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An ongoing case study of my personal DPF issues with my 2006 Audi A3 (and the reason this site was created!)
A general week for the car involves
- Short trip into town early morning (so cold air) of about 2 mile round trip
- A little bit later in the day it gets 5-6 miles to nursery and then to work
- Then another trip to nursery in the evening
- At least 1 day of the week, usually a weekend it gets taken out on a longish trip 20 miles+
- Every other week it gets a fair few motorway miles at the weekend
- 8th of September 2011 – Car purchased
- 3 weeks later – checked at garage (no faults)
- Start of October – Juddery Idle + Diagnostic at VAG specialist
- Mid October - DPF light on
- End of November – Shaking on Idle
- End of November – Took for Service at VW
- End of November - DPF + Coil light on (VW replaced a sensor, asked us to alter driving style.. which we did)
- December 1st – Passive Regeneration (no lights, but high revs)
- December 7th - Passive Regeneration (no lights, but high revs)
- December 13th - Passive Regeneration (no lights, but high revs) (even though a 1 hour 45 min round trip on 9th)
- December 13th (Afternoon) – DPF light on
- December 14th, – Unable to clear DPF light.. back to VW to ask why even with changed driving style this has happened again. Now told must drive on motorway almost daily if you own a DPF diesel. VW mechanic told us it will need replacing at 100k and advised (off the record) to have it removed
- December 16th - Passive Regeneration (no lights, but high revs)
- December 17th – DPF Light on
- December 18th – Cleared the DPF light with a 15 min drive on motorway in 5th
- December 20th – Booked in at Audi for software update (related to Injector recall)
- December 20th – 4 new injectors FOC courtesy of Audi
- December 20th - DPF Light on
- December 21st – Cleared DPF Light
- December 22nd – Booked in for DPF removal (at last!)
- December 22nd – Car up on ramp at Found that the DPF fitted to my car was welded on from another make/model… badly!
- December 22nd – Miltek DPF delete pipe fitted due to not being able to just remove the DPF internals due to dodgy welding work.
- All problems now solved thanks to Shark Performance Tuning who i would recommend to anyone looking for Audi DPF removal
Purchased the Audi A3 from Euro Motor Co in Rotherham on the 8th of September 2011.
Took it back to them about 3 weeks later to investigate a “juddery idle” that shook the car side to side slightly. They were unable to find any faults after having the car for 2 days and the car ran fine when i got it back.
The juddery idle returned a few weeks later, so i took the car to a local VAG specialist at the start of October to get a diagnostic check and the central locking function altered. Everything came back fine and they suspected the flywheel to be the cause of the juddering.
Sometime around mid October the car was often “shaking on idle”, eventually after a week or so the DPF light came on (for the first time) and after a blast up a dual carriageway for 25 mins or so the light went out. After that the car was idling smooth and appeared to be running a lot better than it had for a while. By this point i am starting to link the shaking on idle with a DPF blockage.
Towards the end of November the shaking on idle had returned and also the car was often idling at 1k rather than just above 800 rpm as it should, which is an indication of a passive DPF regeneration cycle.
The car was due a service so i figured they might spot if anything wasn’t quite right. A new rear wiper motor, break fluid change and a service later i got the car back. Next day DPF light was back on, not a problem i thought so took it for a long spin to clear. I tried with some VERY hard driving but nothing would get the light to go out.
As usual with these things it was weekend so i set off to take the car to the garage on Monday via the petrol station, as soon as i left the petrol station the coil light also appeared which means the DPF is blocked to a point where it can’t regenerate itself and advises you to go to the dealers.
The dealership ran some diagnostics and confirmed the DPF was blocked and one of the sensors was also blocked. So on approximately November 25th the sensor was replaced (at a cost of £150) and the DPF “regenerated” apparently. The car was then driven over to Manchester and back (about 2 hours each way) on the return trip the DPF light came on again but went off after approx 10 mins.
December the 1st the car did its first passive regeneration, increased revs, louder turbo noise. I took the car for a spin as instructed by the dealership until the revs went back down, probably took 15-20 mins.
December 7th passive regeneration AGAIN, 20 mins to clear.
I’ll continue this case study as the year progresses, although i feel it may end with a DPF removal, time will tell.