P0144 Code - O2 Sensor Circuit High Voltage Bank 1 Sensor 3

What Does P0144 Mean?

The Rear Catalyst Monitoring Oxygen Sensor evaluates the rear most Catalytic Converter's emissions-reducing capability in a system with two Catalytic Converters for each bank of cylinders. Code P0144 is set when the Rear Oxygen Sensor voltage signal to the Powertrain Control Module (PCM) remains too high for an extended period of time.

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What are the common causes of P0144 ?

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.

What are the symptoms of P0144 ?

Symptoms of a P0144 diagnostic trouble code may include:

• Cherry red hot catalytic converter
• Poor acceleration
• The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
• Reduction in engine performance, especially at low RPM levels

How do you troubleshoot P0144 ?

Circuit “High” and circuit “Low” DTCs are set when the ECM detects sensor voltage outside of what the sensor is physically capable of sending. For example, a certain HO2S may only signal between 0.1 V and 0.9 V, higher voltage signaling lower O2 content, and vice-versa. If the ECM detects lower than 0.1 V or higher than 0.9 V, which the sensor cannot do, this means that there is a problem in the circuit or in the sensor itself. Depending on the vehicle, this voltage threshold may be different, so check your repair manual to be sure. You’ll need a DMM (digital multimeter) to diagnose the HO2S circuit.



General Checks – First, check fuses and harnesses for any obvious problems, such as blown fuses and chafed or pinched wires. Check the oxygen sensors for damage. Check the connectors for bent or broken pins or corrosion and that they are properly seated. Repair as necessary.
Exhaust Check – As a matter of course, use an open mechanic’s stethoscope to check for exhaust leaks, particularly between the TWC and HO2S. Repair as necessary.
Circuit Checks – Disconnect the ECM and HO2S. Check for continuity on the two lines. You should have less than 1 Ω resistance end to end and more than 10 kΩ between them and to ground.
If you find excessive resistance or a short circuit, repair as necessary.
If resistance is proper, replace the sensor.
Sensor – Generally, most people simply jump to replacing the sensor, though you shouldn’t condemn the sensor unless you can rule out circuit problems.
Check the HO2S for internal resistance. From the heater positive to both sides of the sensor circuit should measure over 10 kΩ. Replace if otherwise.
If you can view live data from the HO2S and AFR sensor, compare the two signals. If the HO2S is stuck low or high, you can safely assume a faulty sensor. If you have active testing, even better, as you can attempt to force an HO2S reaction. If you get no response, suspect a sensor or circuit fault.



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