Power Loss / Turbo loss on VW Passat 1.9TDI

**mubsy812001** · 04-05-2009,11:53 AM

All,

I truely appreciate the fact that you guys are helping me out on this. I have now eventually found a mechanics guy in bolton who does a diagnostic check, car is due to go in tomorrow.

Now there appears to be another problem!

As soon as I switch the car on the orange coil light goes on and flashes and it says "engine Workshop" on the dash!

Is this something serious? I am really worried now as I have the turbo problem and now this engine worksop thingy with the coil light flashing. I am worried this is going to cost some money now!

Please can someone shed some light on this pls

Regards

**martin1810** · 04-05-2009,12:04 PM

It's just telling you that it has logged fault codes that need reading. It doesn't mean they are serious, just that you should get them investigated.

**martin1810** · 04-05-2009,12:18 PM

Mubsy... Once you have a code read, You will get advice that is more relevant. Too much guessing is pointless as Crasher says. People often spend lots of money replacing parts to avoid paying for a code read. This is usually false economy.

**Crasher** · 04-05-2009,12:29 PM

Mubsy, I would not be surprised if all your problems were just due to a cheap and easy to replace brake light switch fault.

**boidy** · 05-05-2009,02:34 AM

how could a brake light switch cause this problem crasher ?

**mubsy812001** · 05-05-2009,09:11 AM

The drivers side brake light was not working (I didn't realise) so bulb was replaced and the Coil light no longer flashing and the "engine Workshop" message no longer coming.

The problem of turbo not kicking in still there, will go and do the diagnostic today and let you guys know what happens. Is there something specific the diagnostic chap needs to do whilst he doing the diagnostic check, as I have read somewhere that you get a rod and poke an area of the car whilst doing the diagnostic and it will solve some problem??

**Crasher** · 05-05-2009,09:22 AM

If you use the sites search facility you can read about 10,000 posts regarding brake light switches. The switch is a dual purpose unit. There are two contacts; one feeds the brake lights and the engine ECU and the other only the engine ECU as a double check. The system is known as Electronic Performance Control (EPC) and the brake light switch is part of the safety system and the code is likely to be “00741 Brake pedal monitoring Implausible signal” or “16955 Brake light switch F Implausible signal” and these will make the glow plug light flash and can cause the engine to lose power. Maybe the new bulb will have cured it, it can cause the same code. The part that is “poked” as you put it is the turbo vane actuator but this should only be encouraged to move whilst in Basic Settings 04, Main group 011 with the status in Block 2 showing “ON”.

**mubsy812001** · 09-05-2009,11:43 AM

Hi Crasher,

Just done a diagnostic on the car the following codes showed up:

17965 - P1557 Turbo/super charger overboost, Condition: control limit exceeded

16955 - P0571 Brake switch (a) Sporadic:Circuit Malfunction

He didn't understand how to do the poking and he didn't understand how to change the diagnostic machine in different modes.

I need to know pictorially what to do now as I plan on doing the work myself and am a complete novice with cars in order to save money! can you show me with pictures (as done in your previous post) what I need to do to solve my rpoblem.

Help much appreciated.

Regards