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P0144 is a diagnostic trouble code (DTC) for "O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
P0144 is the OBD-II generic code which indicates that the Engine Control Module (ECM) has detected excessively high voltage from the bank 1 sensor 3 O2 sensor circuit, indicating a rich condition.
The O2 sensor bank 1 sensor 3 is the sensor after the last catalyst. A rich condition may be a problem with the catalyst not cleaning the exhaust. This can be caused by a broken up catalyst.
The ECM detects a short to power in the circuit for the O2 from a wiring or sensor problem.
The code will cause the ECM to turn on the check engine light.
The ECM does not use this sensor for fuel control but for a catalyst monitor only and should not cause a direct impact on the engine performance.
Checks the electrical connections or wire harness cover to the O2 bank 1 sensor 3 for shorts or sensor damage
Scans codes and documents freeze frame data, then clears codes to verify the sensor failure
Monitors O2 sensor data to see if the voltage is stuck above 500 mV
Checks the exhaust catalyst for damage or if it broke apart in the housing
Follows the manufacturer's specific pinpoint tests for further diagnosis
Follow these simple guidelines to prevent mistakes:
Check the catalyst integrity for any damage before replacing the O2 sensor
Check the O2 sensor for oil or coolant contaminants that may short the sensor from engine leaks
Scan the replacement O2 sensor to make sure the heater circuit works properly
Check the removed O2 sensor for damage from a defective catalyst that will cause sensor failure
Clearing the fault codes and performing a road test to try and verify failure
Replacing the shorted O2 sensor for bank 1 sensor 3
Repairing or replacing the shorted wiring or connection to the O2 sensor for bank 1 sensor 3
The O2 sensor signal circuit for bank 1 sensor 3 is used to monitor the catalyst efficiency and does not affect the fuel control of the engine.
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