Audi Repair Questions? Ask a Mechanic for Answers ASAP
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The sensors are integrated in the compressor and it definitely appears that you will have to replace the compressor to repair this problem. I do not recommend driving the vehicle with the compressor not cycling as it should, because the vehicle height will eventually drop to unsafe levels. It also puts extra stress on your airbags.
I hope this helps.
Hi and thanks again. Here is my VIN:
Chassis Type: 4B - Audi A6 C5VIN: WAUZZZ4B02N145734
Any detail on repair information would be much approciated.
Thanks for the information. The compressor is located where I described it above. The sensors are integrated into the compressor unit. However, I took a closer look at your initial problem description and have a few insights to offer.
One, you mention loosening 6 hoses. Those 6 hoses come out of the valve block. The valve block distributes the air produced by the compressor to the 4 air struts and the accumulator in the left rear part of your trunk. This block is separate from the compressor and should not be causing your problem. The compressor is located right next to the valve block. The compressor only has one hose and an electrical connector that needs to be disconnected.
Second, this is my take on the fault codes.
The 01400 is stored because your air suspension is not setting the vehicle to its proper ride height. This is more or less a generic code for a malfunction used to set the yellow warning light in your instrument cluster. This is not your root cause.
The 01772 is set for control pressure implausible signal. Basically, the air pressure in the system is not as specified. This is either a bad signal (due to a bad sensor) or the air pressure truly is incorrect due to a leak. Hold that thought.
The 01770 is stored for temperature. This can be a bad temperature sensor, as you have already found out from other sources. However, the sensor checks the compressor temperature, not air temperature or anything else. The sensor is designed to shut off the compressor if it gets too hot. A compressor overheats when it has to run more than it needs to, i.e. longer than what is normally needed to adjust ride height. This points to a leak in the air system, which is supported by the 01772 fault.
The botXXXXX XXXXXne is this: your compressor probably needs to be replaced, but after you do that, the air suspension needs to be checked for leaks. The concern is why did the compressor burn up after two years. If you have not replaced air bags on your car in quite some time, suspect a leaking airbag (especially the fronts.) They may only leak at a certain ride height, so do a complete check. Also, check the hoses and the valve block. The system can leak internally, but that is rare.
Finally, if the compressor did burn up, check the relay contacts. The extra current being drawn by the compressor can burn the relay contacts. The relay is installed in the relay panel behind the driver lower dash panel.
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