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Home / DTC / P0158 — O2 Sensor Circuit High Voltage Bank 2 Sensor 2

P0158 — O2 Sensor Circuit High Voltage Bank 2 Sensor 2

Detailed page for trouble code P0158.

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P0158

Generic P — Powertrain

O2 Sensor Circuit High Voltage Bank 2 Sensor 2

Brand: Generic
Type: P — Powertrain
Views: UK: 22 EN: 30 RU: 33
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Page language: EN

Causes

  • Faulty Bank 2 Sensor 2 (downstream O2 sensor)
  • Short or damage in the sensor signal wiring (short to battery/12V)
  • Poor or missing ground/connector corrosion at sensor
  • Contaminated sensor (fuel, oil, coolant deposits)
  • Faulty ECM or internal driver circuit (less common)
  • Excessive fuel/air mixture (rich running) causing high O2 signal downstream

Symptoms

  • Check Engine Light illuminated (MIL)
  • Possible failed emissions test
  • Little or no drivability symptoms in many cases (downstream sensor usually not used for immediate fuel control)
  • Poor fuel economy or signs of rich running if underlying fuel issue exists

What to check

  • Retrieve freeze frame data and live PID data with an OBD-II scanner
  • Compare upstream (Bank 2 Sensor 1) and downstream (Bank 2 Sensor 2) O2 voltages
  • Inspect sensor connector and wiring for corrosion, damage, or pin short to battery
  • Measure sensor signal voltage at connector with backprobe or scope while engine running
  • Check heater circuit resistance and power/ground (if equipped)
  • Scan fuel trim, fuel pressure, and MAF/airflow readings to detect rich conditions

Signal parameters

  • Typical zirconia O2 sensor output: ~0.0–1.0 V
  • High-voltage condition threshold often >0.8–0.9 V (manufacturer-dependent)
  • Downstream sensors normally more stable than upstream; sustained high voltage indicates problem
  • Heater circuit resistance varies by sensor; consult OEM spec (commonly a few ohms to tens of ohms)

Diagnostic algorithm

  1. Read and record freeze frame and live data; note when the code set and engine conditions
  2. Visually inspect Bank 2 Sensor 2 connector and wiring for damage, corrosion, or exposure to heat; repair as needed
  3. With a known-good ground, backprobe the signal wire and measure voltage at idle and during load. Confirm voltage is abnormally high and steady.
  4. Compare to Bank 2 Sensor 1 (upstream) behavior. If upstream is switching normally and downstream is stuck high, focus on sensor/circuit/catalyst downstream.
  5. Check for short to 12V on the signal wire: disconnect sensor and measure wiring harness voltage — harness should not be held to 12V when sensor disconnected.
  6. Test heater circuit (if equipped): measure resistance, check for battery voltage to heater with key on, and check ground.
  7. Check fuel system for signs of rich condition: fuel pressure test, inspect injectors for leakage, review fuel trims, and test MAF/air metering.
  8. If wiring and fuel system OK, replace Bank 2 Sensor 2 with OEM or OE-equivalent sensor and retest.
  9. If replacement sensor does not clear code and wiring/grounds are verified, consider catalytic converter condition and ECM diagnosis (use oscilloscope or professional bench tests).
  10. Clear codes and perform road test to confirm repair and that code does not return.

Likely causes

  • Damaged/shorted signal wire or corroded connector at Bank 2 Sensor 2
  • Failed or contaminated downstream O2 sensor
  • Rich fuel condition (fuel pressure, leaking injector, MAF fault) affecting downstream readings
  • Exhaust leak or failed catalytic converter altering sensor behavior
  • Heater circuit problems less likely to cause high signal but check if related

Fault status

⚠️ Status
ECM detected a sustained high voltage signal from the Bank 2 downstream oxygen sensor (Sensor 2) for a minimum required time/conditions, indicating a circuit fault or excessive oxygen sensor voltage.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
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