Question about Cars & Trucks
What A4, lots made.
see here for list
it's a complex car, all are ofter 2007 and for sure Turbo's
as such can be very hard to work on , and diagnose.
noise and rough idle.
noise is a hands on deal, no net bunny here can guess. that.
but rough idle
that is called misfire.
if a diesel misfires , we check compression first.
the injection rates.
some times just looking at live SCAN data you can see a problem.
my advice find a good German mechanic.
no country stated, making all answer near useless. (oh shock of that)
in my shop i can see you, the car, and the tavern across the street
called Nunavut nook.
a clue. there.huh?
in USA Audio or any ASE certified shop.
or if USA< try alldata dot com.
Posted on Oct 12, 2013
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Posted on Jan 02, 2017
SOURCE: Check engine light
Funny that they changed the temp guage sensor....known problem on pre-2001 Audi TT and VW engines. Maybe yours was an early build 2002, so they helped you avoid a future problem.
As for the air flow, another known problem is the MAF (mass airflow) sensor. Don't panic, as this is a do it yourself job. Very likely problem if you ever installed a K&N type aftermarket air filter. These oiled filters cause buildup on the sensor. Free fix is to take the sensor body off (its the big ring/pipe coming off the air filter box before the rubber air intake hose) and clean the senor with isopropyl alcohol. Sensor body comes off by loosening the hose clamp on one end, and two screws into the filter box on the other. Don't forget to release the wiring harness plug by gently releasing the tab with a flat head screwdriver.
If your not comfortable with the cleaning, just find the MAF part on-line...about $200 bucks for a new one from Bosch. Very easy to do it yourself and a common failure point on the Audi.
For those still having the coolant sensor problem, also easy to replace yourself....about $10 bucks with a new o-ring.
Like GURU said, a code reader tool will tell if you have these problems, after the engine light comes on.
Posted on Jul 03, 2009
If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.
Posted on Oct 17, 2008
Have you heard of Noid lights? You unplug the fuel injector and plug these in and they will light up if the injector is getting power. This might give you a better hint. There are also lights that go inbetween the spark plug and wire. Between these two items you may be able to narrow down the problem to a specific system. I believe that your car has a coil pack. Some of these engines have problems with the crank trigger. I believe it is located on the back side of the motor. If you decide to change it, be careful. I have heard of them breaking into two pieces and becoming a big problem.
Posted on Jul 21, 2009
there are no codes that say replace O2 sensors,or remove converter,Thats just somebody's guessing,When it says O2 sensor that tells the mechanic to look for trouble in that area,wiring or faulty readings,And there are four O2 sensors.
Posted on Jan 20, 2010
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