Hi guys Got question and problem, maybe someone can give us tips. Vehicle SL500 6.0 Bj.91 129 0661F005606. right in the engine compartment, under the cover are two controllers installed. The units look identical, are plugged in one after the other. Not every SL seems to have installed these controllers, also have a Bj.90 without them. So, now to my problem: with a controller a PIN is broken. If it is replaced, it can be repaired. And basically for understanding s and interest, what do these controllers serve?? The car has a problem – starts well, but engine runs completely restless as if petrol control is defective. Our guess – because car mechanically and electrically so far in good condition – it is related to this controller, or whatever that is. In attachment a few photos. Happy mic skins every feed-back. Best regards. Gerhard