P0141 is reported as bank 1 sensor 2 oxygen-sensor heater circuit fault. The next step depends on the full scan and the exact vehicle, not the code alone.
If braking, steering, power, temperature, smoke, or fuel smell is abnormal, stop safely; otherwise save the full scan and arrange diagnosis.
This Subaru document supports only its stated code and vehicle context. The code alone cannot identify a failed part, prove that another make uses the same definition, or clear a car for driving. Compare your full scan with the current exact-vehicle service information.
Read the Subaru original: Bulletin 09-115-24: downstream oxygen sensor codes including P0141 Source date: 2024-05-14; research checked: 2026-11-01.
What this code means
P0141: Bank 1 Sensor 2 oxygen-sensor heater circuit fault. This is a source-scoped technical description. It does not prove that any named component has failed.
Namespace manufacturer_document_context
Make scope Source-specific manufacturer context; other vehicles need confirmation
Definition status source scoped interpretation vehicle applicability unverified
Why this exact code matters
The Subaru source covers a particular downstream oxygen-sensor heater context. A heater-circuit result is distinct from P0130's upstream oxygen-signal circuit and cannot establish a sensor revision on another VIN.
Compare P0130: upstream signal circuit. A related code is a different observation, not a second diagnosis.
Evidence to save for this code
- Exact bank and sensor position
- Heater versus signal code
Keep the complete module scan and any accompanying warning; a single emissions code cannot show every relevant fault.
Ask for a measured diagnosis
- Are supply, ground, connector, wiring, exhaust leakage or sensor response at fault?
- Is this a wideband A/F sensor requiring a different test method?
The Oxygen/A/F sensor circuit and heater diagnosis guide has the shared system checks and after-repair questions. Those broad checks apply to a system, while the meaning above is specific to P0141.
What the source does and does not establish
A Subaru bulletin lists a narrow model and year range and a sensor design change. The code alone does not prove that revision applies to your VIN.
Evidence to preserve
- Exact sensor location as identified by the vehicle manual
- All stored and pending codes and battery-voltage context
- Whether the warning returned after a prior sensor or exhaust repair
Specific questions for a shop
- Were heater power, ground, connectors and circuit behavior checked?
- If using the Subaru bulletin, were model, engine, production and sensor identification conditions matched?
Vehicle and scanner limits
We have not verified this code for every make, model, year or engine. A generic emissions scanner may not read the body, chassis, transmission or EV module that holds related faults. Compare the full scan with the owner manual and manufacturer service information.
Sources and scope
- Subaru — Bulletin 09-115-24: downstream oxygen sensor codes including P0141 Document: 2024-05-14 · Research checked: 2026-11-01
- Ford — Gasoline OBD System Operation Summary MY 2024–2025 Document: 2024-04-16 · Research checked: 2026-11-01
- Ford — OBD System Operation Summary, gasoline 2020–2023 update Document: 2023-10-23 · Research checked: 2026-11-01
- Ford — 1999 Powertrain Control/Emissions Diagnosis DTC descriptions Document: date not recorded · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.