Engine-Codes - Mercedes-Benz - P0057 Mercedes-Benz

P0057 Mercedes-Benz Code - HO2S Heater Control Circuit Low Bank 2 Sensor 2

- Code Popularity: 3,926 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0057 Mercedes-Benz?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2
  • Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit open shorted to ground
  • Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

Code Tech Notes

Mercedes Benz Code = 0430 (Left O2 sensor, after TWC): Short circuit to ground (P0057)

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How to Fix the DTC P0057 Mercedes-Benz?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0057 Mercedes-Benz code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P0057 Mercedes-Benz Code Mean?

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the required temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
This fault code is stored in the engine control module when the control circuit for the exhaust gas oxygen sensor heater circuit does not perform as expected. The engine control module can calculate the current flow through the heater circuit to monitor the circuit condition.

P0057 Mercedes-Benz Code - HO2S Heater Control Circuit Low Bank 2 Sensor 2

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