Noticed my scan master O2 readings are very low (30-45) at idle and crusing. At WOT, reading goes to zero. Just reving up in driveway will cause reading to go to zero. Fuel pressure at idle is 42psi and WOT is 68 psi at 25 psi turbo boost. Car runs strong at WOT with no retard. No error codes are showing up on the scan master. The O2 sensor is heated and has been in the car about 3 years. Do you think the sensor is bad? See signature for set up. Thanks.