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Why does the O2 Sensor on 2001 F-150 4.2 V6 before catalytic converter on passenger side have a square wiring harness instead of a round one like the other O2 sensors?
Wiki User
∙ 17y ago
If the two are near each other it would be so they don't get mixed up ie get the wires crossed. On my 02 F-150 4.2L All O2 sensors are the same (with different wire length) All connectors are the same. The two front connectors (female) look a little different but still plug in the same.
Wiki User
∙ 17y ago
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Why will a lean condition cause a catalytic converter to turn red?
The catalytic converter usually has an Oxygen Sensor before and after the converter. The hot exhaust gases of the exhaust heat up a catalystic and the voltage is proportional to Oxygen. By measuring before and after the catalytic converter, you have a sense if the Catalytic converter is working correctly in cleaning up the exhaust. The exhast to be cleaned up correctly requires the PCM to sometimes run Lean fuel mixture, to clean up NOx, and sometimes Rich mixture to clean up HC (Hydrocarbons). So PCM cycles the fuel mixture between rich and lean many times in the process of driving, so that to get optimal efficiency of the catalytic converter. However, if you have a vacuum leak, your engine will run LEAN and the PCM will compensate and force it to run rich instead. After a while, by running rich too much, you are throwing unburned fuel into the exhaust pipe, causing Catalytic converter to become Red hot and causing it to fail. So in short, running Rich, not lean, can cause converter failure.
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