FAULTBASE
NEWSASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/Toyota/Camry/Eighth Generation (2018-present)/how to fix P0174 code in Toyota Camry Eighth Generation (2018-present)

how to fix P0174 code in Toyota Camry Eighth Generation (2018-present)

Toyota Camry Eighth Generation (2018-present)

Severity: highDifficulty: mediumError Code: P01742-4 hours
3 min read
581 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 P0174 engine too lean issue in Toyota Camry. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0174
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect battery before working on electrical systems.
  • ⚠Allow the engine to cool before opening any components to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or stalling
  • •Decreased engine performance or acceleration
  • •Poor fuel economy
  • •Unusual hissing noises from the engine bay

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm the P0174 code and check for any additional codes.
  2. 2Inspect the intake system for vacuum leaks, including hoses, gaskets, and the intake manifold.
  3. 3Check fuel pressure using a fuel pressure gauge to ensure it meets specifications.
  4. 4Inspect the Mass Air Flow (MAF) sensor for dirt or malfunction.
  5. 5Verify the operation of the fuel injectors by checking their electrical connections and resistance.
  6. 6Review the air filter condition and replace it if clogged.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the battery to prevent electrical shorts.
  • Allow the engine to cool before starting work.

2. Inspect and Repair Vacuum Leaks

  • Tools Required: Visual inspection tools, smoke machine (if available).
  • Inspect all vacuum hoses and connections for cracks or disconnections.
  • If vacuum leaks are found, replace the damaged hoses or reattach any loose connections.

3. Clean or Replace MAF Sensor

  • Tools Required: Torx screwdriver, MAF cleaner.
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the sensor using MAF cleaner and allow it to dry completely. If damaged, replace the MAF sensor.
  • Reinstall the sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

  • Tools Required: Fuel pressure gauge.
  • Locate the fuel pressure test port on the fuel rail.
  • Attach the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine. Check the pressure reading against manufacturer specifications.
  • If the pressure is low, inspect the fuel pump and filter for faults and replace if necessary.

5. Inspect Fuel Injectors

  • Tools Required: Multimeter, injector cleaner.
  • Disconnect the electrical connectors from each fuel injector.
  • Use a multimeter to check the resistance of each injector; it should be within the manufacturer's specifications.
  • If an injector is faulty, replace it. Consider cleaning the injectors with a professional cleaning kit if they appear dirty.

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
  • Fuel pressure gauge
  • Multimeter
  • Torx screwdriver
  • MAF cleaner
  • Injector cleaner kit

Parts Required

  • Vacuum hoses (if damaged)
  • MAF sensor (if faulty)
  • Fuel pump (if pressure is low)
  • Fuel injectors (if faulty)

Additional Information

Error CodeP0174
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

6 items

Parts

4 items

Related Faults

Discover similar issues

  1. Why is my Toyota Camry XV70 making a grinding noise during braking?

    Learn how to diagnose and repair grinding noise during braking in your Toyota Camry XV70. Step-by-step instructions and required tools included.

    Component:brake system
    Symptoms
    • •Grinding noise when applying brakes
    • •Noise may increase with speed or braking force
    • +{count} more
  2. How can I fix the key fob not working in my 2019 Toyota Camry?

    Learn how to diagnose and fix a non-working key fob for your 2019 Toyota Camry with step-by-step instructions.

    Component:key fob
    Symptoms
    • •Key Fob Not Responding
    • •No Response from Vehicle
    • +{count} more
  3. How can I resolve issues with the backup camera not functioning in my Camry?

    Learn how to diagnose and fix backup camera issues in your Toyota Camry (2018-present) with these detailed steps.

    Component:backup camera
    Symptoms
    • •No image displayed when shifting into reverse.
    • •A distorted or static image.
    • +{count} more
  4. What are the signs of a failing catalytic converter in a Toyota Camry XV70?

    P0420, P0430

    Learn about the symptoms, diagnostic steps, and repair instructions for a failing catalytic converter in the Toyota Camry XV70 (2018-present).

    Component:catalytic converter
    Symptoms
    • •Check Engine Light (CEL)
    • •Decreased Engine Performance
    • +{count} more
  5. What should I do if my 2020 Toyota Camry displays a "Low Battery" warning?

    Learn how to diagnose and resolve the 'Low Battery' warning in your 2020 Toyota Camry with step-by-step instructions and required tools.

    Component:battery
    Symptoms
    • •Dashboard warning light indicating 'Low Battery.'
    • •Difficulty starting the engine or slow cranking.
    • +{count} more
  6. Why is there a delay in acceleration in my 2018 Toyota Camry?

    Learn how to diagnose and fix the delay in acceleration issue for your 2018 Toyota Camry with our step-by-step guide.

    Component:Throttle Body, Throttle Position Sensor, Transmission, Fuel System
    Symptoms
    • •Noticeable lag or delay when pressing the accelerator pedal.
    • •Engine RPMs do not increase immediately in response to pedal input.
    • +{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