why does my Honda Accord have a check engine light and P0131 code

• •Check engine light illuminated
• •Poor fuel economy
• •Rough idle
• •Engine stalling or hesitation during acceleration
• •Failed emissions test
• •Increased exhaust emissions

1. 1Scan the vehicle's OBD-II system to confirm the P0131 code and check for any additional codes.
2. 2Inspect the wiring and connectors for the upstream oxygen sensor for signs of damage, corrosion, or loose connections.
3. 3Measure the voltage output from the oxygen sensor using a multimeter to verify if it is within the expected range.
4. 4Check the fuel trim readings to assess if the engine is running rich or lean.
5. 5Inspect the exhaust system for leaks that may affect oxygen sensor readings.
6. 6Review the vehicle's maintenance history to ensure the air filter and fuel system are not restricted.

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
• •Oxygen sensor socket or wrench
• •Multimeter
• •Torque wrench
• •Wire brush

• •New upstream oxygen sensor (Bank 1, Sensor 1)