Where is the Exhaust Gas Recirculation Temperature Sensor Located?
3 Answers
Installed on the exhaust gas recirculation pipeline to measure the temperature of the recirculated exhaust gas. When the exhaust gas recirculation valve opens, the measured temperature rises, and the sensor informs the electronic control unit that the exhaust gas recirculation system is operating. Common characteristics of three types of temperature sensors: The sensor resistance uses a negative temperature coefficient thermistor, and the working principle of the sensor circuit is similar. The ECU provides a 5V power supply, with the other end of the thermistor grounded through the ECU. The ECU detects the signal voltage across the thermistor. Resistance value: As the ambient temperature increases, the resistance value decreases, and the signal voltage becomes smaller; as the ambient temperature decreases, the resistance value increases.
I've been driving for over ten years and often figure out the locations of car components myself. The Exhaust Gas Recirculation (EGR) temperature sensor can be found on the EGR system, usually installed near the exhaust pipe in the engine bay, particularly close to the EGR valve. For example, in my previous Chevrolet, it was on the side of the intake pipe, resembling a small pencil-sized probe with wires attached. When you open the hood and follow the exhaust line, you'll see various small components clustered there, and the sensor is one of them. Its position varies by car—Honda places it on the upper part of the exhaust manifold, while Ford might position it near the cooler, but most are fixed in easily accessible areas. If it malfunctions, the car may have trouble starting or trigger an emission warning light. I once experienced a sudden increase in fuel consumption, which turned out to be caused by carbon buildup on the sensor. Regularly cleaning dust around it during car washes can prevent issues. I recommend not skipping routine maintenance and paying attention to any unusual car behavior to avoid unnecessary expenses.
This sensor is crucial in automotive engine systems, monitoring exhaust gas temperature to control the recirculation rate and ensure emissions compliance. Its standard location is on the EGR pipe or EGR valve, designed to be close to the exhaust passage, typically found at the top or front of the engine bay in most vehicles. For Toyota Camry, it's commonly located below the intake port, while in Volkswagen models, it may be near the cylinder head. In daily operations, the failure rate is notable: carbon buildup or aging can cause signal deviations, triggering the check engine light and increased engine vibration. Testing is straightforward: use an onboard OBD scanner to read the temperature data stream, with normal values ranging between 200 to 500 degrees Celsius. Avoid DIY removal due to tight spaces and fragile components; professional technicians will disconnect the battery before replacement. Maintenance tip: Clean debris near the pipe every six months to prevent misdiagnosis caused by blockages.
