why does my Toyota Camry Eighth Generation (2018-present) have a check engine light and P0171 code

Solution

1. Preparation

• Gather all necessary tools and parts before beginning.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Repair Air Intake

• Tools Required: Screwdriver set, vacuum gauge
• Check the air filter and replace it if it is dirty.
• Inspect all intake hoses for cracks or loose connections; replace or tighten as necessary.
• If a leak is found, repair or replace the damaged component.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner, soft cloth
• Remove the MAF sensor from the intake duct.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstalling.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, basic hand tools
• Connect the fuel pressure gauge to the fuel rail and start the engine.
• Check that the fuel pressure is within specifications (typically around 40-50 psi for most vehicles).
• If pressure is low, inspect the fuel pump and fuel filter for clogs or failure.
• If injectors are suspected to be clogged, use fuel injector cleaner or replace them.

5. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (optional)
• Perform a vacuum leak test using a vacuum gauge or smoke test.
• Locate and repair any vacuum leaks found in hoses or gaskets.

6. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0171 code and check for any new codes after repairs.