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Vehicle Manufacturer: Mercedes-Benz (Daimler AG)
Established: 1/1/1882
Country of Origin: Germany

Mercedes-Benz is a German manufacturer of automobiles, buses, coaches, and trucks. Mercedes-Benz is a division of its parent company, Daimler AG. Mercedes-Benz traces its origins to Karl Benz's creation of the first petrol-powered car, the Benz Patent Motorwagen, patented in January 1886 and Gottlieb Daimler and engineer Wilhelm Maybach's conversion of a stagecoach by the addition of a petrol engine later that year. The Mercedes automobile was first marketed in 1901 by Daimler Motoren Gesellschaft.

The first Mercedes-Benz brand name vehicles were produced in 1926, following the merger of Karl Benz's and Gottlieb Daimler's companies into the Daimler-Benz company. Mercedes-Benz has introduced many technological and safety innovations that later became common in other vehicles. Mercedes-Benz is one of the most well-known and established automotive brands in the world, and is also the world's oldest automotive brand still in existence today.

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Mercedes Benz Servicing

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Generic OBD Error Code Details for P0146

O2 Sensor Circuit No Activity Detected

What does this mean?

OBD Code P0146refers to
The catalytic converter is used to control emissions. The o2 sensor on Bank 1, position 3 is aft of the converter and monitors the catalyst efficiency. The PCM (Powertrain Control Module) does this by comparing the post-cat o2 sensor to the pre-cat o2 sensors. The o2 sensor is a four wire sensor. The PCM supplies a reference to the sensor of about half a volt and also supplies a sensor ground and 12 volts for the heater element. The fourth wire is a ground for the heater element (the heater in the sensor helps the sensor to warm up faster which allows the engine to reach closed loop sooner). The sensor varies the supplied reference voltage based on oxygen content of the exhaust. Oxygen sensors are capable of varying between 0.1 volts to 0.9 volts. Lean exhaust produces low voltage and causes the supplied 0.45 volts to drop. Rich exhaust produces high voltage and causes the supplied 0.45 voltage to increase. Pre-catalyst o2 sensors switch between low and high voltage rapidly. However a post-cat o2 sensor may switch much slower & not vary as much (this is normal). If the sensor doesn't respond as it should or there are too few switches in a given time period, P0146 may set.


Possible sumptoms of OBD code P0146
Symptoms of a P0146 DTC may include: MIL (Malfunction Indicator Lamp) on May idle or drive poorly Fuel economy may decrease


Possible causes of OBD code P0146
Potential causes of an P0146 code include: Bad Bank 1, position 3, o2 sensor Wiring problem, melted harness, broken connectors, etc. Bad PCM

Possible Solutions

1. Start the engine and allow it to reach operating temperature. Using a scan tool, observe the Bank 1 position 3 o2 sensor. If it isn't moving between 0.1 and 0.9 volts, increase the engine RPM to a fast idle and then recheck the sensor voltage reading. If it starts switching now, the sensor may be sluggish and/or intermittently going "dormant". Replacing the sensor at this point would be a good idea. Visually check the o2 sensor for contaminates, etc. If you suspect it's contaminated with coolant or oil, replace it. a. But, if it still isn't responding after increasing engine RPM, turn off the engine and unplug the 1/3 o2 sensor. With KOEO (key on engine off) check that there is battery voltage and ground to the o2 sensor heater element. If the heater element has no battery voltage it can cause the o2 sensor to go "dormant" and not switch properly which can cause a P0146. So, diagnose that problem first(there will usually be other codes present). b. If there is power and ground to the heater element check that the sensor ground is present. If it is, connect a jumper wire between the sensor ground and signal wire. Now the 1/3 o2 sensor reading should be low. If so, replace the Bank 1 position 3 o2 sensor. c. If, after connecting the jumper wire, the o2 sensor reading still remains "stuck", check for wiring problems, harness contacting exhaust components, or broken connectors. Repair as necessary. Then recheck. d. If you can find no wiring problems and the o2 sensor reading on the scan tool doesn't change after installing the jumper wire, recheck at the PCM connector. If it still shows no change, the PCM may be at fault.

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