Afternoon all

 

Wondered if anyone else has experienced this with a 150 TDI ?

 

(Car will be going into dealer, I'm just interested to hear if this has happened to anyone else and if so, what the cause was.)

 

Car is a 65 plate Superb 150 TDI SEL Exec 4x4 manual on 23k miles, and is completely standard.

 

Coming up the steep hill back to our village yesterday, warning lights on dash and car went into limp mode.

Skoda assistance came out (within 12 minutes of phonecall !!), ran through some tests and found boost pressure not quite as specified. He also did a visual check of the inlet impeller (OK) and vacuum tests (presumably to the turbo actuator) which was fine. No obvious sounds of boost leaks.

His suspicion is a turbo fault.

 

Extract of fault scan below....

 

3 Faults Found:
19225 - Boost Pressure Regulation 
          P0299 00 [101] - Control Range Not Reached
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 38127 km
                    Date: 2018.05.28
                    Time: 15:03:25

                    Engine speed: 1715.00 /min
                    Normed load value: 100.0 %
                    Vehicle speed: 61 km/h
                    Coolant temperature: 95 °C
                    Intake air temperature: 114 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 12.960 V
                    Unlearning counter according OBD: 40
                    Charge air pressure specified value: 2322 hPa
                    Charge air cooler inlet: pressure sensor 1 bank 1: raw value: 1866.4 hPa
                    Mass airflow sensor 1 bank 1 airflow: raw value: 665.1 mg/stroke
                    Exhaust recirc.valve 1 bank 1: posit.feedback - Act.value: 17.70 %
                    Throttl.valve adapt. 1 bank 1: posit feedback - Act.value: 0.06 %
                    Turbine actuator 1 bank 1: posit.feedback - Act.value: 95.26 %
                    Mean injection quantity: 49.08 mg/stroke

25710 - Boost Pressure Regulation 
          P0299 00 [101] - Control Range Not Reached
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 38127 km
                    Date: 2018.05.28
                    Time: 15:03:25

                    Engine speed: 1715.00 /min
                    Normed load value: 100.0 %
                    Vehicle speed: 61 km/h
                    Coolant temperature: 95 °C
                    Intake air temperature: 114 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 12.960 V
                    Unlearning counter according OBD: 40
                    Charge air pressure specified value: 2322 hPa
                    Charge air cooler inlet: pressure sensor 1 bank 1: raw value: 1865.8 hPa
                    Mass airflow sensor 1 bank 1 airflow: raw value: 669.5 mg/stroke
                    Exhaust recirc.valve 1 bank 1: posit.feedback - Act.value: 17.70 %
                    Throttl.valve adapt. 1 bank 1: posit feedback - Act.value: 0.06 %
                    Turbine actuator 1 bank 1: posit.feedback - Act.value: 95.26 %
                    Mean injection quantity: 49.14 mg/stroke

 

Did he check all hoses/pipes?  

 

I think the P0299 is a PITA to diagnose, have a quick google and you'll see it's hit quite often.  So things to check would likely be diverter valve, PCV valve  and MAF sensor, turbo actuator, EGR sensor etc.  I think the best thing though would be to check all the hoses are 100% sealed and there's no cracks, leaks or disconnections. 

 

With it being a '65 plate car I would assume you're still in your warranty period by a good couple of months?  

Yeah all covered by warranty. Just interested to know if the problem has been seen elsewhere

I had something similar a few years ago on my 53-Plate Audi A6.  Now I didn't use fault code readers etc, but it turned out to be a Turbo hose split, and only showing once the engine was under load.  There was a hissing noise (like turbo but louder) under load, just before it flicked over to limp mode.  Happened a couple of times accelerating on the Motorway, quite scary!

 

The more annoying thing was the hose was a "special fitting" and could only come from an Audi main dealer at a cost of over £200! When normal turbo hoses are cheap at about £12!  Even my mechanic balked at it!

We had this on an Octavia - mouse had eaten some of the rubber tubes behind the engine - not warranty.

 

We were in the Alps at the time, no charge by the dealer as they had seen it before and was 5 minutes to diagnose and fix, took longer to explain!

5 hours ago, IJWS15 said:

We had this on an Octavia - mouse had eaten some of the rubber tubes behind the engine - not warranty.

 

We were in the Alps at the time, no charge by the dealer as they had seen it before and was 5 minutes to diagnose and fix, took longer to explain!

The Skoda assist chap did mention that wasn't uncommon. Apparently the hoses use some soya-based rubber now ? Which seems more attractive to rodents...

 

However he had a good look at the vac pipes he could get to, and also did a vacuum test (presumably on the turbo actuator) which were OK.

 

Since we had the car (from new) I've always thought our MPG was low compared to what others have been getting (rarely see 50mpg even on a long cruise, it's usually high 40s according to computer), and I've also thought the throttle response wasn't as good as it could be - like a bit laggy, requiring more accelerator travel to make it get up and go. But never any faults until now.

I'm now wondering if there's always been something slightly amiss.

 

Probably won't know for a few days as the dealer workshop is fully booked until middle of next week.

Edited 30 May, 20188 yr by muddyboots

12 minutes ago, muddyboots said:

The Skoda assist chap did mention that wasn't uncommon. Apparently the hoses use some soya-based rubber now ? Which seems more attractive to rodents...

 

However he had a good look at the vac pipes he could get to, and also did a vacuum test (presumably on the turbo actuator) which were OK.

 

Since we had the car (from new) I've always thought our MPG was low compared to what others have been getting (rarely see 50mpg even on a long cruise, it's usually high 40s according to computer), and I've also thought the throttle response wasn't as good as it could be - like a bit laggy, requiring more accelerator travel to make it get up and go. But never any faults until now.

I'm now wondering if there's always been something slightly amiss.

 

Probably won't know for a few days as the dealer workshop is fully booked until middle of next week.

Throttle response has always been a bit laggy since drive by wire became the norm.  It's commonly reported gripe on here and most 'solve' the problem with a pedal box which intercepts and spoofs the signals from the throttle pedal angle/position sensor; so when you're applying 10% of throttle the box will apply witchcraft and tell the ECU you're actually pushing it in 30%.   They do work.  I think it's a characteristic of the system itself, rather than a consequence of the the other issues you're having. 

 

 

3 minutes ago, penguin17 said:

Throttle response has always been a bit laggy since drive by wire became the norm.  It's commonly reported gripe on here and most 'solve' the problem with a pedal box which intercepts and spoofs the signals from the throttle pedal angle/position sensor; so when you're applying 10% of throttle the box will apply witchcraft and tell the ECU you're actually pushing it in 30%.   They do work.  I think it's a characteristic of the system itself, rather than a consequence of the the other issues you're having. 

 

 

 

So why not press the throttle a bit harder? Same result and costs nothing.

8 minutes ago, skidpan said:

 

So why not press the throttle a bit harder? Same result and costs nothing.

Actually no, not the same result at all.  

 

The units significantly increase the response times which the signals are interpreted, spoofed and then sent on to the ECU over the stock pedal 'map'.  You'd likely need to floor the pedal as quickly as you could to even get close.  

On 30/05/2018 at 13:37, penguin17 said:

Throttle response has always been a bit laggy since drive by wire became the norm.  It's commonly reported gripe on here and most 'solve' the problem with a pedal box which intercepts and spoofs the signals from the throttle pedal angle/position sensor; so when you're applying 10% of throttle the box will apply witchcraft and tell the ECU you're actually pushing it in 30%.   They do work.  I think it's a characteristic of the system itself, rather than a consequence of the the other issues you're having. 

 

 

I think it's deliberately made laggy for emissions/economy or other reasons.  I had an Alfa 156 V6 and that had drive by wire throttle 20 years ago.  That was instant response.  (drank petrol like it was going out of fashion though).

Well, dealer ran through guided tests for underboost faults, no faults found....did some extended road tests after checking what conditions the fault occurred in - and it's behaving perfectly, as it did on the longish drive home.

 

So - none the wiser !

 

 

Carbon build up and vnt blades sticking open?

 

used to happen, more usually stuck for over boosting on the pd140.

Edited 14 June, 20188 yr by cheezemonkhai

From @Vladimirm - Reported instead of posted.

Regards, how did you solve the problem? thanks.

On 31/05/2018 at 22:56, dg360 said:

I think it's deliberately made laggy for emissions/economy or other reasons.  I had an Alfa 156 V6 and that had drive by wire throttle 20 years ago.  That was instant response.  (drank petrol like it was going out of fashion though).

I had one of those...........2,5 V6..........the engine was a work of art.

On 19/06/2019 at 07:15, john999boy said:

From @Vladimirm - Reported instead of posted.

Regards, how did you solve the problem? thanks.

The dealer never managed to replicate the problem, and it's never happened again since...so nothing was done.

5 hours ago, muddyboots said:

The dealer never managed to replicate the problem, and it's never happened again since...so nothing was done.

Under warranty? Were you charged if no fault found?

Asking as I think I have similar.

On 20/06/2019 at 19:46, Baggins said:

Under warranty? Were you charged if no fault found?

Asking as I think I have similar.

All investigated under warranty, no charge.