Have Toyota Questions? Ask a Mechanic for Answers ASAP
I'm sorry the Tech you requested was unavailable to assist you today. It appears that Tech is currently "Offline". Now that his 15 minute "request lock" has expired, hopefully I can be of some assistance in his place...The P1155 is a very straight forward code pointing to a problem with the A/F Sensor for Bank2. If you have a sensor that has a rubber grommet on it, it sounds like you have Bank1/Sensor2, which is the wrong sensor. The sensor you want with the P1155 is mounted to the exhaust manifold on the side of the engine closest to the front of the vehicle (click here for a location view image). Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the visual inspection checks ok, replacing the sensor will solve the problem. These are actually fairly common wear and tear fail items. Please do the right thing and remember to leave a rating using the rating system at the top of this page or accept the answer so I may be credited for this Q&A. You can ask follow-up questions any time, even after you rate or accept.