how to fix P0171 code in Toyota Camry Eighth Generation (2018-present)?

Solution

1. Preparation

• Gather necessary tools and safety equipment.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, basic hand tools.
• Visually inspect all vacuum hoses and connections for cracks or disconnections.
• Use a vacuum gauge to check for expected readings; replace any faulty hoses.
• Reconnect any loose connections and ensure a secure fit.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver set.
• Locate the MAF sensor, usually between the air filter and throttle body.
• Remove the MAF sensor carefully, avoiding damage to the wiring.
• Clean the sensor using MAF cleaner; do not touch the sensor element.
• If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel System

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition on (do not start the engine) and check the fuel pressure against manufacturer specifications.
• If the pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or failures.
• Replace any faulty components as necessary.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter.
• Locate the upstream oxygen sensor on the exhaust manifold.
• Use the O2 sensor socket to remove the sensor.
• Test the sensor's resistance and voltage output with a multimeter; replace if out of specifications.