hi all ,today when i was driving the car at about 70 mph suddenly i lost the power so i switched the car off and on and it was back to normal. when i came home i did the scan and found the following [ 17958 P1550 Charge Pressure Deviation intermittent ]what is it and how can i fix this ,any help will be greatly appreciate.thanks

This is what Ross-Tech's Wiki has to say about that fault code:

http://wiki.ross-tech.com/wiki/index.php/17958/P1550/005456

I'm getting the same code and have yet to get to the bottom of what is causing it. My car is also an SLX TDi, a 2000 reg with about 96k on it.

Mine's intermittent, and it's had the issue sinc I bought it in April. It's often fine for motorway driving but give it a particularly steep hill and accelerate and it may drop into limp mode. I've found I can replicate it 100% by booting it over the brow of a hill in 3rd accelerating up to motorway speeds. Spirited driving to high revs/load seems to temporarily improve it but is not a permanent solution (and it's never stopped it limping with the hill brow test).

Investigations so far haven't turned up anything conclusive. I suspect something is up with the turbo control or boost. This could be a solenoid, vacuum piping, boost leak, turbo vanes, control ring or actuator...

Tried swapping out a few things and checking the piping. Only thing found to date was a bad connection between piping and intercooler (not completely off though). That was put right but the limp issues have continued. I have read of two people on forums solving or working around it. One had an intercooler / piping connection issue. The other ran without the EGR solenoid plugged in. I've tried both and no joy.

Edit: Sorry - having to reschedule diagnostics.

Edited 19 July, 201114 yr by Uriel

Copied from another post of mine

Update on this:

Further diagnosis did reveal a definite sticking VNT issue. Realtime logging of requested boost indicated that it was a bit all over the place but mainly overboosting. Remedy was going to be turbo off and remanufacture or replace - plus I wasn't going to DIY it. Unfortunately the whole 'to do' list was longer (needed thermostat, wheel bearing, brake discs + pads replacing sooner rather than later). Tax was coming up (in the engine size rather than CO2 bracket so nearly double a 2001 car)and I had the offer of a long-term interest free car loan from a family member.

To cut a long story short, I'm no longer a Skoda Octavia owner. PXed for a 2010 Honda Insignt ES at the weekend.

Will copy this info into threads where discussion of the car's limp mode was active to bring a little closure. I guess I'll be a lot more scarce around these parts from now on.

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