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Lambda sensors


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After replacing both lambda sensors on my 2008 Rio, I have noticed that the check light sometimes illuminates and then extinguishes a few days later.
After connecting my OBD metre, it indicates that the post catalytic converter sensor is malfunctioning. However, when I had it inspected at Kia, they reported no problems.
Does anybody have any suggestions?

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Malfunctioning felines will often regurgitate an error code. I have seen that Max inquired about the logging of a code and you are planning to verify it.  Another method of identifying a defective automobile is by olfaction, namely by detecting an unpleasant odour like that of rotten eggs.

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There is a fault in the heater circuit of the bank.  There is one sensor, number two.  Or anything said in a very same manner.
I am uncertain if the female terminals are located on the engine loom or the sensor loom side.  If the wires are located on the engine loom side and you still have the original sensor, you may extract one of the wires, together with the crimped-on terminal, from its plastic socket. This wire can then be used to assess the tension of the female terminals in the corresponding socket.  It is possible that the weak tension might be due to someone tampering with and opening one of the probes during diagnostic.
Is the heating circuit supplied with a 12-volt power source?
It is necessary to inspect the continuity of the wires connecting the ECU socket and the sensor socket. Typically, the resistance should be below 0.4 ohms, while Kia specifications allow for a resistance below 1 ohm.  Additionally, ensure to verify the continuity between the wires and the ground. It should exhibit an infinite resistance (indicating an open circuit). If any megaohms value is obtained, it is imperative to thoroughly investigate any potential electrical leakage to the ground.  I have seen instances where looms coming into contact with the side of the ECU bracket have resulted in many engine loom problems.  I have had instances when the wires have broken within the protective covering next to the tightly secured connection point. As a precautionary measure, I often apply a little force to each wire at the back of the socket (specifically the end of the wiring harness near the sensor, not the electronic control unit) to check for any signs of weakness or breakage. After completing all the necessary tasks, it would indicate that the new sensor is defective.
Although uncommon, it is possible for the sensor itself to be defective, even when using components provided by the dealer.
I trust that the information provided is beneficial.

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