P0050: HO2S Heater Control Circuit Bank 2 Sensor 1
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Yes - bank 2 fueling runs coarse until the sensor warms up on exhaust heat.
Symptoms
- Check engine light
- Slightly rough running for the first minutes on cold days
- Small economy loss
Likely causes, most common first
- Bank 2 upstream heater failed
- Blown fuse
- Wiring fault on the bank 2 side
- Relay fault where fitted
Read P0050 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0050 is the bank 2 twin of P0030, so it belongs to V6, V8 and flat engines only. Everything said about the bank 1 heater applies; what changes is geography - bank 2 sensors and their wiring often route differently, sometimes down the back of the engine where inspection is harder.
The two upstream heaters usually share age, part number and often a fuse. If one heater has genuinely died of old age, budgeting for its twin within the year is realistic rather than pessimistic - and on some V engines the labor to reach the bank 2 sensor dominates the bill, which argues for doing both while everything is apart.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Frequently asked questions
Can I drive with P0050?
Yes - bank 2 fueling runs coarse until the sensor warms up on exhaust heat.
How much does it cost to fix P0050?
Typical US repair costs range from $20 for the simplest fix (fuse or relay) to $450 in the worst case. The right number depends on which cause your car has - see the causes list.
Related codes
The codes closest to P0050. They often appear together, and telling them apart is usually what narrows the diagnosis.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.