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Re: Audi 2000 A6 2.4 cooling
I believe the One sensor is there at the right on the side of the engine head. If you face to the engine from the front of the car, you will see there are 5 boots wire that plugged to 5 sparks, Besides boots wires, there is another wire that connected to a connector on the engine head. It is the O2 sensor connector of the engine, the sensor is used to control the gas-air ratio. When you replace the electric distributor and the boots wire, you usually would unplug this sensor without plug it back. It will cause your engine fuel consuming and hard to start when engine is cold.
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I am going to say 'blown turbo'. As I understand it, they needs replacing every few years. They are susceptible to heat and incredible revolutions. They have to be lubricated, the seals go, and you get smoke.
Hi there:the Audi manual never talks about a 2 stage aux fan just that the aux fan runs with ac on and it can run with out ac on if there is an overheat issue on the coolant side where as the a4 info clearly states a 2 stage aux fan system that would lead me to think the early 4.2 did not use a 2 stage system. Your car is not overheating and boiling over out of the coolant tank it is showing a little hotter than what would be perfect but it is still in what Audi calls acceptable range. The whole coolant system is new I would start looking at your sensor and gage systems there is a coolant sensor in the rad but that is most likely new if they replaced the rad. The gage uses a temp sensor on the engine for the gage I would replace that sensor and test the gage with a resistance input tool we have at the dealer. Could be a gouge or the wiring to it. There is a coolant fan module that could be defective if your sure there was a two speeds to the aux fan.
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IMPORTANT NOTE: You must have the security anti-theft code for your Audi radio from the car manufacturer, or from an Audi dealer!
The sequence of programming for 2000 Audi A4 radio is: 1. Push simultaneous "SCAN" and "RDS" keys until on the screen will appear "1000" displayed. 2. Release keys. No more push on "SCAN" and "RDS" keys because otherwise number "1000" will be considered as first safe code attempt. 3. By the #1 key you will set up the first safe code digit. 4. By the #2 key you will set up the second safe code digit. 5. By the #3 key you will set up the third safe code digit. 6. By the #4 key you will set up the four-th safe code digit. 7. Then push again simultaneous "SCAN" and "RDS" keys for confirm this safe code. On the screen will be displayed "SAFE" notice. Release keys! For few seconds a radio frequence will be displayed. The radio is now ready for use!
changing the engine sensor is easy when engine is cold and make sure you refill with antifreeze ,Buy sensor first so you know what to look for its not expensive from a motor factor .i honestly cant remember ever changing one on this model but it must be around the head area somewhere