I know this gets thrown around a lot but I'm having trouble getting the p1110 code to go away in my 2000 Aero. I dropped a motor from an 08 in it and ever since, I can't get the light to shut off. I've had parts galore from two other 9-5s and I've swapped the charge bypass valve three times and replaced all my vacuum lines without any luck. I'm looking Into replacing the vacuum valve towards the firewall but I was wondering if any of you guys knew of a testing procedure for it? Also is it normal for these cars to have two different valves? I've been scratching my head at this for quite some time and was just wondering if anybody has a complete list of things I can try to get the DTC to go away. Thanks mates.