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It is not the left turbo, there is only one turbo. IT is the LEFT turbo intercooler. Looks like a radiator. IT uses coolant from the cooling system to reduce the temperature of the turbo. They are about 100 dollars to apiece. You could drive it BUT if it gets bad you loose all the coolant and must stop or you ruin the whole engine.
It is an electrical relay problem, that is part of the EFI system, I had an Audi of about the same age with the same problem many years ago. The relay was under the dash to the left of the steering wheel. Sorry, can't be more precise, but the dealer at that time had the relay in stock and one mechanic at the dealer gave me enough info to find the relay and replace it, and that solved the problem
If you go to ebay, under "audi 5000 87 ignition" you will see the full ignition block with new keys, and its only $49, and you can offer less since its best offer. You can check local junk yards, and parts stores, but you may not find the part due to the age, hope that helps
The ground? You'll have to be more specific. There are several grounds involved in starting the car. Whichever it is, it'll have to be repaired. This repair should be fairly simple -- replace the broken cable or clean the connection, then replace. There's no way to bypass the ground. Let me know which ground it is, and I'll try and look it up in the repair manual, and give you some tips on how to track it down and fix it.
That could happen from something as simple as an overdue air filter, bad plugs, or, unless you know it to be fresh, a failing timing belt, which could destroy your engine which I think is an 'interference' type that can have valves and pistons occupying the same space at the same time if the cam gets out of time.