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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
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Dear customer what happens is that these sensors usually give the headaches to be diagnosed because there are two sensors one that comes before the catalyst and one that comes after the catalyst sometimes when we perform the diagnosis we can not say frar which of the two sensors is the one that is really giving problems, this depends a lot on the experience of the technician I personally know the ranges and operating parameters of the sensors this allows me to determine which of the sensors is out of normal operating range and based on this to perform The replacement. In addition, many times when we have codes referring to the exhaust sensors it does not mean that the sensors are defective because these sensors are in charge of measuring the state of the mixture of the cylinders through the exhaust gases, so the sensor may be detecting that the mixture of the cylinders is not correct, but it does not mean that the sensors are defective. In such cases a check of the fuel injection and air intake systems should be made.
The truth is not so expensive because nowadays there is equipment that allows to check these injectors are known as test bench also these same equipment can clean the injectors and in most cases with the cleaning usually fix the injectors as it is very common that the indicators are clogged by dirt is cleaning helps to remove all the dirt and the injector is working normally.
I hope this info to be helpful, my goal is to give you the best advice i can, I hope to be helpful, if you have any doubt or want to know anything else please do not hesitate to reply back.
Kind regards, Sebastian.