p1155
Moderate
Toyota · Sedans
Air/Fuel Sensor Heater Circuit Response Bank 2 Sensor 1
Quick Answer
Error code P1155 on your Toyota Sedans means: Air/Fuel Sensor Heater Circuit Response Bank 2 Sensor 1. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Avalon XLE 2022Camry XSE 2024Camry Hybrid SE 2024Corolla SE 2024Corolla Hybrid LE 2024Crown Platinum 2024Mirai Limited 2024Prius XLE 2024Camry LE 2023Camry LE 2024Camry SE 2023Camry SE 2024Camry TRD 2024Camry XLE 2024Corolla LE 2023Corolla LE 2024Corolla XSE 2024Crown Limited 2024Crown XLE 2024Prius LE 2024Prius Limited 2024
Likely Causes
How to Fix It
1
Check the A/F sensor heater fuse and relay in the fuse box
2
Measure the Bank 2 Sensor 1 heater element resistance and compare to specification
3
Inspect the wiring from the ECM to the Bank 2 Sensor 1 connector for opens or shorts
4
Check for water intrusion or corrosion at the sensor connector
5
Replace the air/fuel ratio sensor if heater resistance is out of range
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Air/fuel ratio sensor (Bank 2 Sensor 1)
Sensor heater fuse
Wiring harness repair connector
Dielectric grease for connector
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