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Re: state Emissions Test
Sounds like a failure of the engine coolant temperature sensor, which is a known weakness on the B5 chassis Audi A4 (model years 96-01). The sensor is relatively inexpensive ($20-30) and if you call up ECS Tuning (www.ecstuning.com) or Pure Motorsports (www.purems.com) with your VIN number, they can send you the correct sensor (there are three types, identified by color of the connector - black, blue, or green). Changing it is somewhat of a pain due to its location, but it can be done in 30-40 minutes. You have the 12 valve 2.8 V6 - take a look at www.audidiy.com and www.12v.org (two dedicated Audi sites) - there are a ton of tech procedures on those sites, and you'll likely find what you need there - a detailed, step by step, photo-referenced procedure on how to change the sensor.
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Is this you instrument cluster? vtraudt image
If so, top left would be coolant temperature warning light.
What is the coolant temp gauge reading?
I would suspect faulty coolant temp sensor.
Also check if your coolant reservoir sensor (plugged into the bottom of you coolant tank) is plugged in (I often forget to plug it back in; the retainer also easily breaks and the plug can slip out).
The crank shaft position sensor is to tell the cpu when to allow spark at the right time. IT normally works or it doesn't. Lack of take power for take off can be associated with low fuel pressure for the injectors and MAF/MAF sensor faults.. have a pressure test done on the fuel system to check for regulator failure.
yeah the price sounds about right emissions parts on audis are really expensive. you could always shop around online and try to find a used one that is still in good shape with no cracks. I know cause i own Audi A6 2.7t 2001 and also work on it myself.
P0116 Engine Coolant Temperature Sensor Performance, This DTC is usually set by a defective coolant temp. sensor or the related wiring. However, there is an old service bulletin. TSB#18-017-03 that calls for replacement of the Powertrain Control Module to repair this condition.
Hi, the sensor on the engine (right at the rear end of the cylinder head) has two separate outputs. One drives the temperature gauge and the other provides data for the engine control unit. The output for the engine control unit is almost certainly faulty and the sensor will need to be replaced. It isn't an expensive item and's not time consuming to replace (1/2 hr) - so you could ask Audi to do it for you when they replace the ignition coils.
Hope that helps Matt..
The light is comming back on because you have a problem in the emission control system, without the code I can't help you any further, one note it takes the system a couple of days to go through self test before it decides there is a problem, that is why the delay.
what i used to do is pour a small bottle of rubbing alcohol in the gas tank....this mixture burns very hot so it will clean everything out thus burning all the gas particles off......i used to do this in a 1988 mustang gt that ran real rich because of performance parts and i couldnt ever get it to pass the tests....also try o2 sensors as well as possibly map sensor if equipped...this could be the problem....
temp gauge not working? check wiring and also check tempature sending unit and block temperature sensor.