Hi there guys i posted a topic there a few days ago on whether i should consider moving on my 1.9TDI for something with more power. Ironically, everyone said i was mad because the TDI is bulletproof and now it has let me down, haha. It is still a very reliable engine dont get me wrong i know that, but it has failed me right now. I was driving to go hiking yesterday, and i was going up a hill. I felt a sudden drop in response from the gas pedal i knew something was wrong. The car had lost half its power and It had clearly gone into limp mode. The  engine was louder than before, and i could smell a faint smell of something, which could have been oil or soot, not entirely sure. So when i got home i scanned it with VCDS and got the following code.  From research online this can simply be a bad connection between the ECM and the n75 or the connection on the solenoid is bad, or the solenoid is bad in general. Or it could be a bad turbo which is a really bad state of affairs i suppose. Possibly sticking vanes. Feel free to correct me!  I think i will just get a new N75 solenoid anyway and see if it fixes it. Only around 60 quid from main dealer. Just wondering if if anyone has any advice on this and how big a job is it to replace the n75 solenoid ? Cheers Hugh

 

000581 - Solenoid Valve  for Boost Pressure Control (N75) 
               P0245 - 000 - Short to Ground - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 239064 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 1659 /min
                    Speed: 59.0 km/h
                    Load: 60.8 %
                    Voltage: 14.44 V
                    Bin. Bits: 00101000
                    Absolute Pres.: 1907.4 mbar
                    Absolute Pres.: 2050.2 mbar

 

Now this is it ironic, after what I said 🤦‍♂️ I think the car knew you were looking to get rid of it so it's playing up now lol. 

Has the issue happened just once? 

If so, I'd record the codes but then clear them and see if they come back. 

For reference a turbo will cost around £600 I think. If it is the turbo, do t buy one of those cheap Chinese ones as they're often known to fail just outside of the 1 year warranty. 

As you were after more power anyway, now could be the time to get a hybrid turbo, front mounted intercooler and a remap. 

After all you did say you wanted to keep the call long term. 

I know Steve, it's funny but not at the same time 😑, yeah i already have cleared the code and then took for a quick drive came straight back same code. It's only that code i have on the engine bar two, which is related to the engine mount and AC controller. Maybe i should view it as i good thing and get a hybrid. But yeah will be very annoyed if its the turbo. I swear this car can smell when i get paid...

 

005512 - Engine Mount Solenoid Valves (N144/N145) 

 

5697 - Please check DTC Memory of A/C Controller 
               P1641 - 000 - 

Is the battery in good shape? A dying battery can lead to limp mode and give false error codes.

Hey there I just got a new battery like a month ago. That was because the other one got drained. Suppose it's plausible I have drain somewhere

 

EDIT. Checked My battery there has one of those health check indicators on it. It's still green, so i doubt it's that. 

Edited January 19Jan 19 by _hugho_

Further investigation required then and you'll need to decide what route you take.  

Well Guys ! I have good news i suppose, will take a new MAF Sensor to completely know for sure. But as described on linked forum https://forums.tdiclub.com/index.php?threads/diagnosing-and-fixing-limp-mode-for-a4-1-9tdi-low-power-troubleshooting.179589/ First port of call to diagnose a TDI in limp mode it to unplug the MAF and see if power is restored. Lord behold it worked. Car was out of Limp mode. I cleared the Engine code and of course i now had a MAF code but n75 no boost code was gone. So i have ordered a New MAF and hopefully that sorts out my issue ! Thanks for help anyway on all this. Will Keep you updated on whether new MAF sorts everything out. Hugh