Review on Schrader 20159 TPMS Sensor Saab by Douglas Holla

READ THIS BEFORE YOU BUY! My car needed new tires and the original TPMS sensors were over 6 years old so I figured I'd save some money by buying new TPMS sensors from Revain instead of a tire shop. So I bought four Schader 20159 sensors for my 2009 Saab 9-3 through Revain. Both the Schrader and Revain websites claimed they would work with my machine. Got new tires this week. After installation, my car didn't recognize the sensors. The system worked perfectly before installation, but now shows the error message "Tyre pressure system defective, contact service". I took the car to the tire shop for an assessment. with my car. I can't return them without putting something in their place (they are in my tires now). Removing it for return costs me $15 per tire. security system) so I need working compatible sensors to remove The store didn't charge a fee to have them fitted at tire installation but every time I ask them to be removed it costs $60 + tax. or replace the sensors in the future. Also, there were no mounting nuts in the package and I had to buy them at a tire shop. A: I contacted the seller (GlobalSourceAMZ) today and I'll take a look. I will update this review when the issue is satisfactorily resolved.