Code Definition: P1153 - Oxygen Sensor Heater Circuit Low Voltage (Bank 2 Sensor 2)
The P1153 code is a generic trouble code that indicates the oxygen sensor heater circuit has low voltage in bank 2 sensor 2. The oxygen sensor measures the amount of oxygen in the exhaust gases and sends a signal to the engine control module (ECM) to adjust the fuel injection accordingly. The heating element in the oxygen sensor helps to speed up the catalytic converter's operation and improve fuel efficiency.
Possible Causes:
- Faulty oxygen sensor
- Damaged or worn-out heating element in the oxygen sensor
- Bad connection between the oxygen sensor and the wiring harness
- Malfunctioning engine control module (ECM)
- Low battery voltage
Symptoms:
- Illuminated check engine light
- Poor engine performance
- Rough idling
- Decreased fuel efficiency
- Difficulty starting the engine
Diagnostic Procedure:
- Use a scan tool to retrieve the trouble code and view the freeze frame data to determine when the code was set and under what operating conditions.
- Check the oxygen sensor connector for any signs of damage or corrosion.
- Measure the resistance of the heating element in the oxygen sensor using a multimeter. Compare the reading to the manufacturer's specification.
- Perform a visual inspection of the wiring harness connecting the oxygen sensor to the ECM. Look for any signs of damage, wear, or corrosion.
- Test the voltage at the oxygen sensor connector to ensure it matches the manufacturer's specification.
- Clear the code and perform a road test to see if the condition persists. If the code does not return, the problem may have been intermittent or related to a loose connection.
- If the code returns, replace the oxygen sensor and retest. If the problem persists, consider replacing the ECM.
Repair Information:
- Replace the faulty oxygen sensor.
- Repair any damaged or worn-out components in the wiring harness.
- Replace the engine control module (ECM) if necessary.
- Ensure that the battery voltage is within the manufacturer's specified range.
