OK you said you replaced the immobilizer. Did you get a key fob (the plastic part the key blade goes into) with the immobilizer and the ECU from the same car. Generally you can purchase all 3 from the same car which should be the same model and year as your car. In your case a 2003 or 2004 Boxster S with an automatic transmission would be the best match.
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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