how to fix P0174 code in Honda Accord 10th Generation (2018-2022)

Honda Accord 10th Generation (2018-2022)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0174

4 min read

606 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 lean condition in Honda Accord 10th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0174

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the fuel system.

Symptoms

•Check engine light illuminated
•Rough idle or stalling
•Poor acceleration or loss of power
•Decreased fuel economy
•Increased emissions
•Unusual engine noises (e.g., backfiring)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0174 code and check for any related codes.
2
Inspect the air intake system for vacuum leaks, including hoses and gaskets.
3
Check the fuel system for proper fuel pressure using a fuel pressure gauge.
4
Inspect the mass air flow (MAF) sensor for dirt or damage and test its operation.
5
Examine the fuel injectors for clogs or malfunctions.
6
Inspect the throttle body for carbon buildup or obstructions.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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
•Vacuum gauge
•Fuel pressure gauge
•MAF sensor cleaner
•Socket set
•Screwdrivers

Parts Required

•Vacuum hoses (if damaged)
•MAF sensor (if faulty)
•Fuel injectors (if clogged or malfunctioning)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0174 code and check for any related codes.
2
Inspect the air intake system for vacuum leaks, including hoses and gaskets.
3
Check the fuel system for proper fuel pressure using a fuel pressure gauge.
4
Inspect the mass air flow (MAF) sensor for dirt or damage and test its operation.
5
Examine the fuel injectors for clogs or malfunctions.
6
Inspect the throttle body for carbon buildup or obstructions.

Solution

1. Preparation

Gather tools and parts.
Disconnect the negative battery terminal to prevent electrical shorts.
Allow the engine to cool down.

2. Inspect and Repair Vacuum Leaks

Tools Required: Vacuum gauge, hose clamps, screwdrivers.
Visually inspect all vacuum hoses connected to the intake manifold and replace any damaged hoses.
Use a vacuum gauge to check for leaks; if any leaks are found, repair or replace the affected components.

3. Clean or Replace MAF Sensor

Tools Required: MAF sensor cleaner, Torx screwdriver.
Detach the MAF sensor from the air intake duct.
Spray the MAF sensor with MAF cleaner and let it dry completely before reinstalling.
If the sensor is damaged, replace it with a new one.

4. Check Fuel System

Tools Required: Fuel pressure gauge, socket set.
Connect the fuel pressure gauge to the fuel rail.
Turn the ignition on (do not start the engine) and check the fuel pressure; it should meet manufacturer specifications (usually around 40-50 psi).
If the pressure is low, inspect the fuel pump and fuel filter for faults and replace as necessary.

5. Inspect Fuel Injectors

Tools Required: Injector cleaning kit or replacement injectors.
Remove the fuel rail to access the fuel injectors.
Check for clogs or leaks; if necessary, clean the injectors with a cleaning kit or replace them if they are malfunctioning.

6. Reconnect and Reset

Reconnect all components and ensure everything is securely fastened.
Reconnect the negative battery terminal.
Use the OBD-II scanner to clear the P0174 code from the ECM.