P0158 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
P0158 is a generic OBD2 powertrain code. It means “O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)” — the same on every make and model, because the definition comes from the SAE J2012 standard rather than from the carmaker.
Ask the AI about P0158 on your car- System
- Powertrain (P)
- Code type
- Generic (SAE)
- Range
- P01xx
What the wording tells you
“High” here is electrical: the module saw the voltage in this circuit stay above its expected window. The usual causes are a short to voltage, a broken ground, an unplugged connector (many sensors read high when disconnected) — or the component itself.
Bank 2: engines with two rows of cylinders — V6, V8, boxer — have two banks. Bank 1 is the side that holds cylinder 1, bank 2 the other side; an inline engine has only bank 1.
Sensor 2: exhaust sensors are numbered along the exhaust flow. Sensor 1 is the one nearest the engine — for oxygen sensors, the one before the catalytic converter — and each higher number sits further downstream.
Can I keep driving with P0158?
The rule of thumb for this area (fuel & air metering): Usually drivable in the short term, with rougher running and worse fuel economy. Don’t leave mixture codes for weeks — a lean or rich engine damages the catalytic converter over time — and treat an injector code that comes with a misfire as urgent.
How P0158 breaks down
Powertrain. Engine, transmission, fuel and emissions — the codes behind the check engine lamp.
Generic code: defined by SAE, the same on every make.
Fuel & air metering.
The specific fault within this range.
Where to look: Fuel & air metering
The sensors the engine computer meters fuel from — mass air flow, manifold pressure, intake air and coolant temperature, throttle position, oxygen sensors and fuel pressure — the fuel trims it learns from them, and the injector, fuel-pump and turbocharger circuits.
Typical causes in this area
- Dirty or failed sensors — the mass air flow and oxygen sensors most often
- Vacuum and intake leaks
- Fuel delivery: pump, filter, pressure regulator
- Wiring and connectors
- Injector faults
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Read and clear P0158 on your iPhone
Brimly reads stored, pending and permanent codes through a Bluetooth LE or Wi-Fi OBD2 adapter, explains each one offline from the same 2,693-code dictionary as this page, and clears them once the fault is fixed — each clear goes into the car’s service history with the codes it removed. OBD diagnostics are part of Brimly Forever, a one-time purchase; the PRO assistant explains a code for your exact car.
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Frequently asked
What does P0158 mean?
P0158 is a generic OBD2 powertrain code. It means “O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)” — the same on every make and model, because the definition comes from the SAE J2012 standard rather than from the carmaker.
Can I drive with P0158?
The rule of thumb for this area (fuel & air metering): Usually drivable in the short term, with rougher running and worse fuel economy. Don’t leave mixture codes for weeks — a lean or rich engine damages the catalytic converter over time — and treat an injector code that comes with a misfire as urgent.
What causes P0158?
“High” here is electrical: the module saw the voltage in this circuit stay above its expected window. The usual causes are a short to voltage, a broken ground, an unplugged connector (many sensors read high when disconnected) — or the component itself. Typical causes in this area: Dirty or failed sensors — the mass air flow and oxygen sensors most often; Vacuum and intake leaks; Fuel delivery: pump, filter, pressure regulator; Wiring and connectors; Injector faults.
How do I clear P0158?
Fix the cause first, then clear it with any OBD2 scanner or app. Once the fault is gone the car also clears it on its own: the check engine lamp goes off after the self-test passes on three drive cycles in a row, and the stored code ages out after about 40 warm-ups. Clearing without a repair only hides it for a while — and resets the readiness monitors an emissions inspection looks at.
Is P0158 the same on every car?
Yes. P0158 is a generic SAE J2012 code, so its definition is identical on every make and model. What differs is the cause behind it and the repair procedure, which depend on the engine — that’s why the assistant on this page asks for your car.
Guides
Definitions: the generic SAE J2012 codes from Brimly’s offline dictionary (data version 2026.09). Causes and advice are general guidance for all makes — the service information for your car has the last word.