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Another code I have is P0507 but I think it's unrelated. Any help on narrowing down the problem(s) would be very much appreciated. Thanks. :-l
Vehicle: 2003 Volkswagen Passat v6 manual drive 2wd

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HI there

P0101, 102,171 and 174 are all related. The 101 and 102 codes are for a faulty mass air flow sensor. When driving with a faulty maf sensor, eventually you will get the lean fuel mix codes, P0171 and P0174. Most likely replacing the maf will resolve these 4 codes.

P0491 and P0492 are secondary air pump function low on bank 1 and bank 2. These might be a result of a faulty air pump or possibly the issue with the mass air flow sensor. I think I would replace the maf sensor, then clear all codes and see what comes back.

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