garajizOBD-II code · generic
P0051
HO2S Heater Control Circuit Low
- System
- P0 — Powertrain (generic)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P0051 mean?
P0051 is defined as “HO2S Heater Control Circuit Low”.
You can usually keep driving, but have it checked soon so a small fault doesn’t become a bigger one.
Manufacturer-specific meanings
The same code can mean something different on some makes.
- Kia: HO2S 21 Hater Circuit Low Input
- Nissan: Heated oxygen sensor (H02S) 1 bank 2 – heater voltage low
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This page is general information; an exact diagnosis needs measurements and a technician’s check.