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L
p1155
Moderate
Lexus · Sedans
Oxygen Sensor Circuit Response Bank 2
Quick Answer
Error code P1155 on your Lexus Sedans means: Oxygen Sensor Circuit Response Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
AXVA60AXVA65GSVA60AVE30GSE30GSE35GVFA20GVFA25GSC10
Likely Causes
  1. Faulty oxygen sensor
  2. Wiring damage or corrosion
  3. Loose sensor connection
  4. Engine running too rich or lean
  5. Exhaust leak near sensor
How to Fix It
1
Locate Bank 2 oxygen sensor
2
Inspect sensor condition and wiring
3
Test sensor voltage with oscilloscope
4
Check for exhaust leaks
5
Replace oxygen sensor if faulty
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
Oxygen sensor
Sensor socket tool
Dielectric grease
Related Error Codes
P0171P0300P0420P0441P0442
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