Repair cost
$150–$450
DIY from $35
DIY difficulty
Moderate
If you do it yourself
Urgency
Within a month
Before bigger damage
Common symptoms
- Check engine light on
- No noticeable change in drivability
- Slightly worse cold-start emissions
- May fail an emissions test
Common causes, ranked by likelihood
Based on typical diagnoses for P0141. Work from the most likely cause down before replacing expensive parts.
Failed downstream O2 sensor heater 55%
Blown fuse or wiring fault in the heater circuit 25%
Corroded connector at the sensor 15%
PCM or relay fault 5%
How to diagnose it
- Check the fuse that feeds the O2 sensor heater circuit.
- Inspect the downstream (rear) O2 sensor connector for corrosion or damage.
- Measure the heater element's resistance against spec.
- Replace the oxygen sensor if the heater element has failed.
DIY vs shop cost
Shop
$150–$450
Parts + labour at an independent shop.
DIY can save up to $30
Make-specific notes
Honda
Downstream O2 sensor heater failures are common on higher-mileage Hondas; a direct-fit sensor resolves P0141.
P0141 questions, answered
Is P0141 safe to drive with?
Yes. The sensor still works once warm, so drivability is normal. It mainly affects cold-start emissions, so fix it to pass testing and clear the light.
Which sensor is Bank 1 Sensor 2?
It's the downstream oxygen sensor — the one after the catalytic converter — on the same bank as cylinder 1. That's the sensor whose heater circuit P0141 refers to.