P0141
Low SeverityO2 Sensor Heater Circuit (Bank 1, Sensor 2)
Emissions System
What Does P0141 Mean?
The heater in the downstream O2 sensor on bank 1 has failed.
Common Fix
Replace downstream O2 sensor
Estimated Cost (DIY)
$25 - $80
Symptoms
- ⚠️Check engine light
- ⚠️Failed emissions test
Common Causes
Burned-out heater elementlikely
Blown heater fusepossible
Corroded connectorpossible
How to Diagnose P0141
- 1Check O2 heater fuse
- 2Measure heater resistance
- 3Inspect connector
- 4Replace sensor if heater is open
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Frequently Asked Questions
- Can I just replace the heater?
- No — the heater is integrated into the O2 sensor. You must replace the entire sensor.
- Do I need to replace upstream and downstream together?
- No, replace only the failed sensor. They are independent.