Quote:
Originally Posted by oldskewel
That's what I'd look for first. Or even just a connector that is not fully plugged in. Odd for it to show up suddenly after all that work. Bad for the mechanic to deliver it to you like that.
I recently replaced the pre-cat O2 sensors in my 2001 3.0, where they were working fine but at 169k miles. I thought I might see an increase in MPG following the change, but it runs just like before, which is very well. So the O2 sensors can go for a long time.
If I had just spent $3k on repairs, my first step would actually be to ask the mechanic about it and if he will inspect and fix for free if indeed he tweaked it.
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I did go back today and asked if he had touched the O2 sensor in any way and he said no. I would trust the shop that I go to with any car (I know the mechanics on a personal level). It sucks but ultimately the sensors both have 97k on them so they should be replaced anyway.