Several dash lights

[danwheatley]

Hi all, first post here.

I’m experiencing some issues with my 2014 C7, several lights have come onto the dash within 24 hours of each other.

Engine management light
Glow plug light (flashing)
DPF light
Stop/start function unavailable

I’ve changed the MAF sensor & had the codes reset but so far no luck. (Done by a mechanic as I don’t have a reader at present)

My car has done 45,000 miles, is due a service which I am due to get around to, however I’m wondering what I could do to resolve the problem.
May be worth noting that my mechanic said the reader shows that it isn’t giving a correct reading on the air flow (???)
The car has not lost power whatsoever.
Last night I tried to initiate a DPF regen by driving for around half an hour at 2.5/3k revs doing about 60/65 but it doesn’t seem to have done anything.
On a side note, the battery died one month ago when I was on a roadtrip down to Paris (Mrs turned the ignition on to charge her phone and put the heating on whilst I was asleep and fell asleep herself, then woke up a few hours later to find the “Charge battery” display message) - I’ve had no issues up until now with anything.

If anyone could recommend a solution it would be greatly appreciated. I’m beginning to think it may be a battery issue due to the start/stop problem, and all of the other systems not working correctly due to the battery being low. I am due to get the battery tested today and see where we are at.

Thanks a lot 😄

[johnsimcox]

Hi all, first post here.

I’m experiencing some issues with my 2014 C7, several lights have come onto the dash within 24 hours of each other.

Engine management light
Glow plug light (flashing)
DPF light
Stop/start function unavailable

I’ve changed the MAF sensor & had the codes reset but so far no luck. (Done by a mechanic as I don’t have a reader at present)

My car has done 45,000 miles, is due a service which I am due to get around to, however I’m wondering what I could do to resolve the problem.
May be worth noting that my mechanic said the reader shows that it isn’t giving a correct reading on the air flow (???)
The car has not lost power whatsoever.
Last night I tried to initiate a DPF regen by driving for around half an hour at 2.5/3k revs doing about 60/65 but it doesn’t seem to have done anything.
On a side note, the battery died one month ago when I was on a roadtrip down to Paris (Mrs turned the ignition on to charge her phone and put the heating on whilst I was asleep and fell asleep herself, then woke up a few hours later to find the “Charge battery” display message) - I’ve had no issues up until now with anything.

If anyone could recommend a solution it would be greatly appreciated. I’m beginning to think it may be a battery issue due to the start/stop problem, and all of the other systems not working correctly due to the battery being low. I am due to get the battery tested today and see where we are at.

Thanks a lot 
Almost certainly a battery issue. The A6 is very sensitive to the health of the battery and if the car detects anything other than a perfect battery it startas throwing random warnings. With the car being over 5 years old and presumably still on its first battery I would change that first before sp[ending more money on other things. If you dp a like for like swap then should not need to recode the car for the new battery, if it is slgihtly differnet you may need to code the battery tot he car but it counds like you have access via your mechaninc to VCDS so that should be faily straightforward

[danwheatley]

Almost certainly a battery issue. The A6 is very sensitive to the health of the battery and if the car detects anything other than a perfect battery it startas throwing random warnings. With the car being over 5 years old and presumably still on its first battery I would change that first before sp[ending more money on other things. If you dp a like for like swap then should not need to recode the car for the new battery, if it is slgihtly differnet you may need to code the battery tot he car but it counds like you have access via your mechaninc to VCDS so that should be faily straightforward

Thanks for your reply John.

I’m nipping down to Halfords in an hour for a free battery check as my mechanic can’t fit me in today. Anything I should be looking out for i.e. low voltage etc? Just so I know they aren’t trying to fleece me 😂

[johnsimcox]

Thanks for your reply John.

I’m nipping down to Halfords in an hour for a free battery check as my mechanic can’t fit me in today. Anything I should be looking out for i.e. low voltage etc? Just so I know they aren’t trying to fleece me 
I think anything much below 12v will cause an issue. I believe a healthy battery should be around 13v but I may be wrong. If you change the battery at Halfords, make sure that what they sell you is indeed compatible with your car. Not all batteries are the same!

[danwheatley]

I think anything much below 12v will cause an issue. I believe a healthy battery should be around 13v but I may be wrong. If you change the battery at Halfords, make sure that what they sell you is indeed compatible with your car. Not all batteries are the same!

Well I’ve had the battery tested and it’s at 12.65V, they said no problems with it at all.

I’m now at a loose end!!!! 😩

[Elansear]

Look at this thread, he had 12.6 v and it was causing problems, think a new one may resolve yours hopefully.
Thread: Cruise control / Start-stop system issue (http://www.vwaudiforum.co.uk/forum/showthread.php/showthread.php/193469-Cruise-control-Start-stop-system-issue)

[danwheatley]

Look at this thread, he had 12.6 v and it was causing problems, think a new one may resolve yours hopefully.
Thread: Cruise control / Start-stop system issue (http://www.vwaudiforum.co.uk/forum/showthread.php/showthread.php/193469-Cruise-control-Start-stop-system-issue)

Possibly will get the battery replaced but really did not want to spend money unnecessarily.

Since my last post, my Carista scanner arrived and I’ve scanned the car.

Faults:
P0104 Mass or Volume Air Flow “A” Circuit Intermittent
10065 Intermittent or Erratic Fault Detected in the MAF sensor or circuit.

[Elansear]

My good old TT gave me Maf fault codes when it was messing around with loss of boost, problem was actually the N75 valve that controls boost. Lesson learned, it's not allways what is reported that is the real issue. Hope you get it sorted.

[danwheatley]

My good old TT gave me Maf fault codes when it was messing around with loss of boost, problem was actually the N75 valve that controls boost. Lesson learned, it's not allways what is reported that is the real issue. Hope you get it sorted.

Yeah I understand, I’ll probably look at changing the battery if no one else knows anything more. Cheapest I found was £200 though [emoji30]


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[OmegaV6]

Before changing the battery why not put it on charge for 24 hours?? Make sure it is really fully charged then see what happens ?? A decent modern charger has "repair" options which can, sometimes, sort out battery problems. Worth a try IMHO :)

[danwheatley]

Before changing the battery why not put it on charge for 24 hours?? Make sure it is really fully charged then see what happens ?? A decent modern charger has "repair" options which can, sometimes, sort out battery problems. Worth a try IMHO :)

It’s a great thought, don’t get me wrong I would do, but I have 3 jobs (Yes three) so it’s impossible for me to not have my car that long, I’m not able to get other transport due to location/cost . I know it’s going to be costly for a new battery so I’m looking at other less costly options if they are possible. Doesn’t seem like anyone has experienced the exact same issue as me so it’s difficult [emoji30]


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[dean warren]

Any idea what faults were showing? I dont think your dpf will regen if faults are logged in the engine ecu


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[OmegaV6]

It’s a great thought, don’t get me wrong I would do, but I have 3 jobs (Yes three) so it’s impossible for me to not have my car that long, I’m not able to get other transport due to location/cost . I know it’s going to be costly for a new battery so I’m looking at other less costly options if they are possible. Doesn’t seem like anyone has experienced the exact same issue as me so it’s difficult [emoji30]


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mmm OK ... do you have access to a digital voltmeter ?? if so check the voltage at the battery before you start in the morning (1), then again, with the engine still running after you've driven for at least an hour (2). Then again after the engine has been turned off for about an hour. (3) If the battery is in decent shape you should see figures of around (1) 12.7 (2) 13.8 (3) 12.7 If you see numbers like (1) 12.5 or less (2) 14.4 (3) less than 12.7 then it is likely the battery is FUBAR..... very "quick and dirty" checks that are not the normal way of checking batteries, but might give an indication of the problem .......

[VAG-Abound]

As above, if still on first battery and it has been abused a bit well worth changing to avoid dead eñ searches for other causes and an unfourtunate incidend where it won't start one morning.

I've found tanya.co.uk to be well priced and efficient for delivery.

[danwheatley]

Any idea what faults were showing? I dont think your dpf will regen if faults are logged in the engine ecu


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I listed the faults in a comment above, can’t copy and paste for some reason.

I did clear the faults but they came back sharpish


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[danwheatley]

As above, if still on first battery and it has been abused a bit well worth changing to avoid dead eñ searches for other causes and an unfourtunate incidend where it won't start one morning.

I've found tanya.co.uk to be well priced and efficient for delivery.

I’ll check them out, thankyou


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[danwheatley]

Car now in limp mode!

Haven’t had chance to look at batteries yet....


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[danwheatley]

After scanning the car with it going into limp mode, new codes. I’ve attached the photo hopefully you can view.

But it’s now got DPF restriction - soot accumulation on OBD2/engine :(


https://uploads.tapatalk-cdn.com/20200206/c9823f0df4a350349f695ddbc9819aec.jpg




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[Whippy53]

Looks like the mass air flow sensor This P0104 diagnostic trouble code (DTC) means that there is an intermittent or erratic fault detected in the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not performing within the normal expected range of the calculated MAF value.

[danwheatley]

Car has been in for 2 days now still no luck [emoji30]

Tired of waiting.....


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