Question about 2005 Audi A4

2 Answers

Random Misfire , Code 300 on OBD Scanner .

I just bought a 2005 A4 Audi Avant 3.0 at 60K couple months ago and I drove it today , the MIL was on and the car started shaking whenever I tried to speed up. A friend of mine who has OBD scanner told me that I have Code 300 which is random misfire. What cause this problem and what should I do before I take it to the dealership. Thanks.

Posted by on

  • Jredmond26 Oct 18, 2008

    i have had the same problem three times, i bought a 2004 audi a4 3.0 and every time i try to speed up it shakes and is non responcive i replaced one of the coil packs, then after a week the problem started again, i had all 6 sparkplugs repaced, this solved the problem for another week, now im having the problem again, what could it be?

  • Anonymous Jan 21, 2009

    Same problem thinking of pulling the battery and letting it reset. From what I know of small engines they rarely are the problem. It always seems to be the carbs.



2 Answers

Thanks for the response.
I took my car to the shop and had the coil packs replaced, out of 6 coil packs were dead.

Posted on Jul 16, 2008

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 13 Answers

Check spark plugs and coil packs

Posted on Jul 16, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Why is my car missing cylinders 2,4,6 $ random

What vehicle do you have,motor etc?
I would say you got bad ignition coils
or a reason for the PO300 codes
Stop using it
The codes or mil lamp is there to tell
you to get it fixed, as it wants to protect
the exhaust converter & the air we breathe
You Google the codes for the answer
OBD Code PO301 etc
Forget the 300 multiple misfire code,don't need that
You need professional help & professional test equip

Aug 09, 2013 | Cars & Trucks

1 Answer

Audi A4 avant tdi 2005-Problems with water build up in bulkhead?

Do you have a sunroof? If yes, you may have a clogged drain tube from the sunroof.


Oct 03, 2012 | 2005 Audi A4 Avant

1 Answer

1999 buick century-3100 v6 -obd code 302 comes on and off for about 6 months-then 2 weeks ago code 300 came on and no more today no more 300 but code 304.all code come on and go oof for a day or...

Is there raw fuel coming out of the hose or regulator . These regulators have a diaphram inside that rots and leaks , Causes rich condition . Can cause misfire codes , rough running .

May 17, 2017 | 1999 Buick Century

1 Answer

1998 Audi A4 Quattro, 2.8L, AHA, 75K miles, bought...

im a tech in the bronx and i dealt with the same code for the misfire. burt i realized that there wasnt any power to the coil of #2 cylinder. I replaced the sensor mounted on top of the air filter box, which solved this problem.

May 20, 2010 | Cars & Trucks

1 Answer

Login code engine A4 AVANT 2.5TDI V6?

It's different for every car after 2002ish. You need Vag Can Commander or similar software to extract the SKU surreptitiously if you are not an official dealership.

Feb 21, 2010 | 2005 Audi A4

3 Answers

2003 Audi A4 1.8T Check Engine light on

The CEL means there is a Diagnostic Fault Code stored in the Engine Control Unit. There are 1000's of DTC's, so you will need to have it read by a Code Reader. Auto Parts stores like Auto Zone, Pep Boys, perhaps even Advanced Auto often will read the code for you; but by law they cannot clear the codes. Many codes do not cause drivability problems, severe ones will trigger the ECU to run in a Limp Mode, which would require repair work before any trip longer than a few miles. Hope this is helpful.

May 31, 2009 | 2003 Audi A4 Cabriolet

1 Answer

OBD 2 code showing 300 & 301 cylinder misfire

there are alot of components that can throw those codes.... as a test pull one wire from the coil pack and note if the engine idle changes... replace it and move to the next one... repeat that for all cyclinders.... if you pull one and there are no changes you have likely located the cause.

Feb 23, 2009 | 2003 Audi A4 Cabriolet

Not finding what you are looking for?
2005 Audi A4 Logo

Related Topics:

1,143 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audi Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers


Level 3 Expert

77499 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14398 Answers

Are you an Audi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides