That goes to the diagnostic module pressure sensor (B5/2 in the diagram above). That device tells the ECM the intake vacuum or pressure in order to set lambda at idle in case your MAF fails. The sensor in my car is next to the ABS and Purge Valve (MOT) and is bolted to the driver side front wheel well. You should connect it with a vacuum hose. That might be the reason you got code 17.


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