Item Type: Coil Checker Material: ABS Fitment: Replacement for MeredesBenz 19982010 Usage: Replacement for Benz car model: Put Easy-Checker on the EIS, put your IR key into EIS. Light on and not off, then EIS and key all ok Light on then off, then EIS ok,key not ok Light on and not off but car still can not start, please check ESL Steering wheel lock and Key whether ok. Light not on,then EIS not ok. EWS system: Put Easy-Checker on EWS(no need insert key) Light on means EWS ok(can used on:E46/E39/E53) Insert Easy-Checker into EWS(insert key in) Light on not off,then Key and EWS all ok Light on then off, then EWS ok, key not ok Light on and not off,but car still not start, please check whether key is ok CAS System( for 1 series/3 series/ 5 series/7 series) Put Easy-Checker directly on CAS and insert key in Light on and not off, then CAS and key all ok Liht on then off, then CAS OK but key not ok Smart Key slot-key Put Easy-Checker directly on the EZS and insert key in Light on and not off, then EZS and key ok Light on then off, then EZS ok,key not ok Package List 1 x Coil Checker 1Perfect Fitment: Immobiliser system diagnostic tester tool is replacement for MeredesBenz 19982010, perfect matching your car. 2High Quality Material: Easy checker is made of high quality ABS material, wear resistant, anti aging, lightweight, high strength and durable. 3Application: Auto lock inspection loop tool is indispensable for locksmith or key programmer, more convenient and practical. 4Function: If light on means the lock no problem; if no light on means the lock loop have problem, easy to use. 5Professional Design: Professional manufacturing, exquisite workmanship, stable performance and high reliability, have a long service time.