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I am driving an Alfa 156 2.0 TS 1999 model , and have the following fault for the past 3 weeks:
The car stays on high idling even when stationary.
My Auto Eletrician tested with the Launch X431 and found the following codes:
0170 and 0100 , I would like to know the description for them , can somebody please help.:confused:
 

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You might not get the right codes using that system ... the pre-2000 156 didn't have a standard OBD system so needs MultiEcuScan really ... luckily that will read you codes in it's free to use mode if you also get a KKL VAG-COM interface cable.

But if they are being read correctly they are:

P0100: Mass or Volume Air Flow Circuit Malfunction ... replacement MAF required .. get a Bosch one!
P0170: Fuel Trim Malfunction (Bank 1) ... probably the lambda sensor ... again buy Bosch, NTK type doesn't work properly.


You may also have an air-leak ... mine was the oil separator valve behind the throttle body. The valve inside was missing and letting air in from the crankcase which meant my idle was 1200-1400 rather than 850 rpm. Check the "saga" behind this on my greenserpent website (link below)
 
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