Group, I am at wits end. I have tried all the things suggested by the post on how to fix a 16618 code. Initially my CEL came on and I hooked the VAGCOM up and received the code 16618 (intermittent). When investigating I found that the actuator rusted away. I replaced the actuator and in the process found that my vanes in the turbo moved freely (I cleaned the intake at this time). I set the linkage to the same length as the old one. Unfortunately the CEL never went out. I replaced all the vacuum hoses, still did not work. I switched the solenoids (swapped the gray one for the black one) but CEL still on. I replaced the MAF but the CEL is still on. I cleaned the snow screen and replaced the air filter (another suggestion) but no luck. I do not know where or what to do now? Any suggestions or help. CEL is on and I need to get it inspected. Thanks for any suggestions.