xander032

Hello there,

I bought a 2001 stock 996tt (110.000km) about three months ago and have driven this for about 4500km. A Porsche specialist did an examination on it and the car seemed good. But I've ran into some more trouble that I think I should so I would just like your help and to know your experiences.

1. PSM + ABS faults:
The codes are P0410 and P1411. This happens when:
Engine idles after driving for a while (when engine has warm/hot temp).
The RPM starts fluctuating (down) a bit.
Always comes on together.
Never happens while driving.
Never happens on cold starts (and idling).

2. Brakes
Make a squealing sound when braking on low (traffic light) speed.
The specialist confirms he put stock rotors and pads on but they are black pagid pads. Are they meant to be black pagids? Or is stock another brand?

3. Power steering fluid leak
The power steering fluid started leaking quite bad as well. I had to fill up the reservoir with about 0.8L of fluid. The specialist tells me then engine has to come out to replace one of the lines which he thinks is leaking.
I am wandering whether the engine really has to come out and whether anybody has had this problem as well?

Looking forward to your replies and thanks for you help!

Kind regards,
Sander

trendy996

I would check the rack but, the lines are know to leak as well. I didn't have to drop the engine for the n/a 3.4l 996 motor. I can't imagine it's much different. Race pads or similar compounds cause that noise under light braking. Stock pads would be from porsche. There's equivalent pads but, if you're going to say stock then they should be from porsche.

996tt6156R

You need to replace your maf sensor.

You don't want the power steering fluid to get on the headers. It's very flammable and it eats paint.

"02996ttx50

you have two SAI ( secondary air ) codes. so you need to have someone check the Secondary Air Pump for faults etc. btw they would probably be "0410 and 0411" and not a p1411.

also, pagids aren't stock. he or whomever/wherever replaced the pads, probably put the cheapest oem ( or equivalent ) pads on ( textars .. maybe even mintex ) which squeal.

try a couple of very hard stops that will often remove any residual buildup on the pads/rotors and stop the squeal. but textars squeal anyway. cheap.

the PS reservoir shares fluid with your clutch system and the usual source of a leak of fluid is from either the clutch slave or the accumulator.

my advice to you would be to find a mechanic that tells you what is leaking, rather than one that tells you what he "thinks" is leaking and there is NO PS "line" that requires an engine removal to replace. you need a new mechanic, seriously. GL w it.

""The RPM starts fluctuating (down) a bit.
Always comes on together.
Never happens while driving.
Never happens on cold starts (and idling).""

cold start has a richened mixture and idles at 1100 rpm and should settle to 750 as your SAI shuts off. what do you mean when you say "idle fluctuates down?" do you mean; "down".. "as it warms to operating temp"? if your idle "hunts" ( fluctuates after the car is at operating temp ) or stays at 1000+ and above, you can get an "idle high "code".. that could indeed be bad maf ( or vac leak ) related.

it's clear your issue doesn't occur on a cold start? but.. either way, you'd be well served by finding a new tech/shop.

BioBanker

Hows your alignment?

My car threw ABS and PSM under the same circumstances that you observe. Fixed it by an alignment (steering position sensor caused fault). I dont recall the codes.

fpb111

Let us know where you are so we can give some known good shops in your area.

1q2w3e4r

He's in Rotterdam (Holland/Netherlands)

xander032

Thank you all for responding and helping me with these issues. To answer your questions:


1. Yes, I am based in Rotterdam.
2. PSM + ABS; The codes are really P0410 and P1411. These are errors in the Secondary air system bank 1 & 2. These are the active codes. Another passive code I get is P0102 which is the MAF.
3. On the fluctuating RPM; Only after I get the errors (PSM + ABS), the needle will hunt but mostly to the downside compared to up. I don't have the errors on cold starts but only after I've driven for a while and I run idle in front of a traffic light. Thats when the errors (ABS + PSM) pop up.
4. Brakes; so my brake pads are not stock but Pagid. So its a choice of hard stopping power and squealing or putting actuals stock pads on? Problem solved.
5. Power Steering fluid leak can be a lot of things I guess. The clutch has been replaced recently for which the engine and transmission was dropped. I don't have any leaks at the front of the car.


Two open points then:

Power Steering fluid leak:
Rack
Lines
Hoses
Slave cilinder
Accumalator
This obviously needs more visual investigation.


In which case does the engine have to be dropped?


PSM + ABS:
MAF
Alignment sensors
Brake light (read in another thread)


Anything else?

"02996ttx50

new to me a "P1410" code. usually its a 1410/1411. still reads like the SAI pump acting up. they do "die" and "act up" first.

and yet,..this all reads like a vacuum leak esp with the idle hunting and accompanying CELS which could even be caused by or compounded by a bad MAF.

i personally have never heard of any line requiring an "engine drop " to r&r anything having to do with either a PS pump OR a clutch slave or accumulator. ( again.. both a leaking slave as well as a failing accumulator can and will drip pentosin. )

it would help if you mention from what area of the car you see ( if you even do? ) the leaking pentosin and/or if you have a "spongy" or it is "more" difficult ( unassisted ) clutch when you engage it with the motor "off"? or any inconsistent clutch feel(?) . also, an engine can be "lowered" a bit simply by loosening the motor mounts at the rear of the car in the engine bay. this is usually enough of a "lowering" to grant access to the removal and replacement of accessible albeit tightly packed parts in the engine bay.

a "full clutch" replacement job ( by way of example ) does not even require a "full" engine drop. no reason to suspect that getting to your pentosin ( PS and hydraulic clutch fluid.. ) "leak" should either.

btw re brake pads. perhaps i wasnt being clear. while textars and mintex are considered "oem" equivalent replacement pads, the textars are known to squeak/squeal and a cpl hard stops often 'un"glazes them enough for the noise to subside. still beware.

last note.. keep in mind that the "abs/psm - drive to workshop" dash error message is a generic message and will appear most any time you have a hard/soft code than can be cleared yourself with a handheld OBD reader, irrespective of what the actual "issue" might be. you'll see the "generic" psm/abs error fairly "often" when stuff is slightly amiss, and i NEVER just "drive to the workshop" absent a catastrophic failure of a critical component lol as half the time, that "message" is a "fear factor" kind of thing !

996tt6156R

Forgot to say one of your diverters are leaking I would vacuum test them. If any of them leak when cold starting it will throw both codes.

Carlo_Carrera

Yes, check diverter valves and MAF.

1q2w3e4r

any updates??

xander032

Haha, thanks for the video. At least something to laugh about!


The brakes I will accept as is but they will change some rubbers and put on different vibration plates to see if it will reduce the squealing.


For the power steering one of the cables is leaking which has to be changed.


For the PSM and ABS they suspect its the MAF. Unfortunately it is only suspect as with these faults it can be a lot of things and its a matter of mechanical fault finding instead of knowing for sure what the problem is based on electronics.


Its probably not the best 'first Porsche experience' but I hope after this is will be done for a while!


Thank you for all your feedback!

"02996ttx50

true enough, but any decent mechanic would be able to ascertain that the maf was fried/dirty. i just replaced mine and it cured my idle hunting issues. I've said that again lol.

i got a new bosch part# 124.00 on eBay for 180$. its worth 180 to throw a new maf at the issue and it takes 30 seconds to install. plus a minute and fifteen seconds to reset the TB after the new MAF is installed. no new maf ever hurt anything, but it sure can cure a lot of curiously frequent abs/psm cels. should try it.

996tt6156R

If it's the sai code then it's most likely your diverters are leaking. Take the vac hose off of the diverters and buy a vac pump and if it doesn't hold there's your issue.