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I recently install two 02 sensor and replace the EFI fuse relay on a 2001 Lexus is300. I am still getting an error code P0155. I clean the code several times. Can help to find a solution to the problem?
 

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2002 Lexus IS300
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That code is for the bank 2 UPSTREAM (before the Catalyst) O2 sensor HEATER CIRCUIT.

You have 1 or more things to double check:

1. you replaced a different sensor (there are 4 total) than that one then you will still get the code.

2. If you bought a universal O2 sensor there is a possibility that the wires could have gotten mixed up when splicing them.

3. If you replaced the correct one with an EBAY off brand Sensor then it’s possible that it’s defective.

4. short somewhere in the heater circuit wiring (normally the two black wires on the sensor)
 
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