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Discussion Starter #1
I have has the same 02 sensor issues for years. It's bank 2 sensor 2, a few years ago this guy worked on it for months, finally fixed it, said he had to rewire it. A year ago or so the code came up again, both times it was because they sprayed the IAC. So I finally replaced the second one about 2 months ago, code was gone and I got a little more mileage.

A couple weeks ago the engine light went on, it was the same 02 sensor and another, bank 2 sensor 1.
Something about and electrical issue and the remedy was to replace the b2s2. So they did, under warranty, didn't work.

So now they are going through all the wires, this is the second day and say I have to bring it back because they didn't get to all of them.

I wasn't expecting all this and asked how much I was going to be charged, because it's obviously not the sensor.

I'm about to tell him to just bill me and stop the work, I can't pay for all this.

Any ideas what could be going on?
 

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Year, model, engine and which code(s) will help a bit. Could be anything from a faulty injector to a bad ECM.
 

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Discussion Starter #3
Year, model, engine and which code(s) will help a bit. Could be anything from a faulty injector to a bad ECM.
Sorry. 2000 Windstar 3.8


P0161
P0141
Code P0161 indicates a fault in the B2S2 02 heater electrical circuit for a predetermined period of time.
Solution-Replace oxygen sensor.

B2S2 was replaced, IAC valve was replaced, code came on about 5 weeks after, B2S1 is a new code, never been on before.
 

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There's not much to the heater side of the sensor. It receives 12VDC to start the heater and it's grounded to the distribution ground. I've attached a video for trouble shooting, but checking continuity across the heater should tell you enough.



Capture.jpg
 
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