^not tune related, had GIAC and retuned with EPL this year, Tony has also agreed its hardware side, not software. The GIAC 'fix' is probably just turning off the related emission monitor.

 

All these replies are very encouraging. I really wish I received them last year when I originally started this thread but better late than never.
Looking back on when the p1145 actually started, I already had the whole Alpha 28 upgrade package from EPL done for 6 months and then I swapped my exhaust from EBWerks to SpeedTech. A day or two after the exhaust swap it started. I went through every piece of the exhaust and it has been off a couple of times since then without any change on the CEL appearance every 2-3 days.
O2 sensors have been replaced (twice!) fronts AND rears, gaskets replaced, even sealed with Ultra Copper to help. Just for fun I did a 25PSI boost leak test this weekend also. It held perfectly until the plug I made for the turbo not receiving compressed air slid off the flange and slammed into my lower control arm. That is a noise I won't soon forget! Nothing was damaged but it scared the crap out of me.
After the lifters I was sure I had this CEL wiped out for good.
Wow it is great to have my car back though!

 

did you replace the rings on the camshafts? Were any missing? Aka was that the metal shavings? Did you find out what the metal was (magnetic or not?). I've seen the rings fail before....

 

The source of the metal was never revealed to me and I don't really think the shop knows either. To put it in perspective, the shavings were non-ferrous and I had to dig deep in the filter element to see them None were more than a hair's width and did not appear until I waited 2000 miles to change my oil. For all I know they are normal wear.
If one of the rings on the cam failed they didn't tell me about it. They were insistent that the cam actuator mechanism was not working properly. Maybe it was one of the rings failing but I will never know.

 

After talking to james I do remember an 01 from last year that had that same code and when we took it apart he saw one of the three rings was gone

 

^ referring to O-rings on the Variocam actuators?

 

Installed a factory airbox(with same MAF as before) and a set of 200cell catted straight pipes(without the secondary O2 spacers I had on my old setup) about a week ago, P1145 and P1155 are now gone/fixed...
-Rob

 

Oem air box with a bmc filter is the way to go. No drama. Or a stock paper one.
200 cell cats will do the other job.
I always say go back to basics of you want to find the solution.
Good job
Markski

 

have you given any thought to modding the oem box with another vent on the drivers side like the 997t? it seems to make sense and there is no downside i can imagine. paper filter all the way. i think that bmc is a waste of time at best. i can't speak on the evoms/fabspeed intake i just know i've never had one cel since bailing that bmc.

 

my Milltek is also catted so don't think there was any issue there, however I did not use the secondary O2 spacers when installing the new pipes...could also be the old exhaust flanges were warped/leaking...don't think the airbox made the difference but could be...running a new paper filter too.
Maybe I will check the flange flatness/trueness on the Milltek exhaust...
I'm a happy camper regardless...thanks guys!
Cheers,
Rob

 

I remember you gave me this advice $12000 ago and I wish I had listened! I hope to hell this shop gets it resolved soon.

 

Yes I do... fingers crossed good luck
markski

 

I waited a few weeks to be sure the CEL was really gone...and it is! I posted this over two years ago and have gone through hell trying to get rid of my p1145...just read the 6 pages of this thread to see. From the obvious stuff like O2 sensors and checking to leaks, to the moderately difficult items like swapping and replacing injectors, to the completely unnecessary and expensive replacement of my lifters that were all in perfect condition upon removal (which ended up causing me to go to court over poor workmanship and a second mechanic at double the original cost to fix the first mechanic's mistakes) All to get rid of this CEL. It has been a long road to say the least.
I read the post by 993GT above months ago and thought to myself "removing the extenders on the secondary O2 sensors? no way it could be that simple" but in the back of my mind I thought, next time I have my exhaust off I'll try it. Well, it was smog check time this month and I put the stock exhaust on. Noticed I had no CEL for a couple days. Then I put the Speedtech back on, this time without the extenders on my cat delete pipe. I've driven it for 2 weeks now without a CEL, and the AFR readings between banks are identical which proves to me that the problem is gone.
If you've read some of my descriptions of the problem, it would start with the AFRs growing apart on bank 1 and bank 2, which is the cause of a p1145. After 2-3 days of driving, like clockwork they would start to differ, and then the CEL would appear. I reset it, and the process repeated over and over until now.
I am so happy it is finally fixed!!!!!
Markski, and 993GT were so right...it's the simple stuff.

 

There you go it's always the simple stuff and in most cases human error - like adding dvs or the Ipd plenum - you create drama of not done right. Or better yet, if not pressure tested.
90% of these cars don't even have a pressure test done. Guys just buy a OTC tune, then get rs Ics because they all believe in miracles, then rheow on hoses that don't seal up, pick up some turbos from eBay with who kneels what in it and where the Wgs are set , then drop it off to some body shop ( not a car shop) because it's cheaper and expect things to go smooth. This is the reality. I may sound like I'm complaining. I'm not. Just sometimes it's frustrating when guys call me and half of the calls are issues with existing set uos asking for help. Had you don't it right the first time you would not have these issues I tell them. Thus , if it's too good to be true it usually is.
If your tuner doesn't take responsibility for the cars performance, status , nor pushes you to be on top of it like with boost leak tests etc, I would think twice because that person is the one that's calling me in 6 months when things go south. its a never ending story, I have 2 such emails just today. Yesterday, I looked at a 996 with a misfire he's had after Doing coolant lines with some Porsche Indy. He had 3 vacuum leaks yet he made them do a pressure test with my unit. I sat there showed him the leaks and he shook his head. But it's gets even better. He has a popular kit running the hitachi with turbos w/ Wgs , injectors , Ics , etc. I logged the car it's running only 1 bar. I asked have noticed that ? His answer was I though this is how it's supposed to be ( they reflashed it with the Hitachi Maf last year. I said , I strongly suggest you get a hold of them and send the log.
The educated you are as a consumer the more value you will get for your money. Not to mention, a smile on your face when your in the car.
This is standard issue with these cars and the service you pay for. The good guys are and in between. So choose wisely.
Best
Markski

 

Congrats! The p1145 p1155 code seems to be related to compared air/exhaust flow over the O2 sensors...modern Bosch E.M. is able to determine flow.
Cheers,
Rob