Rear 02 Sensor Readings

Rear 02 Sensor Readings. If a sensor stays lean or rich for a long period of time, lean or rich codes may set. The rear oxygen sensor installed after the catalytic converter is called 'downstream' or sensor 2.

toyota 02 sensor displays constant 3.3 volts, not a from mechanics.stackexchange.com

An o2 sensor will cycle between 0.10 to 0.90 or almost 1 volt. Try richening your injector compensation and see if you can get the o2 sensor to move. If the vehicle is warm and the 02 sensor reading does not change, then there is a problem with the 02 sensor and you can stop the test.

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This is slowly accelerating from a redlight to highway speeds, and setting cruise. Ok, so i did some logging with the torque app.

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As a result, the faulty sensor can cause, a too rich or too lean condition. The 3.3 volts is a pcm generated representative voltage.

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The computer compares the readings from, the (o2) sensor (pre cats) and the monitors (post cat); Rear cylinder afr reading bad.

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This sensor reads at a wider range and is a wide band sensor. An o2 sensor also has to reach the 0.1x volts amplitude mark while at full operation.

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With engine running in closed loop the voltage should read over 800mv and lower then 200mv and constantly fluctuate. In either case, the sensor may be at fault.

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Using a digi high impedance voltmeter you connect the red lead to o2 sensor signal wire. If the front and rear afr readings now are good, a harness, wiring or connector issue exists.

If The Vehicle Is Warm And The 02 Sensor Reading Does Not Change, Then There Is A Problem With The 02 Sensor And You Can Stop The Test.

The fact that fuel trims haven't updated just means the ecu hasn't gone into closed loop yet.which makes sense given the lack of an o2 reading. It is not the actual output reading. What is happening on mine is the following.

This Means The Sensor Can Read Wide Ranges Of Mixtures And Relay That Information To The Ecu.

The readings for the front the sensor 1, sensors look normal. This sensor reads at a wider range and is a wide band sensor. Post cat o2 behind the cat should read be fairly constant, if the catalytic converter working properly.

So, An Oxygen Sensor Failure, Can Lead To Incorrect Readings Of Exhaust Gasses.

We can always save on a bit of fuel. Using a digi high impedance voltmeter you connect the red lead to o2 sensor signal wire. If the rear afr reading is “now” in error, the front o2 sensor is faulty.

The Pcm Compares The Readings Of The Upstream And Downstream O2 Sensors To See How Well The Converter Is Reducing Pollutants In The Exhaust.

The upstream sensor is an a/f sensor and its readings look good. The light is not particularly helpful as it will. (o2) oxygen sensor failure, can cause catalytic converter, meltdown.

The Readings From These Sensors, Should Be Much More Stable And Not Fluctuating Like The Front (O2) Sensors.

If additional diagnosis reveals the sensor is defective, replacement is required. This cycling of the 02 sensors indicates close loop and a balance air/fuel mixture. If a sensor stays lean or rich for a long period of time, lean or rich codes may set.