p 0411 code question and coolant leak question....

[bobbittle]

Hi all, two questions (hopefully easy to answer!).

First off, I've had a p0411 code for a little while know and noticed today while nosing around in the engine that what my manual id's as the crankcase ventilation pressure regulator valve has a large split in the side of it....possible that this is causing the code? Expensive part? Easy fix?

Second, I've been hunting for a small/slow coolant leak for awhile and again, while nosing around the engine I think I finally located it. It looks like the plastic piece that the coolant temp sensor plugs into is leaking when it going into the block/engine/whatever....again, easy fix? Expensive part?

Thanks for any help!

[Too Cold NB1.8T]

CRANKCASE VENTILATION>PRESSURE REGULATOR VALVE#034 129 101 B approximately $25 from the VW dealer, very simple to replace.

Three way plastic water junction near the upper radiator hose inlet, the junction has a temp. sensor in it, I don't believe the junction is more than about $10 and the switch #357 919 369F is about $19, I don't have a P/N for the plastic junction.

If you are referring to the Green sensor near the cylinder head, I don't know the price and P/N of the piece it fits into but replace should be pretty easy.

[bobbittle]

Thanks for that info!

The plastic piece I'm referring to is right next to the engine, so I believe it's the second one you listed. Did you get the info from a website that I could browse through?

Also, anyone else know if the regulator valve could be causing the p0411 code? I imagine I should replace it regardless but it would be nice if I could kill two birds with one stone.

[Too Cold NB1.8T]

They are both plastic three way junctions that house a temp. sensor/switch and either one is pretty easy to R&R, the junction next to the head that you are speaking of, contains the Green temp. sensor, you will loose some coolant.

Make sure that you use -ONLY- VW/Audi G12 coolant, it is pure coolant so you will want to create a 50/50 mix with water (distilled water if you prefer), maintain your coolant level at the maximum line on the expansion tank with the engine idling and the expansion tank cao removed, let the engine idle for 20 minutes or so while watching for leaks, watching the coolant level and watching the dash and/or gauges for any problems.

Idling the engine with the expansion tank cap removed as noted above should purge the system of unwanted air, if your coolant warning light flashes during this process, don't be alarmed, the coolant you will have lost while replacing the broken part is not on the same side of the thermostat as the expansion tank.

Until the thermostat opens, this loss will not be replenished by the coolant you are adding so the coolant light in the dash might flash and beep for a short period of time, just keep monitoring everything until you are sure that all is well, then install the expansion tank cap and shut the engine off.

On a completely warmed up engine the coolant level should be at the maximum line on the expansion tank, check the level the following morning, with the engine completely cold the level should be centered between the maximum and minimum lines.

The information supplied is a combination of my own experience with this and the Bentley manual.

It is possible that the Crankcase Pressure Regulator could be causing some of youe problems but it's hard to say for sure, however I would definitely recommend replacing the cracked one.

[bobbittle]

Thanks for all the help!

[Too Cold NB1.8T]

Your very welcome and good luck...