Welcome to the W201 no reverse club. My '93 2.3 reverse just went out at 117K miles. All forward gears work perfectly, but reverse works good enough when cold, but not so good when hot.

Good luck, I hope you post if you find a fix.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible