A6 Engine Light - No Limp Mode

[ZEE-A6]

I have a 2015 Audi A6 2.0 TDI 190 Ultra (CNHA engine code).

Over a week ago I had the engine management light come on, but with no limp mode. I had started noticing a slight rattling noise when the engine is cold on idle in the morning however once warmed up there was no noise.

I had the car diagnosed by my local mechanic and the code was P200200 - Particulate filter, bank 1; malfunction
- Intermittent.

Now I know this has been covered a few times on various forums however the more I read the more confused I get on what this could be. We reset everything and the engine light went off for 2 days and then came back again, 3 days later the engine light went off and hasn’t come back yet.

The car now shakes on idle when cold however again no limp mode or loss of power from what I can feel anyway.

My guess after reading what I could regarding this engine code is the EGR valve and cooler need replacing however another forum was saying to replace the MAP sensor first, what is everyone’s thought on this?

Zee

[Steve Q]

It could be a sensor on the dpf. Alternatively you could try dpf cleaner or remove the dpf and clean it properly. If that fsiks then youll need to get a new dpf. 

[Envy]

Have you seen any glow plug warning light? Mine started flashing up the Glow Plug warning light intermittent and then an ECU warning that went away in its own time too. I took it to my local specialist who read the logged faults and a failing exhaust gas temperature sensor was identified. Seems to be a notorious point of failure and can effect regen cycles if left unfixed. Not surprising considering where the sensor head sits and what it is exposed to. The fault on mine is intermittent and have booked it in for replacement during next service at soonest possible date.

[Envy]

On 8/17/2021 at 4:15 PM, Envy said:

Have you seen any glow plug warning light? Mine started flashing up the Glow Plug warning light intermittent and then an ECU warning that went away in its own time too. I took it to my local specialist who read the logged faults and a failing exhaust gas temperature sensor was identified. Seems to be a notorious point of failure and can effect regen cycles if left unfixed. Not surprising considering where the sensor head sits and what it is exposed to. The fault on mine is intermittent and have booked it in for replacement during next service at soonest possible date.

So sensor has been replaced at a specialist with OEM type for the princely sum of £215. To go at 70K miles a little disappointing.

 

[Stevey Y]

4 hours ago, Envy said:

So sensor has been replaced at a specialist with OEM type for the princely sum of £215. To go at 70K miles a little disappointing.

 

Hi which sensor was replaced?, any way all sensors are prone to failure at some point there is no hard and fast rule as to the milage they should achieve I had to replace my oxygen sensor at 80k Audi recommend changing them at 110k but what it all boils down to is the question of how long is a piece of string.

Steve.

[Envy]

Sensor was the Pre DPF exhaust gas temperature sensor. 

[Stevey Y]

3 hours ago, Envy said:

Sensor was the Pre DPF exhaust gas temperature sensor. 

Hi well if you consider where that sensor lives it is not the most friendly of environments constant stratospheric temperatures just like my oxygen sensor therefore at five years and seventy thousand  its not done to badly.

Steve.

[Envy]

6 minutes ago, Stevey Y said:

Hi well if you consider where that sensor lives it is not the most friendly of environments constant stratospheric temperatures just like my oxygen sensor therefore at five years and seventy thousand  its not done to badly.

Steve.

Read my original post on this thread ^^^^

[Stevey Y]

On 9/7/2021 at 11:39 AM, Envy said:

Read my original post on this thread ^^^^

Hi can't quite understand what you are driving at the MAP measures the pressure differential between the air coming in reading supplied by the MAF sensor and what has actually arrived at the manifold the exhaust temp sensor lives next to the oxygen sensor and there is another one  after the cat.

Steve.

[Envy]

I did not comment on it being a MAP sensor fault. My issue (failing exhaust gas temp sensor) if left unchecked and left to fail more often / completely would have led to a loss of regen functionality that would in turn screw the DPF. No explicit dash warning to identify the sensor but a glow plug warning and momentary engine warning light were the trigger to get it investigated by a specialist that charged nothing for the diagnostic work. 

[ZEE-A6]

Right guys I apologise for not replying to this post for so long iv had so much going on and been out of the country for a while. 
 

it got to the point where my engine light went off all by itself but the rattle continued. Weird right? 
The rattle eventually got so bad that the guy was even shacking and vibrating and making the noise even while driving, the mechanic diagnosed it as the flywheel this time.
Changed the flywheel and that’s problem solved! Only issue now is that I have another engine light and I have the treaded transmission failure warning on my dash now 🤦🏼

Edited October 7, 2021 by ZEE-A6

[Stevey Y]

9 hours ago, ZEE-A6 said:

Right guys I apologise for not replying to this post for so long iv had so much going on and been out of the country for a while. 
 

it got to the point where my engine light went off all by itself but the rattle continued. Weird right? 
The rattle eventually got so bad that the guy was even shacking and vibrating and making the noise even while driving, the mechanic diagnosed it as the flywheel this time.
Changed the flywheel and that’s problem solved! Only issue now is that I have another engine light and I have the treaded transmission failure warning on my dash now 🤦🏼

Hi when was the transmission last serviced, could be the oil and filters are knackered, quite a common problem apparently.

Steve.

[ZEE-A6]

19 hours ago, Stevey Y said:

Hi when was the transmission last serviced, could be the oil and filters are knackered, quite a common problem apparently.

Steve.

I had the gearbox serviced by a specialist almost 30k miles ago and before me it’s been getting done regularly by Audi main dealers. 
 

The gearbox gets stuck in second, fourth and sixth it won’t go into any other gears. 
The engine management light is on and iv got the fault code P284D - Shift Fork ‘A’ Unrequested Movement.

Problem is where I live I don’t really know anyone who wants to touch this particular gearbox or who has the proper know how to pin point the problem.

A lot of places want to do a full gearbox rebuild and replace the mechatronic unit (tcm) but I believe the issue is purely in the mechatronic and it’s just going to be one of the motors that runs the gears. I know one motor is for first, third and fifth and the other is for second, fourth and sixth.

Not sure what to do or where to go now it’s just sat on my driveway.

Zee

[Stevey Y]

Hi, the recommended service interval is every 30k, there was a guy Don G who posted the same problem a few months ago and was advised that it might well be a mechatronics unit so he went for the cheaper option of a gearbox service, that cured it, BTW there are companies out there on the net that sell recon units and will also recon your own mechatronics unit on a three day turn round, there are a couple of drivers on my cab circuit that have Skodas with what is the same type of gearbox these have achieved over 200k without a rebuild so I seriously doubt you need a full rebuild as the mechanical parts of these gearboxes are very robust also google DSG gearbox specialists in your area and get a few informed opinions, you may even have to look a bit further to achieve what you require.

Steve.

[ZEE-A6]

20 hours ago, Stevey Y said:

Hi, the recommended service interval is every 30k, there was a guy Don G who posted the same problem a few months ago and was advised that it might well be a mechatronics unit so he went for the cheaper option of a gearbox service, that cured it, BTW there are companies out there on the net that sell recon units and will also recon your own mechatronics unit on a three day turn round, there are a couple of drivers on my cab circuit that have Skodas with what is the same type of gearbox these have achieved over 200k without a rebuild so I seriously doubt you need a full rebuild as the mechanical parts of these gearboxes are very robust also google DSG gearbox specialists in your area and get a few informed opinions, you may even have to look a bit further to achieve what you require.

Steve.

The issue I have is where do I begin with? Do I start by trying to give it a service? Ideally I would want to go to someone who knows their way around this particular gearbox as a lot of specialists try to steer clear of these

Zee

[Stevey Y]

3 hours ago, ZEE-A6 said:

The issue I have is where do I begin with? Do I start by trying to give it a service? Ideally I would want to go to someone who knows their way around this particular gearbox as a lot of specialists try to steer clear of these

Zee

Hi have a look on youtube thats where I go for a dummy run, if you are halfway decent with a spanner and have a good selection of tools it looks fairly simple just observe the correct torque settings when bolting it back together and any special tools you might need.

I helped my neighbour do an oil change on his TT Quattro's Haldex unit apparently they are supposed to be very difficult but he had bought an O.E. service kit, god they are cheap, and the filter removal spanner, I came away a bit underwhelmed, yes it was fiddly but the hardest bit was getting the filler plug in before the new oil spilled out, I aint as flexible as I used to be lol.

Steve.

[ZEE-A6]

Spoke to 2 specialists who deal with these gearboxes - JS Garage in Shipley have quoted £1800 for a gearbox rebuild which is surprisingly a very good price

Milta in Bristol who one of my friends absolutely swears by is quoting £2800 for a full rebuild, I told him what had happened and he said from what iv told him it sounds like a mechanical issue and will do a full strip down and rebuild but there was a slim chance it may be something else and could be cheaper but from what I told him he reckoned it was the full thing.

Decisions decisions 😂

[ZEE-A6]

Alright guys here’s an update since it’s been a while now… eventually gave the car to Milta in Bristol (great friendly guys by the way) 

They confirmed it was a mechanical fault and proceeded to fitting a reconditioned gearbox in my car which was ready within 3 days. Great!

Approximately 1-2 weeks later I started my car on one particular morning and the transmission malfunction warning came back on 🤦🏼 I turned the car off and started it again and everything seemed fine so I drove out of my drive and went onto the main road. When it got to a roundabout the car decided to lose all drive and the gearbox malfunction light came back on, it refused to move under its own power. I turned the car off but it refused to turn over this time and it would only turn ignition on (for radio or windows etc not fully started) if the car was in neutral while saying Select N or P. If the car was completely off only then could I move it into drive or park or reverse.. I waited for a friend to quickly come as I was causing traffic and we pushed the car off the roundabout which we nearly killed ourselves doing (so heavy!) and I called up milta who told me to get the car recovered back to them.

The following week I called up again and asked how it was doing and this time they confirmed the fault was electrical and that I could come down to collect. 
 

2 weeks down the line and now I am pretty sure it sometimes judders in second and when reversing without pressing the accelerator and only using the brake pedal I can here a clattering sound almost like a dmf sound.. milta are closed until 2nd January now so will give them a call then… starting to wish I had bought a manual now