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-   -   So...P0021 Code Read at shop...What to know about it? (http://legacygt.com/forums/showthread.php?t=197115)

-Samurai- 11-27-2012 09:51 PM

So...P0021 Code Read at shop...What to know about it?
 
Well my car has had this problem for a couple of months now, called the dealer and they told me it was most likely a loose gas cap (Engine light on, with flashing cruise) So I tightened the cap and it went away for a short while. Well it has been off and on 4 times now so I took it to a shop for further investigation and they pulled a P0021 code. They didnt know exactly what it was only that it had to do with cam timing or OCV. They told me to take it to a dealer for further investigation.

Well after doing some research on the code I cant find any real solid information. Came up with a few things but nothing solid. The car seems to run fine when warm, and still boosts fine. But what I have noticed is listed below, any clues on what it actually is before I take it to the dealer. (Let me know if any behavior is normal)

-Car takes a couple seconds to start when ice cold
-When fully warm, car will shake slightly (also at stop signs)
-When cold will lurch (jerk) forward then stop and so on when going at slower speeds
-Burns "normal" amount of oil

To my knowledge as second owner banjo screens have not been removed, catted up pipe still stock, and bought it with non-synthetic oil in it (Replaced with fully synthetic) Currently 89,500 miles on ODO.

Any help would be greatly appreciated!! Thank you in advance!!

Max Capacity 11-28-2012 03:48 AM

You'll need to clean the OCV's, check/remove the banjo filter.

Listen to the turbo, learn how it sounds. If it begins to whine look at replacing it, before it starts to whistle which is just before it blows.


You'll also want to get a catless up pipe, and remove the EGT probe which requires the 2.2kohm resistor in the gray connector the probe came out of.

You may also want to get a tune, because there is a flaw in the OEM MAP that can cause burnt valves.

Then if your going that far, might as will do the DP and get the full benefit of the tune.

-Samurai- 11-30-2012 02:59 PM

Is the dealer able to tune the MAP? Because I believe I am able to get a good deal on this in my situation because I have talked to a dealer before about the light. As for a catless up pipe I know its recommended but Is there a pipe I can use that uses the EGT still? I dont want to mod stuff quite yet. And yes removal of the banjo filter is on my list for the dealer as well!

babybluelgt 11-30-2012 06:08 PM

I'm pretty sure there are after market ones that you can use the EGT with. I don't recommend it though because it could snap off and cause all sorts of problems. I would do it just so I gave the peace of mind.

babybluelgt 11-30-2012 06:27 PM

http://legacygt.com/forums/showthrea...pe-131488.html

Great walkthrough on the resistor install. Relay
pretty easy.

-Samurai- 11-30-2012 09:40 PM

Wow that does look easy. Ill have to see about getting an up pipe then. Whats the best one for the money? I dont want to spend too much. Just need something good but low cost.

babybluelgt 11-30-2012 11:16 PM

I personally have the Invidia on mine. But in my opinion they're basically all the same. As long as it fits and doesn't leak it's way better/safer than stock. The only thing I recommend you do is do some research on whether or not you want one with a flex section in it. Some say to get it, others say don't because it's a weak spot that could rot out down the road. I don't think it's necessary to have. There's a thread floating around here somewhere with a debate about it. I know jnaperformance.com has a cheap generic one for about $90 I think if you don't care about name brands and all that nonsense.

-Samurai- 12-01-2012 11:39 PM

Quote:

Originally Posted by babybluelgt (Post 4181358)
I personally have the Invidia on mine. But in my opinion they're basically all the same. As long as it fits and doesn't leak it's way better/safer than stock. The only thing I recommend you do is do some research on whether or not you want one with a flex section in it. Some say to get it, others say don't because it's a weak spot that could rot out down the road. I don't think it's necessary to have. There's a thread floating around here somewhere with a debate about it. I know jnaperformance.com has a cheap generic one for about $90 I think if you don't care about name brands and all that nonsense.

Alright I'll have to check that out. Thanks!

Also does the dealer do MAP tune? To the better version or updated version?

-Samurai- 12-02-2012 10:27 AM

Well I just checked the drivers side OCV and it looks clean as new. It just must be a bad sensor. Unless the code was thrown for some other reason. Dont have time or money to troubleshoot so I still have to take it to the dealer :(

ripemeat 12-03-2012 02:09 PM

a p0021 will occur when either the ocv is faulty OR if the ocv is receiving less than adequate oil pressure. the banjo bolt, which is the same one that feeds the turbo may be clogged. better check it now or your turbo may be in a world of hurt until it blows. if the banjo filter is clean already then replace the ocv solenoid. it being clean doesn't always mean it's working fine.

-Samurai- 12-03-2012 04:33 PM

Quote:

Originally Posted by ripemeat (Post 4184571)
a p0021 will occur when either the ocv is faulty OR if the ocv is receiving less than adequate oil pressure. the banjo bolt, which is the same one that feeds the turbo may be clogged. better check it now or your turbo may be in a world of hurt until it blows. if the banjo filter is clean already then replace the ocv solenoid. it being clean doesn't always mean it's working fine.

Oh I know I'm having the dealer replace or remove the banjo filter wether its clean or not to be safe. I really hope my turbo isnt damaged if it is clogged somewhat...

babybluelgt 12-04-2012 01:26 AM

Will the dealer do that since it's "modifying" the car? Never brought a car to the dealer so I'm not too sure. I'm sure there's a good walkthrough on here so I would save the money and do it yourself.

-Samurai- 12-04-2012 03:51 PM

Quote:

Originally Posted by babybluelgt (Post 4185655)
Will the dealer do that since it's "modifying" the car? Never brought a car to the dealer so I'm not too sure. I'm sure there's a good walkthrough on here so I would save the money and do it yourself.

Yeah they said they could replace it, but the quote was $575! Im like uhh F that, I can do it myself, I just thought while I was there they could do it. Did not expect that kind of price just for that. Im not mechanically stupid so I can do it its just the time lol. Busy these days. But anyways the code, all they did was do a chemical engine flush, and changed the oil. So we'll see if that fixed it or not... Was $111 bucks.

-Samurai- 12-21-2012 07:54 PM

Update!
 
Well Took it to the dealer, they did an Engine flush, and checked the oil lines for any sludge buildup, None whatsoever. I also replaced the OCV on the drivers side since thats the side the code was for. Drove it another oh, 50 miles? came back on! I have no idea what is wrong with my car. Anyone help or have had the same situation? Thanks!!

ripemeat 12-22-2012 06:16 AM

for what its worth, a tune issue isn't going to cause this code. the map table(AVCS timing advance) tells the ocv to switch and to let oil into the cam sprocket in order to advance its cam timing, the cam position sensor confirms its advance request. when the map table has x degrees of advance requested and the cam sensor is not seeing x, it will throw that code. cam sensors have their own CEL so if it was bad it would probably throw it. another thing is, maybe your timing belt skipped a tooth. that's another cause of the p0021 code. check your timing marks and maybe at the same time check your cam position sensor, maybe it's dirty? it's located on the top side of the head in the back, next to the furthest back injector.


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