i thought it was supposed to blink green. i triple checked my wiring and i still got a cel after 10 miles of driving. i bought the 02 sim used with my megan headers, and the guy that had it be4 said it was working. this is how i wired it. the 2 white wires soldered to the signal wires and i spliced the red wire from the 02 sim to one of the power wires and spliced the black wire from the 02 sim to the other power wire. btw i have an 01. please help me.