FAULTBASE
NEWSASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/Genesis/G70/IG (2017-2023)/how to fix P0171 code in Genesis G70 IG (2017-2023)

how to fix P0171 code in Genesis G70 IG (2017-2023)

Genesis G70 IG (2017-2023)

Severity: highDifficulty: mediumError Code: P01712-4 hours
4 min read
666 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0171 engine lean condition in Genesis G70 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0171
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems to prevent shocks.
  • ⚠Allow the engine to cool before working on any components.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or stalling
  • •Poor acceleration or loss of power
  • •Decreased fuel economy
  • •Engine misfires
  • •Increased emissions

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm the P0171 code.
  2. 2Inspect the air intake system for any vacuum leaks or damaged hoses.
  3. 3Check the mass air flow (MAF) sensor for proper operation and cleanliness.
  4. 4Inspect the fuel delivery system, including fuel pressure and fuel injectors.
  5. 5Examine the exhaust system for leaks that may affect the oxygen sensors.
  6. 6Verify the operation of the oxygen sensors using a multimeter.

Solution

Solution

1. Preparation

  • Gather necessary tools and safety equipment.
  • Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

  • Tools Required: Socket set, screwdrivers
  • Inspect the air intake hose and connectors for any signs of wear or damage.
  • Tighten or replace any loose or damaged hoses.
  • Check for any vacuum leaks by spraying a small amount of carburetor cleaner around the intake manifold while the engine is running. If the RPM increases, a leak is present.
  • Replace any damaged vacuum lines or components.

3. Clean or Replace Mass Air Flow Sensor

  • Tools Required: MAF cleaner, Torx wrench
  • Remove the MAF sensor from the air intake duct.
  • Spray MAF cleaner onto the sensor element to remove dirt and debris.
  • Allow the sensor to dry completely before reinstallation.
  • If the sensor is damaged, replace it with a new one.

4. Check Fuel Delivery System

  • Tools Required: Fuel pressure gauge
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition key to the "ON" position without starting the engine to check the fuel pressure.
  • Compare the reading to the manufacturer specifications (typically 40-60 psi).
  • If pressure is low, check the fuel pump and fuel filter for issues. Replace as necessary.

5. Inspect and Replace Oxygen Sensors

  • Tools Required: O2 sensor socket, torque wrench
  • Remove the upstream oxygen sensor from the exhaust manifold.
  • Inspect the sensor for signs of damage or contamination.
  • If necessary, replace the oxygen sensor with a new one, ensuring it is torqued to manufacturer specifications (typically 30-40 ft-lbs).

6. Reconnect Battery and Clear Codes

  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0171 code and other related codes.
  • Start the engine and allow it to reach operating temperature.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Socket set
  • Screwdrivers
  • Fuel pressure gauge
  • MAF cleaner
  • O2 sensor socket
  • Torque wrench

Parts Required

  • Mass air flow sensor (if needed)
  • Oxygen sensor (if needed)
  • Fuel filter (if needed)
  • Vacuum hoses (if damaged)

Additional Information

Error CodeP0171
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

7 items

Parts

4 items

Related Faults

Discover similar issues

  1. why does my Genesis G70 brake pedal feel soft

    Learn how to diagnose and fix a soft brake pedal in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

    Component:Brakes
    Symptoms
    • •Soft or spongy brake pedal feel when depressed
    • •Longer stopping distances
    • +{count} more
  2. why does my Genesis G70 have excessive engine noise at startup?

    Learn how to diagnose and fix excessive engine noise at startup in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

    Component:Engine
    Symptoms
    • •Loud knocking or tapping noise from the engine
    • •Noise persists for several seconds after startup
    • +{count} more
  3. my Genesis G70 AC compressor is making noise, what's wrong

    Learn how to diagnose and fix AC compressor noise in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

    Component:HVAC
    Symptoms
    • •Unusual grinding or squealing noise from the AC compressor
    • •Intermittent cooling or lack of cold air from the AC
    • +{count} more
  4. why does my Genesis G70 engine sound rough after warming up

    Learn how to diagnose and fix a rough engine sound in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

    Component:Engine
    Symptoms
    • •Rough engine idle
    • •Increased engine noise when warmed up
    • +{count} more
  5. why does my Genesis G70 overheat in traffic but not on the highway?

    Learn how to diagnose and fix overheating issues in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

    Component:Cooling System
    Symptoms
    • •Engine temperature gauge rises significantly in traffic
    • •Coolant temperature warning light illuminated
    • +{count} more
  6. my Genesis G70 has a coolant leak what should I check

    Learn how to diagnose and fix coolant leaks in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

    Component:Cooling System
    Symptoms
    • •Coolant level dropping in the reservoir
    • •Visible coolant puddles under the vehicle
    • +{count} more

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation