P0152 – O2 Sensor Circuit High Voltage (Bank 2, Sensor 1)

DTC Data Sheet
SystemPowertrain
StandardSAE J2012 / ISO 15031-6
Fault typeCircuit High
Official meaningO2 Sensor Circuit High Voltage (Bank 2, Sensor 1)

The bank 2 upstream O2 sensor signal is stuck above the expected maximum, indicating a permanently rich exhaust on bank 2 or a sensor reporting high.

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⚠ High-Voltage Safety Note: This code relates to a hybrid or EV system. The sensor and wiring circuit itself is low voltage, but it is located near high-voltage components. Always follow manufacturer HV safety procedures before working in the motor electronics area. You do not need to open HV components to diagnose this circuit, but HV isolation and PPE requirements still apply.

P0152 Quick Answer

The bank 2 upstream O2 sensor signal is stuck above the expected maximum, indicating a permanently rich exhaust on bank 2 or a sensor reporting high.

What Does P0152 Mean?

O2 Sensor Circuit High Voltage (Bank 2, Sensor 1). The bank 2 upstream O2 sensor signal is stuck above the expected maximum, indicating a permanently rich exhaust on bank 2 or a sensor reporting high.

Symptoms

  • Check engine light
  • Black smoke from exhaust
  • Rich idle, fouled spark plugs
  • Possible co-codes: P0172 / P0175

Common Causes

  • Bank 2 fuel injector leaking
  • Excessive fuel pressure
  • Contaminated O2 sensor (silicone, coolant, oil)
  • Short to power on the signal wire
  • Failed sensor stuck high

Diagnosis Steps

You’ll need a scan tool capable of reading live powertrain data, a digital multimeter, and access to the wiring diagram for the specific platform.

  1. Read fuel trims for bank 2. STFT and LTFT negative confirm a real rich condition.
  2. Verify fuel pressure under load.
  3. Inspect for leaking injector (long crank, smell of fuel after startup).
  4. Swap upstream sensors B1 and B2 — if the rich reading follows the sensor, replace it.

Possible Fixes

  • Fuel injector replacement
  • Fuel pressure regulator repair
  • O2 sensor replacement when contaminated or stuck

Can I Still Drive With P0152?

The vehicle will usually still drive with P0152 stored, but performance, drivability, or emissions will be degraded. The PCM may inhibit emissions monitors and limit closed-loop fueling adjustments. Drive to a workshop, but don’t ignore the code long-term — degraded sensor data can mask other faults and shorten catalyst life.

How Serious Is This Code?

P0152 is a moderate-priority fault. It will not prevent the engine from running but unaddressed it can damage the catalytic converter, reduce fuel economy, or cause failed emissions testing. Address within a few drive cycles.

Brand-Specific Guides for P0152

Manufacturer-specific diagnostic procedures with factory data and pin-level details for vehicles where this code commonly sets:

Compare nearby o2 voltage trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • P0158 – O2 Sensor Circuit High Voltage (Bank 2, Sensor 2)
  • P0157 – O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)
  • P0151 – O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1)
  • P0161 – O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 2)
  • P0160 – O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 2)
  • P0159 – O2 Sensor Circuit Slow Response (Bank 2, Sensor 2)

FAQ

Will P0152 clear itself?

Only if the underlying fault was intermittent and self-corrected. Most root causes are persistent and require physical repair.

Can I clear P0152 without fixing it?

You can clear it with a scan tool, but it will return as soon as the fault condition reappears — typically within one or two drive cycles.

Is P0152 related to other codes?

Often, yes. Adjacent codes in the same circuit or system frequently set together — if P0152 is present, scan for related codes and address them as a group.