P0141: O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
Updated November 12, 2026
Oxygen sensors have a built-in heater so they work soon after a cold start. P0141 means the heater in the downstream sensor on bank 1 (after the catalytic converter) isn't working as expected.
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🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?
Common causes
- A failed heater inside the downstream O2 sensor
- A blown fuse for the O2 heater circuit
- Damaged wiring, often near the hot exhaust
- A corroded connector
Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.
Symptoms
- Check engine light
- Usually no driveability symptoms
- A failed emissions readiness check
Is it safe to drive?
Generally safe to drive; it mainly affects emissions monitoring.
How to check it with a scanner
- Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
- Check the O2 heater fuse.
- Measure the heater's resistance at the sensor connector and compare with your vehicle's spec.
- Inspect the wiring near the exhaust for melted insulation.
- After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.
A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.
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Questions
What does P0141 mean?
P0141 is the generic OBD2 code for "O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)." Oxygen sensors have a built-in heater so they work soon after a cold start. P0141 means the heater in the downstream sensor on bank 1 (after the catalytic converter) isn't working as expected.
Is it safe to drive with P0141?
Generally safe to drive; it mainly affects emissions monitoring.
How do I check P0141 myself?
Read the code and freeze-frame data with an OBD2 scanner, then: Check the O2 heater fuse. Measure the heater's resistance at the sensor connector and compare with your vehicle's spec. Inspect the wiring near the exhaust for melted insulation.
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