Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1998LEGACY BRIGHTON WAGON AWD F4-2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONEGR TEMPERATURE SENSORDESCRIPTION AND OPERATION
1998 Subaru Legacy Brighton Wagon AWD F4-2.2L SOHC
EGR Temperature Sensor: Description and Operation
1998 Subaru Legacy Brighton Wagon AWD F4-2.2L SOHCSECTION Description and Operation
PURPOSE/OPERATION
The EGR temperature sensor (CA only) senses exhaust gas being recirculated into the engine. The sensor is used for diagnosis of the EGR system. Whenever the ignition is ON, the sensor signal is available. When the EGR valve is open, and exhaust is flowing into the engine, the sensor reads high temperature. When the EGR is closed, it reads low temperature. Because the ECU triggers the EGR through a solenoid, it is able to determine if the EGR is responding to it's control.
The EGR temperature sensor (CA only) senses exhaust gas being recirculated into the engine. The sensor is used for diagnosis of the EGR system. Whenever the ignition is ON, the sensor signal is available. When the EGR valve is open, and exhaust is flowing into the engine, the sensor reads high temperature. When the EGR is closed, it reads low temperature. Because the ECU triggers the EGR through a solenoid, it is able to determine if the EGR is responding to it's control.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.