P0057 - OBD Trouble Code

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When a P0057 trouble code sets it means that the powertrain control module has detected a fault, specifically low voltage, on the heater control circuit for the bank two sensor two oxygen sensor.

If you notice a lean or risk condition in the engine, decreased fuel efficiency, black smoke from the taillight, and/or illuminated Check Engine Light on the dashboard, them there is a major possibility that you are dealing with the OBD Code P0057 with your vehicle.

OBD-II Code P0057 is defined as a HO2S Heater Control Circuit Low

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) should reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the sensor reaches that temperature the faster it starts 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 purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. The oxygen sensor must be at a certain temperature in order for this information to be accurate. The oxygen sensor has a heater wire inside to help bring the sensor up to temperature quicker. When the PCM detects the heater wire is not operating, it will set code P0057.

What causes this problem with the Heater Control Circuit Low?

• Heated Oxygen Sensor wiring/harness is open or short
• Problem with electrical connections to the Oxygen Sensor
• Faulty or damaged Heated Oxygen Sensor
• Blown circuit fuse of the sensor
• ECM/PCM fault or failure to detect and interpret data
• Leakages in the fuel delivery systems and exhaust systems

1. Heated Oxygen Sensor - A faulty sensor will not be able to perform properly and not analyse the air to fuel ratio in the exhaust. Visit us today to replace damaged oxygen sensors.
2. Heated Oxygen Sensor Harness - OBD Error Code P0057 may also occur if the sensor harness is damaged. Replace damaged sensor harness now!
3. Heated Oxygen Sensor Connector - A faulty Oxygen Sensor Connector can cause immediate performance issues. Replace your old connectors now!
4. Engine Control Module - Faulty EVMs may lead to engine stalling or not starting, and check engine lights being on. It’s better to get the faulty electricals replaced as soon as possible.
5. Powertrain Control Module - Powertrain issues can also be the reason for this OBD error. Find all the Powertrain related parts with us.
6. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.

Some of the most common symptoms that indicate the P0057 error code are listed below;

Common Symptoms

• Check Engine Light flashing in the display monitor
• ECM indicating the stored error code
• Exponential increase in the fuel consumption pattern
• Rough engine with occasional stalling
• Lack of power and acceleration due to failure of fuel delivery system
• Black or white smoke coming from the tailpipe

Verify the code with a scanner, reset the fault codes, and perform a road test from a certified technician. If the P0057 code returns, then follow the test procedure. Follow the following steps to correct the OBD error code;

• Reset the code and test the vehicle again to see if the Engine Warning Light comes back on, and the code returns after the engine is at operating temperature using the OBD scanner. If it comes back, then check the resistance on the wiring of HO2S to ensure that it is about 8 ohms.
• Also check the wiring and connector to the sensor to ensure that the wires are not broken, frayed, damaged or melted to the exhaust system. Repair wiring and connectors with correct parts and wiring type to ensure original operation.
• The heating oxygen sensor and wiring are especially susceptible to damage as they are close to the body; it is imperative that the wiring be secured away from the exhaust as much as possible.

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P0057 can be a simple code to diagnose when all diagnostic steps are followed in the proper order and all tests are performed. A professional level scan tool that shows live sensor data will be required to properly diagnose any faults present.

• A suitable OBD-II scanner (or code reader) and a digital volt/ohmmeter will be most helpful in performing a successful diagnosis.
• Begin with a visual inspection of all wiring and connectors and repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary.
• Always retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components (Including fuses) appear to be in normal working order, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data.
• Continue by clearing the code and operating the vehicle to see if it returns. This will help to determine whether or not the malfunction is intermittent.
• Test drive the vehicle afterwards to ensure that a successful repair was performed. If the oxygen sensor conforms to the manufacturer’s specifications, prepare to test system circuits for resistance and continuity by disconnecting the electrical connector/s from all related control modules (especially the PCM)
• Compare your actual findings with manufacturer’s specifications and repair or replace circuits, components, or connectors as required
• Once the repairs are made, clear the codes and test drive the vehicle to ensure that the repair was successful. If oxygen sensor and system circuits are comparable to the manufacturer’s specs, suspect a defective PCM (or other related controller).

Common Mistakes When Diagnosing OBD Code P0057

Any quality mechanic will own a scan tool capable of reading live sensor data. When the heater circuit is found to have failed for the oxygen sensor, the sensor must be replaced. The heater is internal to the sensor and is replaced as a single unit. Thus, proper checks are mandatory to avoid unnecessary problems in the future and spending unnecessary money on repairs.