Fault code P0021 timing is off?

Hello! I've had my C4S for about 4 weeks and I'm starting to get a pretty accurate picture of the car and considering that I paid about US $10k under market price for a C4S in Norway, its not so bad :-). However, I do have this one thing I'm trying to figure out and that its the P0021 fault. Please se attached pictures from Durametrics on my car. Been reading up on all I've been able to find on this, but the more info and input I can get the better I think. Some information: * There is no CEL. There was one and I took the car to Porsche locally, they found this error and a lambda error. Cleared the codes and the lambda one has not returned. * The car runs fine as far as I can tell * As far as I know, it's not running especially rough either (actually my voltage regulator is a bit wonkey so its kind of rough when the voltage drops up and down but it "feels" electrical and not mechanical, but who knows)

Oh that lambda error.... Uh oh

Uh oh? I don't know if I like "uh oh" ;-).

DME 7.8 P0021 Position of Camshaft in Relation to Crankshaft, Bank 2 – Below Limit Diagnosis conditions • Idle speed • Reference mark recognized • Engine speed between 600 rpm and 1200 rpm. • Engine temperature greater than 40 �C • No fault in camshaft position sensors • Reference mark OK • No fault in camshaft adjustment • No fault in engine temperature • No fault in camshaft adjustment output stage Possible fault cause ♦ Allocation of camshaft to inlet camshaft incorrect Affected terminals - Diagnosis/Troubleshooting This fault is stored if the engine was disassembled and the allocation of the camshaft to the inlet camshaft was incorrectly set. Work instruction Display OK If not OK 1 Set camshafts ♦ To adjust the camshafts , please refer to the 911 Turbo (996) or 911 Carrera (996)

I have seen that before. cant recall right now what the culprit was but it wasnt HUGE....I seriously cant recall the fix. i would not drive it though and get it fixed asap - if I remember i will post

Cheers, please do . As for the fault, with timing it's sort of a "hit and miss" (Quite litterally, do mind) thing. The original P0021 came, according to Porsche, at about 105.000 km. The car has now done ~115.000 km. If the timing has been messed up to the point where the valves has kissed the pistons it's been doing it for a very long time (relatively, for an error like this anyway). That is the only reason I'm not all that worried about driving it still. Porsche was not all that worried about it either, but then again - they could possibly see a future new engine in it for them ;-).

IIRC it had idle issues and when at speed the other side came into the same range so your thoughts "could be" correct. its a 3.6 right?

It's a 3.6 X51, yes. At a friend in the car just now, hooked up the laptop and at least the deviation stays more or less the same all the time. Do note "more or less", it's not jittery or anything indicating IMS failure, but there's definately not the 100% same value while going through the revs. I'm a bit reluctant to define it as idling issues, but as soon as the secondary air thingamajingey has done its thing and it lowers down towards 800 rpm its *not* rock solid at 800.

Quotes source post: 8807455

I checked my sources and all I have is what 911Slow posted. No test/diagnostics steps. Based on the absence of any test/diagnostics steps and the absence of any other symptoms, I'd suggest -- if you want to go to the trouble -- is to find the related electrical wiring harness connectors for the actuator solenoid and sensors and carefully disconnect them then reconnect them. The fault could be do to a marginal electrical contact. Also, almost always when something inexplicable like this pops up related to the valve timing especially with a car that is unknown to the owner I like to as about the oil. I assume the oil level is correct and the oil is of the proper type/grade and doesn't have too many miles on it? Sincerely, Macster.

Sometimes we tend to over-think things. This could be a hall sender or it's wiring going wonky, as Macster has pointed out. Or the "computer" is right and it could be the timing is off some how, perhaps the ims tube sprocket has slipped over time on bank 2 (according to Jake I've read this can happen), or it skipped a tooth somehow, or for some inexplicable reason the camshafts were not allocated properly during removal and re-installation. You did mention idle not normal right? Could indicate timing is not 100%, but the DME is "good enough" to compensate for a serious discrepancy (-12.7 degrees on bank 2). Anyhow, have it checked out. A lot "less expensive" to address now rather than later when you have misfires and/or piston/valve contact. Also I hate to bring up oil as well to avoid oil wars, but agree with Macster's suggestion.

Thank you all for the feedback and suggestions. I see that I have managed to forget to mention a few quite possibly important facts here. * The car has now done ~115.000 km * The engine was rebuilt at Albert Motorsport in Germany at about 104.000 km (new block, cylinders and pistons if I don't remember it wrong) * The AOS was replaced at about 105.500 km, also by Albert Motorsport * One set of chain tensioners have been replaced at about 109.000 km in April 2011 As for oil; the car is running on 5w40 and should have been replaced when the tensioners where replaced about 6000 km ago so the oil should be pretty much ok. It's currently sitting at the "max" level, ie one "bubble" away from max in the cluster which pretty much correlates with the dipstick as well. Considering the work that has been done to the engine over the last ~11.000 km, having the timing being wrong is technically possible. The strange thing is though; when I had the car at Porsche locally before I got my durametric, they got this same P0021 and they claimed it had been there since about 105.000 km. This is for all intents and purposes a bit strange as the car has been diagnosed by Albert Motorsport since then (last time was at 109k as mentioned above), but what do I know. I'd love to check the electrical connections for the solenoid, I'll try to look into it and figure out where it is.