Question about 2005 Audi A4

1 Answer

Weird warning light behavior and rough idling.

Today, my 2005 Audi A4 2.0T began to "freak out." First, when I started the car, all of the warning lights came on, then went off one-by-one. While driving the car, check engine light came on and then the hazard lights came on by themselves and the alarm began to flash. Now, the check engine light stays on and the car is definitely rough-idling. Has anyone had any experience with this or such as this?

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 48 Answers

First of all your car needs too have the battery disconnected but only the negative terminal, usualy black in color if you have caps over the terminals. second wait 10 minutes before you reconnect it. third have a auto parts store hook it up too a code reader, it will tell you everything that you want too know about what is causeing the problems.....most places do it for free as a service.

Posted on May 22, 2009


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 expert 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 repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (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

My car intermitently discharges black smoke and today jus began to shudder and the epc and emissions alarm came on

The first thing that you must do is to run an OBD2 fault test to see why the warning lights came on, that will give you a system to check.

Jun 08, 2016 | 2011 Audi A3 S3

1 Answer

Heater stopped working loss of coolant and rough Idle

I had a similar experience. Finally the car started overheating. Turned out the thermostat went bad and the radiator blew a leak. Had those replaced. Runs great.

Feb 09, 2013 | 2005 Volvo S40

1 Answer

94 chevy astro rough idle and surge when driving

check throttle body and check for codes

Feb 06, 2013 | 1994 Chevrolet Astro

1 Answer

Yellow engine warning light and car has rough idle

to get trouble codes you must hook up a test tool called a scanner, this interfaces with the computer in the car and pulls the codes from the computers memory.

Sep 09, 2009 | 2002 Audi A4

1 Answer

Battery warning light is on with weird noise

This either means your battery has failed or the alternator. You can use a voltmeter to monitor battery voltage it should maintain at least around 13 with lights on if it gets low and car eventually stalls replace alternator. Thanks

Jun 07, 2009 | 2005 Chrysler Town & Country

1 Answer

A4 2.0 TDI. Rough idle

You could have a bad air flow sensor. Do you also have a lack of power??

May 13, 2009 | 2005 Audi A4

1 Answer

Whistling noise in engine and rough idle

check all vacuum hoses,sounds like a leak, try spraying carb cleaner near noise,if engine rpms go up you found the leak

Apr 09, 2009 | 1998 Audi A4

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

432 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audi Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers


Level 3 Expert

76649 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14380 Answers

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

Answer questions

Manuals & User Guides