P0161

O2 Sensor Heater Circuit Bank 2 Sensor 2

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased fuel consumption
Unstable engine operation at idle
Check Engine Light Is On
Increased level of harmful emissions

Causes

Malfunction of the oxygen sensor (lambda probe)
Open or short circuit in the heater circuit
Wiring harness damage
Faulty relay or fuse
Problems with the ECU

How to Fix

Check the resistance of the sensor heater (should be within 5-20 Ohms)
Check the integrity of wiring and connectors
Check the voltage in the heater circuit (usually 12 V)
Replace the oxygen sensor if necessary
Check and replace fuse or relay if necessary

Related codes

P0135 P0141 P0155 P0167