Quote:
Originally Posted by Ron07x5
They definitely are wear and tear items. The fronts are really torn by the high heat.of exhaust. Wish they lasted forever but they do not. They are not cheap either. You are right one can wait for them to go out of spec to the point you get check engine codes but this isn't good for fuel economy or catylictic converter life.
cars trim adjust the air to fuel mixture by the information from the o2 sensors. As the 02 sensors wear can give increasingly bad info and then the "fuel trim" goes increasingly bad. Rough running and poor economy would result. Also threatens life of catylictic converters. Fyi google "odb2 fuel trim".
Fyi I took a mechanics emissions class at golden west college like 6 years ago and got an A. One can determine a lot with the emissions numbers via odb2 and engine exhaust gases.
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I am not going to argue with you here. It is your car and your money, but if you go this route you have to change at least the MAF too because he also gets de-calibrated over time and it is also a factor in the short and long fuel trim adaptations. However there are a few very important facts that you are missing:
-The pre-cat sensors in your car are so-called wide-band O2 sensors. You can Google, but in a few words they are sensors with a very precise readings. Compared to the regular O2 sensors of the yesteryear is like comparing Huyndai Pony to BMW M3. The DME will figure out something is out of spec long before you will find some difference in the MPG, let alone a danger to the catalytics.
-Post-cat sensors do absolutely nothing for the fuel economy or to protect the catalytics. They are there to monitor their efficiency.
-All 02 sensors are made for heat. As a matter of fact they dont even work when they are cold.