I had a CD9304 code on my 2011 BMW 528i. I was skeptical at first but from the time i first reached out to ECU PRO to the time they sent back my DME back, the guys at ECU Pro were super prompt, helpful and super professional. The whole process took a week. The team was able to replace the defective part and also replace another capacitor that was marginal. The whole process took exactly 7 calendar days including shipping back and forth to ECU pro. Super quick service, transparent and fair prices. The repaired dme was plug and play. Highly recommend the company