how to fix P0174 code in Toyota Corolla E170 (2013-2019)

• •Check engine light illuminated
• •Rough idle or instability during idling
• •Decreased engine power during acceleration
• •Poor fuel economy
• •Engine stalling or hesitation
• •Increased emissions

1. 1Scan the vehicle's computer using an OBD-II scanner to confirm the P0174 code and check for any additional codes.
2. 2Inspect the air intake system for leaks, including hoses and the intake manifold, ensuring there are no cracks or loose connections.
3. 3Check the fuel pressure using a fuel pressure gauge to ensure it meets the manufacturer's specifications.
4. 4Inspect the Mass Air Flow (MAF) sensor for dirt or damage; clean or replace as necessary.
5. 5Examine the oxygen sensors and their wiring for faults or damage that could lead to incorrect readings.
6. 6Check the engine’s vacuum lines for leaks that could cause a lean condition.

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

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

• •OBD-II scanner
• •Pliers
• •Torque wrench
• •Fuel pressure gauge
• •MAF cleaner
• •Oxygen sensor socket

• •Replacement vacuum hoses
• •MAF sensor (if needed)
• •Fuel filter (if needed)
• •Oxygen sensors (if needed)