A failed heater inside the oxygen sensor. A blown heater fuse. Damaged wiring or a corroded connector.

P0050 HO2S Heater Control Circuit (Bank 2 Sensor 1)

Q: What does P0050 mean?

P0050 means there's a fault in the heater circuit of bank 2's front oxygen sensor, usually a burned-out heater or a blown fuse. The engine computer found a fault in the heater circuit of the front oxygen sensor on bank 2 (the side of a V-engine without cylinder 1).

Oxygen sensors

P0050 means there's a fault in the heater circuit of bank 2's front oxygen sensor, usually a burned-out heater or a blown fuse.

The engine computer found a fault in the heater circuit of the front oxygen sensor on bank 2 (the side of a V-engine without cylinder 1).

Can I keep driving? Yes, for now.

Safe to drive. Fuel control on bank 2 may be a little off after cold starts.

Common causes

A failed heater inside the oxygen sensor
A blown heater fuse
Damaged wiring or a corroded connector

Symptoms

Check-engine light
Slightly worse fuel economy

What to check first

Check the heater fuse.
Inspect wiring for melted or chafed spots.
Measure the heater resistance at the sensor.
Check for power at the heater feed with the key on.

What does P0050 mean on your vehicle?

The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.

Ask iRepair about P0050

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Related codes

General guidance for P0050 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.