p0134
Easy Fix
Honda · Sedans
O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1
Quick Answer
Error code P0134 on your Honda Sedans means: O2 Sensor Circuit No Activity Detected 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 fuse in the under-hood fuse box; replace if blown
2
Inspect the upstream O2 sensor connector and wiring for damage, corrosion, or rodent chews
3
Monitor the Bank 1 Sensor 1 voltage with a scan tool at idle; it should oscillate between 0.1V and 0.9V
4
Check for exhaust leaks at the exhaust manifold and header connections
5
Replace the upstream oxygen sensor if the signal is flat or not switching
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 wiring harness
Exhaust manifold gasket
O2 sensor fuse
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