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If your code is for the O2 sensor heater circuit malfunction, its not an Evap issue, so don't worry about that.
An O2 sensor only works accurately when the sensor is hot (about 600F). When the car is cold, it takes quite a while for the O2 sensor to heat up, so it has to operate without the sensor until then. Nowadays, O2 sensors have heating elements to pre-heat the sensor so the computer can use it faster.
If the system says O2 sensor heater circuit malfunction, it means that the heating element does not have the resistance between the two leads it expects (usually because the circuit is broken). In your case, you either wired it wrong, or the bosh universal sensor has a different resistance than your cars ECU is expecting.
Now, I don't mean to rag on Advance Auto parts, its cool that they read your code for free. My advice to you is that you just have them give you the code number and look it up yourself. My experience with them (and Autozone, etc), is that no matter what the code is, they tell you "its the O2 sensor" without really explaning the code. I have a feeling that you're getting the same code (heater circuit) now that you did originally, they just didn't tell you the full explanation initially. The other thing they usually don't tell you is which O2 sensor it is. Since you have a V6, you should have 3 or 4 Sensors ( I think). One on each back before the cat converter, and one (or two) after the cat converter. Do you know which sensor needs to be replaced? Do you know what the code number is? The code number will tell you which bank and sensor is giving the error.
The second thing to do, assuming that the auto parts store is referring you to the correct sensor thats giving the error, is unwire the universal sensor and do it again, trying not to remember what you did before. I know you said that two people have inspected it, but its easy to get wiring wrong and have it look right. Heck, the wire leads for the O2 sensor might even be labeled wrong. If that doesn't work, then you might have to try an OEM sensor.
That may sound like a lot of work, but worst case scenario is that you have to buy an OEM sensor and put it in. You'll stay away from the mechanic shop at least, and thats something, right?
Hope this helps.
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01 BMW 330Ci - 5spd / 93 BMW 525i 5spd-SOLD/ 98 Camry LE
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) and I think that store was out of them that day. It was after I installed the bosch (twice because I rewired) the diagnostic then gave the heater malfunction which to me shows I wired it wrong but it's right, I swear by it. BTW it's an Actron diagnostic reader is what this particular store uses, I may try a differnet store and get the actual codes and research myself as you suggested. I'll keep this post updated incase anyone else runs in to this issue. Thanks again.
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