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Engine-Codes - Nissan - P0174 NISSAN

P0174 NISSAN - Fuel Injection System Too Lean Bank 2

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P0174 NISSAN Possible Causes

What does this mean?
  • 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 is the P0174 NISSAN code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

What does this mean?
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

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













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What is the cost to diagnose the P0174 NISSAN code

Labor: 1.0

The cost to diagnose the P0174 NISSAN code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Excessive Fuel Consumption

P0174 NISSAN Meaning

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. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
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.)

More Information

Need more information on how to fix the P0174 NISSAN code?
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Information for specific Nissan models

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