how to diagnose a P0135 code on my Honda Accord 8th Generation (2008-2012)?

• •Check engine light illuminated
• •Poor fuel economy
• •Rough engine idle
• •Increased emissions
• •Hesitation during acceleration

1. 1Scan the vehicle's onboard computer using an OBD-II scanner to confirm the P0135 code and check for any additional codes.
2. 2Inspect the wiring and connectors leading to the upstream oxygen sensor for any visible damage, corrosion, or loose connections.
3. 3Measure the resistance of the heater element in the oxygen sensor using a multimeter to ensure it is within the manufacturer's specifications.
4. 4Check the voltage at the oxygen sensor connector with the ignition on (engine off) to verify that the heater circuit is receiving power.
5. 5Inspect the vehicle's fuse box for any blown fuses related to the oxygen sensor heater circuit.
6. 6If necessary, perform a continuity test on the wiring from the ECU to the oxygen sensor connector to ensure there are no breaks in the circuit.

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
• •Multimeter
• •Socket set
• •Wire brush
• •Electrical cleaner
• •Heat shrink tubing

• •New upstream oxygen sensor
• •Electrical connectors (if needed)