E171 For Mac

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Repair Difficulty Level: 3/3What is this?

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Table of contents

P0171 Possible Causes

  • 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 P0171 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

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.



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What is the cost to diagnose the P0171 code

Labor: 1.0

The cost to diagnose the P0171 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour. How much do you know about cars?

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When is the code detected?

- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

Possible Symptoms

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

P0171 Meaning

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely 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 E171 for macbook proECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).

More Information

Need more information on how to fix the P0171 code?
Get Access to Factory Service Manuals

Information for specific makes

  • P0171 ACURAFuel Injection System Too Lean Bank 1
  • P0171 AUDISystem Too Lean Bank 1
  • P0171 BMWMixture Control System Too Lean
  • P0171 BUICKFuel Trim System Lean Bank 1
  • P0171 CADILLACFuel Trim System Lean Bank 1
  • P0171 CHEVROLETFuel Trim System Lean Bank 1
  • P0171 CHRYSLERFuel System 1/1 Lean
  • P0171 DODGEFuel System 1/1 Lean
  • P0171 FORDFuel Injection System Too Lean Bank 1
  • P0171 GMCFuel Trim System Lean Bank 1
  • P0171 HONDAFuel Injection System Too Lean Bank 1
  • P0171 HUMMERFuel Trim System Lean Bank 1
  • P0171 HYUNDAISystem Too Lean Bank 1
  • P0171 INFINITIFuel Injection System Too Lean Bank 1
  • P0171 ISUZUFuel Trim System Lean Bank 1
  • P0171 JAGUARSystem Too Lean Bank 1
  • P0171 JEEPFuel System 1/1 Lean
  • P0171 KIABank 1 System Too Lean
  • P0171 LAND-ROVERSystem Too Lean Bank 1
  • P0171 LEXUSAir/Fuel Mixture System Lean Bank 1
  • P0171 LINCOLNFuel Injection System Too Lean Bank 1
  • P0171 MAZDALean Air/Fuel Ratio Bank 1
  • P0171 MERCEDES-BENZSystem Too Lean Bank 1
  • P0171 MERCURYFuel Injection System Too Lean Bank 1
  • P0171 MINIMixture Control System Too Lean
  • P0171 MITSUBISHISystem Too Lean Cylinders 1-4
  • P0171 NISSANFuel Injection System Too Lean Bank 1
  • P0171 OLDSMOBILEFuel Trim System Lean Bank 1
  • P0171 PONTIACFuel Trim System Lean Bank 1
  • P0171 SAABSystem Too Lean Bank 1
  • P0171 SATURNFuel Trim System Lean Bank 1
  • P0171 SCIONAir/Fuel Mixture System Lean Bank 1
  • P0171 SUBARUSystem Too Lean Bank 1
  • P0171 SUZUKISystem Too Lean Bank 1
  • P0171 TOYOTAAir/Fuel Mixture System Lean Bank 1
  • P0171 VOLKSWAGENSystem Too Lean Bank 1

E171 For Mac Os

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