Definition of Trouble Code P0144
Trouble code P0144 is associated with the oxygen sensor circuit and indicates
a high voltage issue in Bank 1 Sensor 3. The oxygen sensor monitors the level of
unburned oxygen in the exhaust gases and provides feedback to the engine control
module (ECM). This information helps the ECM to maintain optimal fuel mixture and
engine performance. When the voltage detected by the ECM in the oxygen sensor circuit
is abnormally high, it triggers the P0144 code.
Diagnosing Trouble Code P0144
To diagnose the P0144 trouble code, follow these steps:
1. Read the diagnostic trouble codes (DTCs) using an OBD-II scanner. Record any
related codes to assist in diagnosing the root cause of the problem.
2. Perform a visual inspection of the oxygen sensor wiring and connectors. Look
for any signs of damage, corrosion, or loose connections that could lead to a high
voltage reading in the circuit.
3. Using a digital multimeter, test the oxygen sensor's voltage output. A properly
functioning sensor should produce a voltage between 0.1 and 0.9 volts. If the voltage
is consistently higher than 0.9 volts, it may indicate a faulty sensor or an issue
in the oxygen sensor circuit.
4. Check the oxygen sensor heater circuit for proper operation. A malfunctioning
heater circuit can cause the sensor to produce incorrect voltage readings.
Repairing Trouble Code P0144
After diagnosing the P0144 trouble code, follow these steps to repair the issue:
1. If the visual inspection revealed any damaged wiring or connectors, repair
or replace them as necessary.
2. If the oxygen sensor voltage output is consistently higher than 0.9 volts,
replace the faulty oxygen sensor. It is essential to use the correct replacement
sensor, as using an incorrect sensor can cause additional issues.
3. If the oxygen sensor heater circuit is not functioning correctly, repair or
replace the affected components. This may include the oxygen sensor itself or related
wiring and connectors.
4. If other related DTCs were recorded during diagnosis, address them as needed.
These codes may be a symptom of the P0144 code or vice versa.
5. Once all repairs have been completed, clear the DTCs using the OBD-II scanner.
Perform a test drive to ensure that the issue has been resolved and the check engine
light does not return.
Trouble code P0144 - Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 3) is
a critical issue that can impact your vehicle's fuel efficiency and emissions. By
following the steps outlined above, you can effectively diagnose and repair the
problem. Always remember to address any related DTCs, use the correct replacement
parts, and test drive your vehicle after repairs to ensure a successful resolution
of the issue.