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Discussion Starter #1
Hey All - my emission control system light has come on and stayed static for approx 15 miles. I have a 2013 Q3 and it's done 50k miles. Just wondering if anyone knows if it is still OK to drive the car normally whilst this light is on? I've just been to Audi and they can't get to look at it until next week and I need to use the car every day until then. What does the warning light even mean? I know it needs a diagnostic check to find out for certain, but in general? Also wondering if an independent garage might be able to fix it, for cheaper than Audi direct? Any help appreciated please. Thanks.
 

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I think that might be throttle body control valve not operating properly, inlet ports flaps not operating properly, or EGR valve not operating properly. All usually related to particulate/carbon/soot build up inside the air ducts which is chiefly a consequence of exhaust gas recirculation.

Should that be the case an independent garage could quickly identify and solve the problem for a far lesser price than an Audi Service.
 

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Definitely go to an Indie VAG specialist. You don't say whether it's petrol or diesel which means it could be a lot of things. However, it's unlikely any of them will suddenly strand you but regardless it needs diagnosing fairly sharpish. If it's a petrol variant, does the engine idle a tad faster and unevenly since the light came on? If so, it's a fairly simple fix - to do with a breather valve needing replacement, a fairly common occurrence. Replacing the valve doesn't take long and it's not a bank-breaker either.


I do stress, however, that it could be any one of several different things and the sooner it's diagnosed the better.
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Is it diesel?
If so best IMO would be to have vcds connected and fault code discovered. If it’s regarded to the emission component( i.e EGR) I would claim it as “emission fix” sourced problem to Audi.

Had the same story - EGR clogged - claimed to Audi and they have replaced EGR free of charge - see my EGR topic...

Another problem might be clogged DPF that requires to be burned out - that can be done with vcds too - either during driving or stationary if soot level is higher.
 

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Yet again, it could be Dirty Fuel.
 

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Won't this be covered by the 2 year Audi warranty following the emission fix.
 

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Discussion Starter #7 (Edited)
Hi All - sorry, I didn't update you all on this. So an independent mechanic diagnosed that one of the lambda sensors needed replacing - which he did, and this fixed the problem. It has been fine ever since - but this morning the emissions warning light has returned. If a new lambda sensor had been replaced, why would this problem return? Does anyone have any ideas?? The car is a diesel. Thanks.
 

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Hi All - sorry, I didn't update you all on this. So an independent mechanic diagnosed that one of the lambda sensors needed replacing - which he did, and this fixed the problem. It has been fine ever since - but this morning the emissions warning light has returned. If a new lambda sensor had been replaced, why would this problem return? Does anyone have any ideas?? The car is a diesel. Thanks.
Hi, I'm not sure exactly what your problem is.. However, if you have the 2.0 tdi engine. The following links may help or be of some interest to you. I can also I have had the DPF light coming on. Had it reset. And it came on again. Before having it reset again. I followed what is explained in the links. And used Redex, as per the instructions. On the bottle. I tried two bottles. Then got the DPF reset. My car was under the dealers warranty. Since this (over a year ago) I have not had any problem.

The first link is the procedure I followed. The second ling will also probably be useful. If it is your DPF. Which I assume it s most likely to be. The little Orange engine light coming on . I ll see if I have a photo of it. Let me know how this helps. Good luck!




https://www.youtube.com/results?search_query=audi+q3+dpf+regeneration
 

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If the vehicle has had the free Audi emission fix then the cost will be covered by the Audi 2 year warranty.
 

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Discussion Starter #10
Hi All - another update on this issue. As some people said the lightay go out on its own, I decided to leave it in the hope that it would. Two days lTer the light was still on but I had to fill up with diesel. I put a full tank in and the emissions control light immediately went out after filling up. It has stayed out ever since, until this morning when it has returned - and I'm due to fill up on diesel over the next couple of days. Totally intrigued if the light goes out again when I fill up. If it does, perhaps the emissions control warning light come on when. I my tank reaches a certain low level...if so, does anyone think I should still get this checked out, or is it a harmless annoyance? Thanks All.
 

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Since Diesel has no misfire problems I think you're pretty safe as long as the car is drivable. But you could still incur into limp mode and not knowing what it is doesn't help to mitigate the problem if that's what you're after.

Definitely have the issue diagnosed. A simple scan tool costs far less than any workshop intervention and is always a good idea to have at hand.
 

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Since Diesel has no misfire problems I think you're pretty safe as long as the car is drivable. But you could still incur into limp mode and not knowing what it is doesn't help to mitigate the problem if that's what you're after.

Definitely have the issue diagnosed. A simple scan tool costs far less than any workshop intervention and is always a good idea to have at hand.
Hi have an emission control light on wit
Hey All - my emission control system light has come on and stayed static for approx 15 miles. I have a 2013 Q3 and it's done 50k miles. Just wondering if anyone knows if it is still OK to drive the car normally whilst this light is on? I've just been to Audi and they can't get to look at it until next week and I need to use the car every day until then. What does the warning light even mean? I know it needs a diagnostic check to find out for certain, but in general? Also wondering if an independent garage might be able to fix it, for cheaper than Audi direct? Any help appreciated please. Thanks.
 

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Hi - have the emission control light on problem with my 65 plate 55K miles Audi Q3 SE 2.0TDI - during a routine service this week at an approved Audi independent I had them run a diagnostics check which indicated a fault with the glow plugs. Car is OK to run but they recommended changing glow plugs sooner rather than later.
 
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