P0146 OBD-II: O2 Sensor Circuit no Activity Detected

P0146 Severity

Moderate

Will P0146 go away on its own?

Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.

For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.

Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.

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What causes OBD-II fault code P0146?

The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. This information is critical to the PCM's ability to maintain efficient fuel economy. When the PCM detects a failure of the sensor or the information received from the sensor, it will set code P0146.

What Does P0146 Code Mean?

Fault Code Definition

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. P0146 is set when the Rear Oxygen Sensor signal does not show enough activity to indicate fuel control and closed loop fuel management

P0146 Symptoms

Check Engine Light will illuminate
In many cases, no abnormal symptoms may be noticed
In some cases, the vehicle will fail an Emissions Test
In many cases, the NOx emissions will be elevated

Common Problems That Trigger the P0146 Code

Defective Rear Most Oxygen Sensor
Faulty Rear Most Oxygen Sensor wiring or connections

Common Misdiagnoses

Oxygen Sensor is replaced when the problem is faulty sensor wiring or connections
Rear Catalytic Converter or Rear Oxygen Sensor is replaced when the problem is an exhaust leak before the Rear Oxygen Sensor

OBD Code Resources

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What Does P0146 Code Mean?

Fault Code Definition

P0146 Symptoms

Check Engine Light will illuminate
In many cases, no abnormal symptoms may be noticed
In some cases, the vehicle will fail an Emissions Test
In many cases, the NOx emissions will be elevated

Common Problems That Trigger the P0146 Code

Defective Rear Most Oxygen Sensor
Faulty Rear Most Oxygen Sensor wiring or connections

Common Misdiagnoses

Oxygen Sensor is replaced when the problem is faulty sensor wiring or connections
Rear Catalytic Converter or Rear Oxygen Sensor is replaced when the problem is an exhaust leak before the Rear Oxygen Sensor

P0146 OBD-II: O2 Sensor Circuit no Activity Detected

Will P0146 go away on its own?

What causes OBD-II fault code P0146?

Need a P0146 diagnosis? Trust our experts.

What Does P0146 Code Mean?

Fault Code Definition

P0146 Symptoms

Common Problems That Trigger the P0146 Code

Common Misdiagnoses

OBD Code Resources

Need a P0146 diagnosis? Trust our experts.

Ask our experts about P0146.

Other OBD-II Codes

What Does P0146 Code Mean?

Fault Code Definition

P0146 Symptoms

Common Problems That Trigger the P0146 Code

Common Misdiagnoses