P0171 2005 TOYOTA PRIUS - Air/Fuel Mixture System Lean Bank 1
P0171 2005 TOYOTA PRIUS Possible Causes
- Intake air leaks
- Faulty front heated oxygen sensor
- EFI M relay
- Engine coolant temperature 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 do I fix code P0171 2005 TOYOTA PRIUS?Check 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.
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Cost of diagnosing the P0171 2005 TOYOTA PRIUS code
Labor: 1.0The cost of diagnosing the P0171 2005 TOYOTA PRIUS code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
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.)
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0171 2005 TOYOTA PRIUS DescriptionWith 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 ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).
More InformationNeed more information on how to fix the P0171 2005 TOYOTA PRIUS code?
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Need more help?Get the P0171 2005 Toyota Prius code diagnosed by a professional: Find a repair shop in your area
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