[HikinTech]

Sorry it took so long to get back to you. I do not get on this site that often. Normally the leak is coming from the seal between the intake manifold and the DISA valve. When you had the DISA valve out was the flap ok? The pin falls out and the flap will not operate properly. I'm not use to the codes you provided (most likely due to the tester), but I believe the 2882 & 2883 are indicating a fuel mixture problem. Normally on that engine its a lean issue (unmeter air). I listed off the most common issues and 70,000 miles sound like the DISA valve. I reread you OP and the only other cause for concern would be the 276D Tank vent valve. If this component was open all the time you would get unmetered air. I believe that code 20 is being cause by the other faults, but if you wanted to prove that one out, swap injectors from cyl 6 to another cyl. I hope this helps - it's really difficult for me to tell you to replace any component from my computer. You need to prove that the component is the cause. With that said, if you ran the vehicle and sprayed the cleaner around the DISA valve and the idle changed that I would go with a DISA valve, if the flap inside the DISA valve was damaged then - replace DISA valve (weather or not it fixes for issue, it bad). I hope this helps. I will check back on this post probably tomorrow. Good luck.