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 MANUALSLEXUS2009ES 350 V6-3.5L (2GR-FE)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCLIMATE CONTROL EXHAUST GAS SENSORTESTING AND INSPECTION
2009 Lexus ES 350 V6-3.5L (2GR-FE)
Climate Control Exhaust Gas Sensor: Testing and Inspection
2009 Lexus ES 350 V6-3.5L (2GR-FE)SECTION Testing and Inspection
AIR CONDITIONING: SMOG VENTILATION SENSOR: INSPECTION
INSPECTION
1. INSPECT SMOG VENTILATION SENSOR
(a) HC, CO
(1) Apply battery voltage between terminals 3 (IG) and 6 (E).
(2) Allow exhaust gas (HC, CO) to travel to the sensing portion of the smog ventilation sensor, and measure the resistance between terminals 1 (SG) and 2 (DGS).
OK:
When the sensor is exposed to the exhaust gas, the resistance increases.
HINT: The resistance before blowing exhaust gas is 10 kOhms to 40 kOhms.
If the resistance is not as specified, replace the smog ventilation sensor.
(b) NOx
(1) Apply battery voltage between terminals 3 (IG) and 6 (E).
(2) Allow exhaust gas (NOx) to travel to the sensing portion of the smog ventilation sensor, and measure the resistance between terminals 1 (SG) and 4 (DGS1).
OK:
When the sensor is exposed to the exhaust gas, the resistance increases.
HINT: The resistance before blowing exhaust gas is 10 kOhms to 40 kOhms.
If the resistance is not as specified, replace the smog ventilation sensor.
RENDER: 1.0x
NO RELATED
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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.