In Ray's defense, I actually had a couple other mechanics tell me even more bizarre stuff to try to fix the problem (change fuel filter and catalytic converter) and the dealer told me that that was the first ECU they've ever had to change because those things have insanely low failure rates, so I think that Ray was just going with the most likely case of what the problem was. Dave
John,
I am not the one who told Dave to get the third sensor. I rarely tell anyone to replace parts to fix a problem because that is the worst possible way to go about the task, especially if the part is not checked or inspected first. I post quite a bit here, and if you read a lot of my posts, you should note that my advice is almost always to check a component.
When I told Dave that he got some bad advice (I was referring to the advice from another poster to replace the sensor) I wasn't referring to your advice.
I did advise to get a Denso sensor the next time he needs one, and you and I will have to agree to disagree on that one ;-)
As far as the sequence of diagnostic tests, I wanted to make sure that the wiring between the sensor and ECU was repaired and not shorted to ground before suggesting replacing the ECU so that the replacement ECU wouldn't be damaged. Since ECU's tend to be very expensive, I don't like recommending replacement until everything else has been checked.
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