Failed heater element inside the Bank 2 Sensor 3 oxygen sensor; Damaged, chafed or corroded wiring to the sensor heater circuit; Corroded, loose or contaminated sensor connector; Blown fuse or faulty relay supplying the heater circuit; Exhaust leak or heat damage near the sensor affecting the sensor or its harness; Fault in the control unit heater driver circuit.

P0061

HO2S Heater Resistance Bank 2 Sensor 3.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
61: FaultThe specific fault in that area

What it means

P0061 means the control unit has found the heater circuit resistance of the heated oxygen sensor on Bank 2, Sensor 3 to be outside the expected range. Sensor 3 is normally a further downstream sensor, fitted after the second sensor on that bank. The control unit checks the heater element's resistance or electrical performance and sets the code when the reading is out of specification. Sensor layout varies between models, so confirm which sensor is Bank 2 Sensor 3 on the vehicle in question.

Symptoms

Engine management warning light on
Usually no noticeable change in driveability
Possible slight rise in fuel consumption if fuel trim control is affected
Other oxygen sensor or catalyst monitor codes stored alongside it
Failed emissions test or monitor not ready

Possible causes

Failed heater element inside the Bank 2 Sensor 3 oxygen sensorlikely
Damaged, chafed or corroded wiring to the sensor heater circuitlikely
Corroded, loose or contaminated sensor connectorpossible
Blown fuse or faulty relay supplying the heater circuitpossible
Exhaust leak or heat damage near the sensor affecting the sensor or its harnesspossible
Fault in the control unit heater driver circuitrare

How to diagnose

Read all stored codes and freeze frame data, and note whether other heater or oxygen sensor codes are present
Identify which sensor is Bank 2 Sensor 3 on this model and engine using the wiring diagram or service information
Inspect the sensor, harness and connector for heat damage, chafing, melted insulation, water ingress and corrosion
Check the fuse and relay for the heater supply circuit
Measure the sensor heater resistance at the sensor terminals with the engine cold and compare it with the manufacturer specification
Check for battery supply and a good earth or switched control signal at the sensor connector, following the model-specific wiring diagram
Check the wiring for continuity and shorts between the sensor connector and the control unit
Clear the code and road test, then recheck whether it returns and that monitors complete

How to fix

Replace the Bank 2 Sensor 3 oxygen sensor if the heater element is open circuit or out of specification
Repair or replace damaged wiring and terminals in the heater circuit
Clean or replace a corroded or damaged connector
Replace a blown fuse only after finding and correcting the cause, or replace a faulty relay
Repair exhaust leaks or heat damage that are affecting the sensor or harness
Diagnose and repair the control unit only if all wiring and sensor checks are good, following the manufacturer's procedure

Can I keep driving?

Low severity

The car can normally be driven while you arrange a repair, as this fault rarely affects safety or causes immediate damage. Book it in soon, particularly as it may cause an MOT or emissions test failure.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.