P0159 – OBD-II DTC

OBD-II DTC P0159 – O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)

DTC P0159 meaning

DTC P0159 refers to a diagnostic trouble code indicating a high voltage condition in the oxygen sensor circuit for Bank 2 Sensor 2. This sensor is typically located after the catalytic converter and is responsible for monitoring the oxygen levels in the exhaust gases. A high voltage reading suggests that the sensor is detecting an excessive amount of voltage, which can lead to incorrect air-fuel mixture adjustments by the engine control module (ECM).

DTC P0159 symptoms

Common symptoms associated with DTC P0159 may include:

• Check Engine Light illuminated
• Poor fuel economy
• Rough engine idle
• Increased emissions
• Engine performance issues, such as hesitation or stalling

DTC P0159 causes

Several factors can lead to the occurrence of DTC P0159, including:

• Faulty oxygen sensor (Bank 2 Sensor 2)
• Wiring issues, such as shorts or open circuits in the sensor circuit
• Corroded or damaged connectors
• Exhaust leaks near the sensor
• Faulty engine control module (ECM)

DTC P0159 seriousness

DTC P0159 can be considered serious as it affects the engine’s air-fuel mixture, potentially leading to:

• Increased fuel consumption
• Higher emissions, which can lead to failing emissions tests
• Long-term engine damage if not addressed

How to diagnose DTC P0159

To diagnose DTC P0159, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the oxygen sensor and its wiring for visible damage or corrosion.
3. Check the sensor’s voltage output using a multimeter.
4. Test the continuity of the wiring between the sensor and the ECM.
5. Look for exhaust leaks that may affect sensor readings.
6. Clear the code and perform a test drive to see if the code returns.

How to fix DTC P0159 step-by-step instructions

To fix DTC P0159, follow these steps:

1. Identify and repair any wiring issues or damaged connectors.
2. If the oxygen sensor is faulty, replace it with a new one.
3. Ensure that there are no exhaust leaks near the sensor.
4. Reconnect all connectors and wiring securely.
5. Clear the DTC using an OBD-II scanner.
6. Perform a test drive to verify that the code does not return.

How to erase DTC P0159

To erase DTC P0159, you can follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear Codes” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the engine to ensure the code does not reappear.