Volvo: O2 sensor, time tim, wire harness

Question
On a 2000 V70 non turbo what is unique about the pre cat O2 sensor? A universal is available for turbo but not N/A. And have also on several occasions had a P1670 code,what is it? Thank you in advance for your time.  

Answer
Tim,
The sensor (OEM) are made to Volvo specs. They use the wire covering as a tube to gather "reference air" so they are specific to the vehicle. Some also come with an updated wire harness that is added to the existing harness. I have tried aftermarket sensors without good results.
P1670 Immoblizer communication. That would indicate the alarm system is at fault.