Could just buy a code reader for around $50

https://m.harborfreight.com/zr4-obd2-code-reader-63808.html

Find a 20 percent coupon and your golden

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero