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.
Oxygen Sensor After Three Way Catalytic Converter -G130- CHECKING
Function
The Oxygen Sensor After Three Way Catalytic Converter -G130- downstream of the primary catalytic converter supplies the Engine Control Module -J623- with a voltage signal (nonlinear) indicating "rich" or "lean. If the primary catalytic converter is supersaturated with oxygen (lean mixture), Oxygen Sensor After Three Way Catalytic Converter -G130- will send the Engine Control Module -J623- a nonlinear signal indicating the lean mixture condition. The mixture is then enriched with fuel until the oxygen has been "displaced" from the catalytic converter. This condition, in turn, is registered by Oxygen Sensor After Three Way Catalytic Converter -G130- as a nonlinear signal indicating the rich mixture condition. The mixture is then leaned out by the Engine Control Module -J623-. If the nonlinear signal is received again, the mixture will again be enriched. The frequency, or period, during which the mixture is enriched or leaned out is variable, being dependent on the gas flow rate (engine load) at that moment.
The Oxygen Sensor After Three Way Catalytic Converter -G130- contains the following components:
- The Heater For Oxygen Sensor 1 After Catalytic Converter -Z29-
The Oxygen Sensor After Three Way Catalytic Converter -G130- components cannot be serviced separately, it must be serviced as a unit.
Special tools and workshop equipment required
- Multimeter
- Wiring Diagram
- Scan Tool
Test requirements
- Fuses OK.
- Battery voltage OK.
- Switch OFF all electrical and electronic accessories.
- Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
- Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
- Coolant Temperature: ≥ 80° C.
- Observe all safety precautions: SAFETY PRECAUTIONS .
- View clean working conditions: CLEAN WORKING CONDITIONS .
Test Procedure
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NO RELATED
Use the Manual With the Right Hardware
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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.