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Will a bad egr temp sensor cause car to overheat?

No, a bad EGR temperature sensor will not cause a car to overheat. The EGR temperature sensor is used to monitor the temperature of the exhaust gas recirculation (EGR) system. The EGR system is designed to reduce the emissions of nitrogen oxides (NOx) from a diesel engine. The EGR temperature sensor is used to ensure that the EGR system is operating properly. If the EGR temperature sensor is bad, the engine may not be able to maintain the correct temperature for the EGR system to operate properly. This could cause the engine to run rich or lean, which could lead to decreased performance and increased emissions. However, a bad EGR temperature sensor will not cause the car to overheat.