When you have Foxwell NT520 or Foxwell NT510 to communicate with the BMW models with 20 pin under hood connectors, you must have one BMW Round 20 Pin to 16 Pin OBDII cable.
I enlarge the image of BMW Round 20 Pin to 16 Pin cable that you need:
As known, the BMW models made from 1987 to 2002 come with 20 pin diagnostic socket under hood:
| Make | Model | Submodel | Engine |
| BMW | E30 | 318i | M10 1.8L |
| BMW | E30 | 318i | M42 1.8L |
| BMW | E30 | 318is | M42 1.8L |
| BMW | E30 | 325 | M20 2.7L |
| BMW | E30 | 325e | M20 2.7L |
| BMW | E30 | 325es | M20 2.7L |
| BMW | E30 | 325i | M20 2.5L |
| BMW | E30 | 325is | M20 2.5L |
| BMW | E30 | 325ix | M20 2.5L |
| BMW | E30 | M3 | S14 2.3L |
| BMW | E31 | 840Ci | M60 4.0L |
| BMW | E31 | 840Ci | M62 4.4L |
| BMW | E31 | 850Ci | M70 5.0L |
| BMW | E31 | 850Ci | M73 5.4L |
| BMW | E31 | 850CSi | S70 5.6L |
| BMW | E32 | 730i | M60 3.0L |
| BMW | E32 | 735i | M30 3.4L |
| BMW | E32 | 735iL | M30 3.4L |
| BMW | E32 | 740i | M60 4.0L |
| BMW | E32 | 740iL | M60 4.0L |
| BMW | E32 | 750i | M70 5.0L |
| BMW | E32 | 750iL | M70 5.0L |
| BMW | E34 | 525i | M20 2.5L |
| BMW | E34 | 525i | M50 2.5L |
| BMW | E34 | 530i | M60 3.0L |
| BMW | E34 | 535i | M30 3.4L |
| BMW | E34 | 540i | M60 4.0L |
| BMW | E34 | M5 | S38 3.5L |
| BMW | E36 | 318i | M42 1.8L |
| BMW | E36 | 318i | M44 1.9L |
| BMW | E36 | 318ic | M42 1.8L |
| BMW | E36 | 318ic | M44 1.9L |
| BMW | E36 | 318is | M42 1.8L |
| BMW | E36 | 318is | M44 1.9L |
| BMW | E36 | 318ti | M42 1.8L |
| BMW | E36 | 318ti | M44 1.9L |
| BMW | E36 | 320i | M50 2.0L |
| BMW | E36 | 323i | M52 2.5L |
| BMW | E36 | 323ic | M52 2.5L |
| BMW | E36 | 323is | M52 2.5L |
| BMW | E36 | 325i | M50 2.5L |
| BMW | E36 | 325ic | M50 2.5L |
| BMW | E36 | 325is | M50 2.5L |
| BMW | E36 | 328i | M52 2.8L |
| BMW | E36 | 328ic | M52 2.8L |
| BMW | E36 | 328is | M52 2.8L |
| BMW | E36 | M3 | S50 3.0L |
| BMW | E36 | M3 | S52 3.2L |
| BMW | E38 | 740i | M60 4.0L |
| BMW | E38 | 740i | M62 4.4L |
| BMW | E38 | 740iL | M60 4.0L |
| BMW | E38 | 740iL | M62 4.4L |
| BMW | E38 | 750i | M73 5.4L |
| BMW | E38 | 750iL | M73 5.4L |
| BMW | Z3 | 1.9 | M44 1.9L |
| BMW | Z3 | 2.3 | M52 2.5L |
| BMW | Z3 | 2.5 | M52 2.5L |
| BMW | Z3 | 2.5i | M54 2.5L |
| BMW | Z3 | 2.8 | M52 2.8L |
| BMW | Z3 | 3.0i | M54 3.0L |
| BMW | Z3 | M Coupe | S52 3.2L |
| BMW | Z3 | M Coupe | S54 3.2L |
| BMW | Z3 | M Roadster | S52 3.2L |
| BMW | Z3 | M Roadster | S54 3.2L |
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