![]() 2x Pre-cat O2 Oxygen Sensors For Toyota Landcruiser 100 Series. Let me know if you have any further questions via reply of PM. In some models, there are sensors placed in front and at the back of the catalytic converter. When the fuel trims are out of range, there is a fuel mixture problem or a faulty oxygen sensor and this should be corrected before calling the catalytic converter faulty. Fuel trims should be in single digit ranges and the short fuel trim should be increasing and decreasing 2 or 3 percent. Monitor the fuel trims both at idle and while driving at steady speeds. The rear oxygen sensor should read about 0.6 to 0.7 volts when the catalytic converter is efficient.Ģ. When the rear sensor switches above and below 0.45 volts, the catalytic converter may be faulty. Monitor the front and rear oxygen sensors while driving the vehicle at approximately 55 MPH. I figured I'd share the testing procedures to determine whether you are dealing with a faulty oxygen sensor or catalyst.ġ. ![]() Could this be a bad sensor based upon these gfi readings or do I need a new toyota catalytic converter. I'm Getting a P0420 and the O2S11 reading is constant in the high 600 gfi range and the O2S12 has a lot of movement the rough a range of numbers. As I understand it the pre cat is the O2 sensor and the post is just an air content reader. So I have a question that I couldn't find an answer to and I was wondering if the reading for the O2S11 V is for the pre cat or post cat sensor. I really been thinking about these two components (Catalytic Converter & Oxygen Sensor) and with my gas mileage. ![]() Hey, I'm somewhat new to the forums but really appreciate all of the postings on here. ![]()
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