P247B Exhaust Gas Temperature Out of Range Bank 1 Sensor 4
OBD-II Trouble Code Technical Description
Exhaust Gas Temperature Out of Range Bank 1 Sensor 4
What does that mean?
This is a generic diagnostic trouble code (DTC) and applies to many OBD-II vehicles (1996-newer). That may include but is not limited to vehicles from Ford, VW Volkswagen, Audi, Porsche, Chevy, Nissan, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration.
OBD-II trouble code P247B is associated with the exhaust gas temperature out of range bank 1 sensor 4 circuit. When the Engine Control Unit (ECU) detects improper signals within the exhaust gas temperature circuit code P247B will be set and the check engine light will be illuminated. Refer to a vehicle specific resource to determine which is the appropriate bank and sensor location for your particular year / make / model / engine combination.
The purpose of the exhaust gas temperature sensor is to monitor the temperature of the exhaust gases and convert it into a voltage signal that is sent to the ECU. The ECU utilizes the input to control engine conditions and effectively reduce emissions. The ECU recognizes these voltage variations and reacts accordingly, adjusting ignition timing or the air/fuel mixture to lower the exhaust gas temperature and protect the catalytic converter. Exhaust gas temperature sensors are incorporated in diesel engines, gasoline burning engines, and even turbocharged engines. This process also improves performance and fuel economy.
A typical EGT exhaust gas temperature sensor:
What is the severity of this DTC?
The severity of this code can vary tremendously from just an illuminated check engine light on a vehicle that starts and runs to an automobile that will stall or not start at all.
What are some of the symptoms of the code?
Symptoms of a P247B trouble code may include:
Engine may stall Engine may not start Engine may overheat Poor fuel economy Poor performance Check engine light illuminatedWhat are some of the common causes of the code?
Causes for this P247B code may include:
Defective exhaust gas temperature sensor Excessive exhaust leak Blown fuse or fuse-able link (if applicable) Excessive carbon buildup on sensor Corroded or damaged connector Faulty or damaged wiring Faulty ECUWhat are some P247B troubleshooting steps?
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB's) for the specific vehicle by year, model and power plant. In some circumstances this can save a lot of time in the long run by pointing you in the right direction.
The second step is to locate all of the components within this circuit and perform a thorough visual inspection to check the associated wiring for obvious defects such as scraping, rubbing, bare wires, or burn spots. Next is to check the connectors for security, corrosion and damaged pins. The exhaust gas temperature sensor is typically a 2-wire sensor located in the exhaust down pipe. The exhaust gas temperature sensor should be removed to inspected for excessive carbon buildup. This process must also incorporate identifying any possible exhaust leaks.
Advanced Steps
The advanced steps become very vehicle specific and require the appropriate advanced equipment to perform accurately. These procedures require a digital multi meter and the specific technical references for the vehicle. The ideal tools to use in this situation is an infrared thermometer and a heat gun, if available. Voltage requirements will vary based on the specific year and model of the vehicle.
Voltage Checks
The voltage output of the exhaust gas temperature sensor should vary proportional to temperature changes. If the voltage stays the same or changes rapidly, t
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