Where is the sensor code P1155 in rav4 2001?

The P1155 code for a 2001 Toyota RAV4 indicates an issue with the air-fuel ratio sensor, specifically related to its heater circuit. This sensor is typically located in the exhaust system, before the catalytic converter. To access it, you may need to look under the vehicle, near the engine's exhaust manifold. If you're troubleshooting, it's advisable to check the wiring and connections to the sensor for any faults.