P0163 OBD Error Code: Problem & Solutions

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When a P0163 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 three 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 P0163 with your vehicle.

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 or there’s a lean condition in the exhaust (too much oxygen), it will set code P0163.

What causes the problem of O2 Sensor Circuit Low Voltage (B2 S3)?

• 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. 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.
3. Powertrain Control Module - Powertrain issues can also be the reason for this OBD error. Find all the Powertrain related parts with us.
4. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.
5. Exhaust Gas Temperature Sensor - This sensor, if faulty will wrongly measure the temperature of the air coming out of the combustion chamber and won’t be able to help in managing the air to fuel ratios. Thus, replace immediately, if found faulty.
6. Fuel Pump - An affected fuel pump will hamper the fuel delivery system and thus the engine performance. Replace damaged pumps immediately and always check for leaks.
7. Manifold Absolute Pressure Sensor - MAP sensor if faulty will affect the internal combustion engine’s electronic control system. Thus, replace faulty MAP sensor now!
8. Mass Air Flow Sensor - The MAF sensor helps in calculating the correct air to fuel ratios to support the engine combustion process. Thus, replace faulty sensor now!

Some of the most common symptoms that indicate the P0163 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

• Oxygen Sensor Replacement
• MAP Sensor Replacement
• MAF Sensor Replacement
• Fuel Pump Replacement

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P0163 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 another related controller).

Common Mistakes When Diagnosing OBD Code P0163

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.