P0158

O2 Sensor Circuit High Voltage Bank 2 Sensor 2

Q: Is it safe to drive with P0158?

Generally yes for normal driving — it's a downstream sensor circuit fault. Fix it to keep fuel control accurate and to pass emissions.

Q: Can I just clear P0158?

It returns once the ECM sees the high voltage again. Repair the wiring or sensor, or address a rich-running cause, first.

Fuel & air metering Generic OBD-II Medium

What it means

P0158 means the downstream oxygen sensor on bank 2 (sensor 2, after the catalytic converter) is sending an abnormally high voltage. That usually indicates a wiring short to voltage or a failing sensor, though a genuinely rich-running engine can also drive the signal high. The car typically drives fine, but it affects emissions monitoring and fuel-trim accuracy.

Medium

Can I keep driving? Usually safe to drive — this is a downstream oxygen-sensor circuit fault that mainly affects emissions and fine fuel control, not starting.

Real-world scan data

Seen in

235

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0158 scans

P0138in 26.0% of scans

P0300in 25.1% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Often little or no change in drivability
Possible slightly rich running or minor fuel-economy loss
May fail an emissions test

Common causes

Most likely first

Signal wire shorted to voltage or a chafed harnessLikely
Faulty oxygen sensor (bank 2, sensor 2)Common
Corroded or loose connector at the sensorCommon
Engine genuinely running rich (check fuel trims)Less often
Faulty ECM/PCM (rare — rule out wiring and sensor first)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check fuel-trim values for a real rich condition.
Inspect the sensor signal wiring for a short to voltage or damage.
Check the connector for corrosion or looseness.
View the sensor voltage on a scan tool — stuck high points to a circuit or sensor fault.
Replace bank 2 sensor 2 if it's at fault; repair wiring as needed. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0158?+

Generally yes for normal driving — it's a downstream sensor circuit fault. Fix it to keep fuel control accurate and to pass emissions.

Can I just clear P0158?+

It returns once the ECM sees the high voltage again. Repair the wiring or sensor, or address a rich-running cause, first.

Read & clear P0158 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX