Posted by ted regentin on February 12, 2011 at 13:24:21 from (216.110.201.109):
In Reply to: Re: Oxygen Sensor posted by Allan In NE on February 12, 2011 at 06:06:02:
"I'd just about bet that 90% of all O2 sensor replacements are done needlessly."
Just out of curiosity, do you have anything to back up that statement? I do driveability/electrical diagnostics, and I have replaced plenty of oxygen sensors. A good percentage of them are four wire heated sensors that the heater element is open. This problem can be very easily verified using an ohm meter. For the sensors that trouble codes indicate slow reaction or out of range, there are scan tool data streams that show long term adaptives and short term adaptives. Also, some manufacturers use operating cell stratagies that can help verify the problem. I normally can be sure most of the time before I replace an oxygen sensor. After I replace a sensor, I do enough test driving for the ECM to run its monitors that can verify systems operation. There is one specific problem that I will "throw" an oxygen sensor at. Some cars will set catalytic converter efficiency codes. There are times that I cannot be sure if the sensors are causing the problem, or if the cat is bad, so on occasion I will recommend trying new oxygen sensors first, then test driving and recheck the monitors. The reason that I do it this way, is because catalytic converters on some models are rather expensive. By the way, some newer models use something called an "air fuel ratio sensor" instead of the traditional oxygen sensor. I hope that all this isn't too technical for you, Allan, but the point of this post is that there is a lot to proper oxygen sensor diagnostics, and it takes a lot of skill, experience and training to do it properly. My shop probably has over $20,000 just in scan tools and I need a couple more to be efficient. Hope this helps,
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