The "error code 02" they are talking about is "Measurement error – insufficient data." You get that error when there's no jammers installed. It just means that it's not receiving enough data back to get a read. It could be that the car is too far away or any number of things.
Error code 07 on that gun is when it thinks it's being jammed.
http://www.teletrafficuk.com/pdf/man...ralyte-100.pdf
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