What to know about the EGR Temperature Sensor:
Vehicle manufacturers have been required for decades to lower the level of car emissions. One of the oldest methods of pollution control was the exhaust gas recirculation system, which is still in use by nearly all vehicles today. The exhaust gas recirculation (EGR) system re-introduces partially burned exhaust gases into the intake manifold along with the air/fuel mixture to complete its burn before being expelled out the tailpipe and into the atmosphere.
The EGR valve opens and closes to control the amount of exhaust to enable into the intake. The EGR temperature sensor is fixed in the EGR tube and measures the temperature of the exhaust gases going into the EGR valve. The engine control module gets the information from the EGR temperature sensor, determines the correct amount of flow through the EGR valve, and alters the valve accordingly. If the EGR temperature sensor isn’t reading correctly, the EGR valve will not be open in the right position. It can cause engine knock, which will result in internal engine damage. The Check Engine light can come on with EGR system-related codes and the emissions from the tailpipe will exceed the maximum standards set by your state’s smog/emissions test.
Facts to Note:
If the EGR temperature sensor is being changed, check for proper operation of the EGR valve as well.
The EGR temperature sensor is extremely hot while the engine is on. Allow the engine to cool before trying to examine or service the temperature sensor.
How to Fix:
The EGR temperature sensor is confirmed that it needs to be changed. The engine top trim cover is detached.
The faulty EGR temperature sensor is detached by disconnecting the electrical connection and removing the sensor from the EGR base or tube.
The new EGR temperature sensor is fixed into the EGR tube and the electrical connection is reconnected.
The engine is started and the EGR temperature sensor is tested for operation. The engine trim cover is reinstalled.
The vehicle is road tested to ensure proper operation of the EGR temperature sensor.
The EGR temperature sensor should last the lifetime of your vehicle. It would be advisable to have the EGR system scanned when a smog test is performed, especially if the test fails. If the EGR temperature sensor is reading incorrectly, one of our expert technicians will need to replace it.
Common symptoms indicating you may need to change the EGR Temperature Sensor:
Audible engine knock
Check Engine light is on
Failed emissions or smog test
Importance of this service:
If left unattended to, the engine knock caused by a defective EGR temperature sensor will create internal engine damage which can only be mended via expensive repairs. You will likely fail a smog test with a faulty EGR temperature sensor. If the EGR temperature sensor fails, have it changed quickly.