p0135
Easy Fix
Honda · Sedans
O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1
Quick Answer
Error code P0135 on your Honda Sedans means: O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CV3CV4FC1FC4FE1FL5ZC5Accord EX 2024Accord EX-L 2024Accord Hybrid EX-L 2024Accord Hybrid Sport 2024Accord Hybrid Touring 2024Accord LX 2024Accord Sport 2024Accord Touring 2024Civic EX 2024Civic Hybrid Sport 2025Civic Hybrid Sport Touring 2025Civic LX 2024Civic Si 2024Civic Sport 2024Civic Touring 2024Civic Type R 2024ZE4
Likely Causes
How to Fix It
1
Check the O2 sensor heater fuse in the under-hood fuse box and replace if blown
2
Measure the O2 sensor heater circuit resistance at the sensor connector (typically 10-16 ohms for Honda sensors)
3
Verify battery voltage is present at the heater power wire with the key on
4
Inspect the O2 sensor connector for melted, corroded, or bent pins
5
Replace the oxygen sensor if the heater element resistance is open or out of specification
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Upstream oxygen sensor (Bank 1, Sensor 1)
O2 sensor heater fuse
Wiring repair connectors
O2 sensor connector pigtail
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