code - Fuel Injection System Too Lean Bank 2
Quick Answer
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closer to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0174 Nissan indicates Fuel Injection System Too Lean Bank 2.
- Common causes
- Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0174 Nissan Description
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).
The Diagnostic Trouble Code (DTC) will set when the Fuel Injection system does not operate properly or the amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
What are the Possible Causes of the DTC P0174 Nissan?
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
How to Fix the DTC P0174 Nissan?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
There are factory service bulletins for the following Nissan models:
2004 Maxima (A34) with 5 speed A/T only
2004 Quest (V42) with 5 speed A/T only
2004 Nissan Maxima, Quest Factory Service Bulletin OBDII Code P0174
2004 Maxima (A34) with 4-speed A/T and 6-speed M/T
2004 Quest (V42) with 4-speed A/T
2004 Nissan Maxima, Quest Factory Service Bulletin OBDII Code P0174
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0174 Nissan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0174 Nissan code?
Need more information on how to fix the P0174 Nissan code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0174 Nissan code diagnosed by a professional: Find a repair shop in your area
Information for Specific Nissan Models
- P0174 2002 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2003 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2004 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2005 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2006 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2008 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2009 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2010 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2011 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2012 Nissan Altima Sedan — Fuel Injection System Too Lean Bank 2
- P0174 2004 Nissan Maxima — Fuel Injection System Too Lean Bank 2
- P0174 2005 Nissan Maxima — Fuel Injection System Too Lean Bank 2
- P0174 2006 Nissan Maxima — Fuel Injection System Too Lean Bank 2
- P0174 2007 Nissan Maxima — Fuel Injection System Too Lean Bank 2
- P0174 2008 Nissan Maxima — Fuel Injection System Too Lean Bank 2
- P0174 2005 Nissan Pathfinder — Fuel Injection System Too Lean Bank 2
- P0174 2006 Nissan Pathfinder — Fuel Injection System Too Lean Bank 2
- P0174 2007 Nissan Pathfinder — Fuel Injection System Too Lean Bank 2
- P0174 2008 Nissan Pathfinder — Fuel Injection System Too Lean Bank 2
- P0174 2009 Nissan Pathfinder — Fuel Injection System Too Lean Bank 2
- P0174 2010 Nissan Pathfinder — Fuel Injection System Too Lean Bank 2
- P0174 2011 Nissan Pathfinder — Fuel Injection System Too Lean Bank 2
- P0174 2012 Nissan Pathfinder — Fuel Injection System Too Lean Bank 2
- P0174 2002 Nissan Sentra — Fuel Injection System Too Lean Bank 2
- P0174 2007 Nissan Sentra — Fuel Injection System Too Lean Bank 2
- P0174 2008 Nissan Sentra — Fuel Injection System Too Lean Bank 2
- P0174 2009 Nissan Sentra — Fuel Injection System Too Lean Bank 2
- P0174 2010 Nissan Sentra — Fuel Injection System Too Lean Bank 2
- P0174 2011 Nissan Sentra — Fuel Injection System Too Lean Bank 2
- P0174 2012 Nissan Sentra — Fuel Injection System Too Lean Bank 2
Frequently Asked Questions about P0174 Nissan Code
1. What are common symptoms of OBDII code P0174 (Fuel Injection System Too Lean Bank 2) in a Nissan?
- Common symptoms include rough idle, engine misfires, loss of power, and an increase in fuel consumption.
2. What are the potential causes of OBDII code P0174 in a Nissan?
- Causes may include a vacuum leak, faulty oxygen sensor, clogged fuel filter, fuel injector issues, or a malfunctioning mass airflow sensor.
3. How can I diagnose the OBDII code P0174 in my Nissan?
- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking for vacuum leaks, inspecting the oxygen sensor, testing the fuel pressure, and examining the mass airflow sensor.
4. Can a dirty air filter trigger the OBDII code P0174 in a Nissan?
- Yes, a dirty air filter can disrupt the air-fuel mixture and lead to a lean condition, potentially triggering the P0174 code.
5. How should I address the OBDII code P0174 in my Nissan?
- Start by checking for any visible issues like vacuum leaks, then proceed to inspect and potentially replace components such as the oxygen sensor, fuel filter, or mass airflow sensor as needed.
6. Is it safe to continue driving my Nissan with the OBDII code P0174 present?
- It is not recommended to drive for an extended period with the P0174 code as it can lead to poor engine performance and potential damage if left unresolved.
7. Can bad gasoline quality cause the OBDII code P0174 in a Nissan?
- Poor quality gasoline or contaminated fuel can contribute to the P0174 code by affecting the air-fuel mixture and causing a lean condition.
8. Will resetting the OBDII code P0174 in my Nissan make the issue disappear permanently?
- Simply resetting the code will not resolve the underlying problem causing the lean condition. It may temporarily clear the code, but the issue will likely reoccur without proper diagnosis and repair.
9. Are there specific maintenance tips to prevent the OBDII code P0174 in a Nissan?
- Regularly changing the fuel filter, keeping the air filter clean, using quality gasoline, and performing routine engine maintenance can help prevent issues leading to the P0174 code.
10. Can a faulty fuel pump contribute to the OBDII code P0174 in a Nissan?
- Yes, a failing fuel pump can result in inadequate fuel delivery, causing a lean condition and potentially triggering the P0174 code in a Nissan.
Discuss the causes and fixes for P0174 Nissan OBDII Code
-
Just got the 07 altima3.5 for my son check engine light come on. The car seems to have a little miss when idling the code says po174 took it to carlot they cleaned the oxygen sensor and cleared the light but it come back on doing same thing
-
Start by checking for intake leaks. If no leaks are found, then the next step is to clean the Mass Air Flow (MAF) sensor and replace the air filter. If the problem persist, then you may have to replace the Oxygen sensor.
-
hi, I have a 2010 Murano that has an excesive fuel consumption it feels like I force it when driving and overheat when going into a high slope for which the speed goes down to 10mph until it cools down, the car makes a lot of effort entering into my garage in reverse because it has little sloepe and at last it smells like burn.
I was told it could be the transmission which I confirm its working ok and a new transmission cooler was installed a new , the catalyst has been replace but I still have the problem and the P0174 code with the service engine soon sign on my car, can anyone help me? thank you! -
Looking for suggestions: I've got an 02 Nissan Maxima that began with a P1168 code for the MAF. I've cleaned the MAF and checked/tested it with a volt/ohm meter as best I know how. I'm seeing around 1.4V at idle and see it go up to around 3.0V when revving the engine so I think the MAF is fine. I tested for intake air leaks by spraying carb cleaner on everything I could think of being suspect and found no change in idle at all. I just swapped out the Bank 2 Sensor 1 O2 sensor thinking that might be causing the issue. Not sure if the sensor I put in is good or not.....just testing to see what happened. A short test drive brought up the latest P0174 code but not the P1168. Any other suggestions other than replacing the O2 sensor? Thanks.
-
The MAF and vacuum leaks are the most common causes for P0174 code, but for the P1168 code, you more than likely have to replace the O2 sensor.
Did you clear the "Mixture Ratio Self-Learning Control" after swapping the sensor? if you didn't thats why you probably got a different code.
After you replace the O2 sensor, make sure you clear the "Mixture Ratio Self-Learning Control"Instructions here: https://nissanhelp.com/diy/...
-
Thanks. I wasn't aware of that procedure. I'll follow it and give it a shot. If all else fails then I think I'll replace both of my upstream O2 sensors. I think I had replaced both bank 1 and bank 2 upstream sensors with universal fit replacements a few years ago. I never trusted them to begin with. I think I'll go with better quality OE fit model O2 sensors this time. Once again, thanks for your quick response and assistance!
-
I have an 09 maxima. Had both catalytic converters replaced along with MAF sensor and o2 sensor. Code p1074 is still showing. Had vehicle smoke tested for any air leaks which there were none and now am confused as to what the real problem is. Any suggestions or comments?
-
The P0174 code means that there is more air than fuel during the engine combustion. The MAF and O2 Sensors are the most common solutions for the P0174, but the next step is to find why there is more air than fuel. Either the fuel injectors are clogged, or somehow more air than what is required is entering the engine. There are a couple of incidents where the problem was the PCV valve. I recommend using fuel injector cleaner, along with high octane gas and if possible changing the PCV valve.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
