P0141
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
The engine computer found a problem with the heater in the oxygen sensor after the catalytic converter on bank 1. This heater helps the sensor warm up quickly so the engine can control emissions correctly. The car may run normally, but the problem should be fixed soon.
- SEV
- 2/5
- DRIVE
- CAUTION
- DIY
- $20–$120
- SHOP
- $120–$350
Quick answer
AI-CITATION READYWhat it means
Can you drive with it?
Most common causes
- Failed oxygen sensor heater in Bank 1 Sensor 2
- Blown fuse or shared heater circuit fuse
- Damaged wiring, connector corrosion, or loose connection at the rear O2 sensor
Typical repair cost
DIY usually runs $20–$120. Typical shop repair lands around $120–$350, depending on the root cause.
01 / Definition
P0141 is set when the powertrain control module detects an electrical fault in the heater circuit of the downstream oxygen sensor on bank 1, sensor 2. The heater element may be open, shorted, not receiving power, or not being commanded correctly. This code usually affects emissions readiness and catalyst monitoring more than drivability.
02 / Drive status
With caution. You can usually drive short term, but emissions may increase and fuel economy may be slightly worse. If the check engine light is flashing or the vehicle runs poorly, stop driving and diagnose it immediately.
03 / Symptoms
- Check engine light
- Stored P0141 code
- Emissions test failure or not ready monitor
- Slightly worse fuel economy
- Longer warm-up for oxygen sensor monitoring
- Usually no major drivability problems
04 / Causes
| 1 | Failed oxygen sensor heater in Bank 1 Sensor 2 | high |
|---|---|---|
| 2 | Blown fuse or shared heater circuit fuse | high |
| 3 | Damaged wiring, connector corrosion, or loose connection at the rear O2 sensor | high |
| 4 | Exhaust or road damage to the sensor harness | medium |
| 5 | Faulty PCM driver circuit or control issue | low |
| 6 | Incorrect aftermarket sensor or poor-quality replacement sensor | low |
05 / Diagnostic sequence
- 01Check for related codes, especially heater circuit, O2 sensor, or fuse codes.
- 02Inspect the Bank 1 Sensor 2 wiring and connector for heat damage, corrosion, broken wires, or loose pins.
- 03Check the heater fuse and verify it is not blown.
- 04Measure battery power and ground at the sensor heater circuit with key on as applicable.
- 05Test heater resistance in the sensor and compare to manufacturer specifications.
- 06If wiring and power are good, verify PCM command and continuity from the harness to the control side.
- 07Replace the sensor if the heater element is open or out of spec.
- 08Clear codes and confirm the repair with a drive cycle or scan tool data.
06 / Repairs
| 1 | Replace a blown heater fuse and inspect for the cause of the overload | $5–$20 |
|---|---|---|
| 2 | Repair damaged wiring, terminals, or connector at Bank 1 Sensor 2 | $20–$150 |
| 3 | Replace the Bank 1 Sensor 2 oxygen sensor if the heater is faulty | $50–$180 |
| 4 | Diagnose and repair PCM control fault only if power, ground, and sensor test good | $150–$600 |
07 / Related codes
08 / FAQ
Where is Bank 1 Sensor 2 located?
It is the downstream oxygen sensor on bank 1, usually located after the catalytic converter.
Can a bad oxygen sensor heater affect drivability?
Usually not much. It mainly affects emissions monitoring and readiness, but it can cause a check engine light and failed inspection.
Will clearing the code fix P0141?
No. The code will return if the heater circuit problem is still present.
09 / Source and method
- DATA BASIS
- OBD-II REFERENCE + OBD2.HELP
- METHOD
- STATIC VALIDATION
- SAFETY
- INFORMATIONAL
This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.
Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.
Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.