What causes fault code P0152?

• Most likely: Faulty Oxygen (O2) sensor (internal short) • Likely: Wiring harness damage (short to voltage/B+) • Possible: Excessive fuel pressure (faulty regulator) • Rare: Leaking fuel injector on Bank 2 • Rare: Internal ECM failure

How do you fix fault code P0152?

STEP 1: Inspect the sensor connector for corrosion or oil contamination. STEP 2: Use a scan tool to monitor live O2 sensor voltage. Create a temporary vacuum leak; the voltage should drop below 0.2V. If it stays high (>0.9V), proceed to wiring tests. STEP 3: Measure voltage at the connector with sensor unplugged (KOEO). The signal wire should not show battery voltage. Check heater circuit resistance (typically 2-20 Ohms). STEP 4: Replace the O2 sensor if wiring is correct but sensor fails to respond to induced lean conditions.

Powertrain (Engine & Gearbox)Standard EOBD

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

Q: What are the symptoms of fault code P0152?

• Check engine light (MIL) illuminated • Poor fuel economy • Engine hesitation or rough idle • Black smoke from exhaust • Emissions test failure

Last updated:1 February 2026

Related:Lambda-sond (O2 Sensor), Engine Control Module (ECM/PCM), Fuel Pressure Regulator, Fuel Injectors

System

Powertrain (Engine & Gearbox)

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Technical Description

P0152 occurs when the Engine Control Module (ECM) detects that the Oxygen (O2) sensor for Bank 2, Sensor 1, is maintaining a voltage above the normal operating range (typically exceeding 0.9V to 1.2V for more than 120 seconds). Under normal closed-loop operation, the sensor should oscillate rapidly between 0.1V and 0.9V. A sustained high voltage signals an excessively rich air-fuel mixture or a circuit fault such as a short to voltage.

Possible Causes

Faulty Oxygen (O2) sensor (internal short)

Wiring harness damage (short to voltage/B+)

Excessive fuel pressure (faulty regulator)

Leaking fuel injector on Bank 2

Internal ECM failure

Symptoms

Check engine light (MIL) illuminated

Poor fuel economy

Engine hesitation or rough idle

Black smoke from exhaust

Emissions test failure

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

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

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