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I have an audi a4 diesel engine code afn and when left overnight i have problems starting the car, it has had new filters a new air flow meter and sensors and even with plenty of heat still struggles to start when started it smokes quite badly for a coulpe of seconds, any ideas?? Thanks

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Probebly a sticky injector, try putting a bottle of injector clean through the system, if not it could be burning oil.

Posted on Nov 27, 2010


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2005 a4 while driving lose acceleration and power

Would really need more details on the vehicle. Petrol / diesel etc

Is the engine management light on? Are there any fault codes?

Power lose while driving is most likely to be caused by the mass air flow meter, leak at a vacuum or intake hose, turbo leak etc.

More details please........

Apr 02, 2014 | 2005 Audi A4

1 Answer

Audi a4 tdi 2002 smoke and idle problem

The battery in a 2002 Audi A4 is located at the rear of the engine compartment (back near the windshield) & has a tie down requiring a 6mm Allen wrench to remove it.----------------------------------------------------------------------------------------
auto HID Xenon light

Jan 15, 2013 | Cars & Trucks

1 Answer

How do you Change timing belt audi diesel engine code AFN?

Timing belt diagram for Audi A4 1.9 TDI, engine code AFN


Dec 01, 2010 | Audi AllRoad Cars & Trucks

1 Answer

All meters in dashboard dont work

Loose connector at back of dash.

Mar 12, 2010 | 2000 Audi A4

1 Answer

Car works fine untill left overnight then wont start in the morning have to prime the diesel with the inline suction device under the bonnet then starts and runs fine

Air is getting into the fuel system allowing the diesel to drain back to the tank. Check fuel filter is tight, look along fuel line for leaks at any of the joints etc.

Jan 08, 2010 | 2004 Audi A4

1 Answer

My Audi A4 2000 TDI year 2005 has run on two tanks of Bio fuel recently and it hasn't recovered... started stuttering. Fuel system has been flushed out, air flow mand air flow meter has been changed but...

Audi 1.9 TDI and 2.0 TDI engines with pump-nozzle injection system, (year 2005 included), don't have permission to run with Bio fuel !!!
First you must replace fuel filter, interflow a quality Diesel additive (for 60 liters Diesel fuel dosage) fill up tank with Diesel fuel and run at least 300 km on highway at 3000-3500 rpm in 4-th gear.
I recommend you Foerch Diesel Reiniger System additive! I use this additive from 3 years ago and is certified on Audi TDI engines!

Dec 04, 2009 | 2000 Audi A4

1 Answer

Audi A4 engine sputters/no power

Hi i know exactly what is wrong I had the same problem with my A6 change the air mass flow meter or sensor min was wher the air filter is sat writ on the top n£45 from eby good lich.


Sep 10, 2009 | 2004 Audi A4

4 Answers

2003 audi a4 1.8t ECU/emission control system warning light flash

No I am a mechanic at Audi. The problem is that the the air flow to the central tappets may be causing the air flow sensor to trip and that is why. Try putting a small amount of WD40 into the petrol and that will work, its a very common problem.

Mar 18, 2009 | 2002 Audi A4

2 Answers

Mass airflow meter


It is fitted to the air filter outlet hose (the one which goes from the air filter to the turbo) and it is quite literally right next to the air filter. It has a wiring plug to it.



Jun 22, 2008 | 2002 Audi A4

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2005 Audi Allroad A6 interior lights door locks windows not working. Fuse 14 is OK and already changed CCM. Hello, my 2005 Audi Allroad C5 platform had some water in the BACK of the car due to clogged sunroof drain. The car was parking upwards in a slope and the amp ceased to work correctly when I turned on and off the car, the speakers made a lound sound. I removed the water from the back of the car then parked it inside a roofed and level garage. Three days later the battery was dead so I replaced it and removed the amp on the back of the car. About two weeks later, the car alarm started behaving strangely it would not stop when I pressed the remote control key, and at times would not stop even while driving, and the power lock worked only some times. A few weeks later the power lock ceased to work altogether not working from the remote control key nor from the button on the door, the interior lights stopped working and the windows stopped working too. I checked the fuse #14 and it looks good, I even changed it with another fuse. There was some humidity under the carpet but not too much, and there was no sign of water inside the CCM box. The connectors of the CCM were also looking good. Anyhow, I bought another CCM with the exact same number but nothing changed. I don't know what to do now. One odd thing that may or may not be related: the internal motion sensor light on the driver's door pillar remains ON no matter if I push it. The internal motion sensor light will turn OFF without fuse #14, so while I look for a solution, I have been leaving fuse #14 disconnected for fear if having the battery drain again, but I'm wondering if this could have something to do with the door locks / windows / interior lights problem. Thank you for your help

Dec 18, 2018 | Audi Cars & Trucks

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