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Can’t see a problem but just don’t turn ignition on

If your doing this at home soak it in white vinegar for a few hours

The 1.4 petrol is known for fuel rail issues. Not too much about the 1.0.

Yep I appreciate that, but if both sensors are working and picking up a fault between them then the natural assumption will get the cat. Hence why the car believes it's the cat. Feel free to change the other sensor and let us know the outcome.

You should have a sensor upstream and another downstream of your cat, ecu compares the readings between the 2 sensors. That’s how it works on most cars but not exactly sure what setup your car may have

So was my 2007 A3 diesel 2 litre, though rather long in the tooth now.

What's the source? Have you looked at buyers guides on YouTube? Worth a watch if not.

Thanks so much - this is really helpful 🙏

Interested to see how you go, mine hasn’t gone away. Just the same after their 2nd “inspection”. Good luck! The A3 is a lovely car apart from this though! I love mine..

That recharging the battery immediately allows the doors to lock strongly suggests that the battery is weak. If it is the original battery it undoubtedly needs to be renewed. Note that the ability of a battery to crank the engine is not an indication of it being in good condition,

Bit of an update picked my car up from the dealer today, basically they’ve done a full inspection and while they did hear some rubbing while moving the car and while on the lift they’ve put it down to brake disc rust. The courtesy A1 they gave me with only 45 miles on it had a slight rubbing noise when braking at slow speed, which could be down to pad materials, but quieter than what I’m experiencing at the moment. Their conclusion is that the brakes are fine, and the noise should go away after more use. So, I suppose I need to play the game a bit longer and go back when it’s still a problem in a month or so. As a side note, definitely made the right choice with the A3, the A1 felt very basic in comparison with a similar spec level, but still a nice little car, if not a bit pricey.

Hi, I’m still having the same noise, despite new front discs/pads. Audi said rust at first, which is not correct. I’ve now nearly done 2000 miles. They did keep mentioning the electronic brake booster will give a different “feel, but to me it’s not the feel but the sound. I’ve had both Audi and my independent say the brakes look ok, but it is strange, and annoying…and there are a lot of comments about this on many forums. Others have commented it’s the brake pad material, but I’m still not sure. Be interesting to hear what they come back with to you. I’m thinking to pop into some garages locally that say they specialise in Audi…maybe they’ve seen this before…

Newbie to the forum here. Picked up my A3 Sportback 35 TSFI 8Y facelift just over a week ago, and I’m experiencing the same grinding noise coming from the rear passenger side. It was ex-demo, six months old, but still only low mileage (2,500), its with Bristol Audi at the moment, but they are blaming rust too, which we've all experienced before, but having done 200 miles with some heavy motorway braking yesterday and still hearing the noise when arriving home I’m not convinced. Interesting others are having the same issue from the same wheel, at first I wondered if it might be part of the mild hybrid recuperation or the parking brake biting a little.

Apologies for the gripe, but the forum has recently suffered from a spate of what can be termed ‘Post and Run’ new members, who seem to think it’s perfectly acceptable to post a plea for help, and simply not return to view the help given. In a more diluted form, help is offered, but is very rarely acknowledged even via. a simple press of the Like button, leave alone a posted Thank You. The last part of the gripe is that we frequently have to ask for additional information, and this extra detail often never materialises. Please remember, everyone who posts replies do so without payment, but it certainly does cost them in time - in terms of the Moderators and Admin back up - a lot of time. So a special plea to all on here who post needing help:- please be respectful enough to acknowledge any help given, rather than simply accept it as a no-cost, no time of yours, free advice service. It’s wearing thin folks, so if you want to retain this service, please respect and acknowledge its benefits. Thank you all for reading this, and above all, agreeing to adhere to the respect that is needed to be shown. Kind regards, On behalf of the Moderators. Please note:- This request is to all members, not just new ones.

Unfortunately the devices they have started to use now doesn’t even require a key to be scanned, from what I’ve seen if the cars ecu’s are awake or awoken then the device can unlock the car almost instantly or within the alarm sounding once, when inside another device get puts into the obd port and starts the car. Different devices for different cars so if a local thief gets one then you will notice the same type of cars getting stolen, Range Rover, fiesta mk7.5 and fiat 500 seem the easiest so far, keyless ignitions almost always as ignition barrels slow them down

No Stephen, I live at the head of a road with just 4 houses on, it's nothing special but nobody can pass. I have gates and nobody can get closer than 10+ meters to read my key fobs and to do that, they would have to stand at my gates and read through walls from that 10+ meter disadvantage, ie they cannot stand near my outside walls. Situation was my car was unlocked when it happened, I had been out late with the mrs and was driving home craving a donner meat n chips, as we approached a road closed sign towards the takeaway, we had to u-turn, I clocked someone also u-turn behind me. I proceeded the next obvious route to my craving of kebab and even commented to my better half, somebody else is craving a kebab behind as I noticed we were followed from that point and at that moment, but my mind was on food and I was not concerned, my comment was as much in humour as it was an observation, I just thought their u-turn was due to the road closed ahead. I didn't see them after we approached or reached the takeaway shop as it was not a serious concideration when I initially made the comment, and if someone had have parked behind, it wouldn't have been abnormal as it is in the town center and we live less than 1 mile away. Went home and ate my kebab without further consideration. Our lass took the dogs on the grass/road for a wee and came back inside, a few mins later I was putting my rubbish in the kitchen bin and saw lights on my car through the window. I genuinly thought I had left ignition on, but when I went outside to turn it off, I noticed someone reversing it up the drive and another swinging on the gate. They were only young and half my size and fortunatelt had decided to scarper to which I was so grateful, I was not intending to confront anyone at the time, as I had only gone out to lock my car properly, it was a real surprise to see them. I had left it unlocked because we had dogs to get inside, there was a hedgehog on the path which I was told not to let the dogs near & and I was hungry like a cave man. We have good CCTV, when I looked back, this young kid walked up my road (80 meters) and over my 6' gates like it was a single door step, entered the unlocked drivers door and within 15 seconds had it started, he had a somthing small in his hand. They were experts. I am almost certain I was followed from prior to Donner shop rather than them scanning my key from a distance outside my house, mainly because I live in such a quiet road and people stand out a mile if hanging around. But it could have been the case I admit, and they could have scanned my key as I sat in the car waiting for the other half to collect the food. After being followed, they just needed me to leave the vehicle. I still have the footage. My keys are now kept in a secure unreadable location just in case non the less. The police officer that attended suggested the ultimate security was:- https://ghostinstallations.co.uk/ghost-immobiliser-installation-lp/?utm_source=google&utm_medium=ppc&utm_campaign=ghost-immobilisers-ep-north-prev-uk&utm_keyword=&gad_source=1&gclid=Cj0KCQiAy8K8BhCZARIsAKJ8sfSPhW0rvuUxpQ7wtvdbeD8WRwqe5-h64Ec1fgXZFUvNsO0tkVPS0QsaAimmEALw_wcB