P0141 2015 Toyota RAV4 Code - Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 2

P0141 indicates an issue with the oxygen sensor heater circuit for Bank 1 Sensor 2, which is the downstream oxygen sensor responsible for monitoring catalytic converter efficiency.

Symptoms may include an illuminated check engine light, decreased fuel efficiency, and potentially increased emissions, though drivability is often unaffected.

Common causes include a failed oxygen sensor heater, damaged wiring or connectors, a blown fuse, or a malfunction in the engine control module (ECM).

Start by inspecting the wiring and connectors around the Bank 1 Sensor 2 oxygen sensor for damage or corrosion, then test the sensor’s resistance and heater circuit using a multimeter.

While the vehicle is usually drivable, ignoring the code can lead to increased emissions and fuel consumption, so it’s best to address the issue promptly.

Common fixes include replacing the Bank 1 Sensor 2 oxygen sensor, repairing damaged wiring, replacing a blown fuse, or addressing a fault in the ECM.

Replacing the oxygen sensor typically costs between $150 and $300, including parts and labor, though costs may vary based on location and repair shop.

Yes, a blown fuse in the oxygen sensor heater circuit can trigger the P0141 code, so checking and replacing the fuse if necessary is a good starting point.

Not necessarily. The code specifically relates to the heater circuit for the downstream oxygen sensor, not the catalytic converter itself.

Regular maintenance, such as inspecting wiring for damage and ensuring oxygen sensors are in good condition, can help prevent this code from reappearing.