Ok so it is time to get my 2002 dII inspected and i replaced the o2 sensor up stream now i am getting p1171 code. I have checked the MAF and it seems to be doing fine but my expertise in limited on it so maybe that is it but i dont want to just replace it so help diagnosing it will be grateful. I also have a snorkel has anyone else had any complications with this. I am pretty much at a loss and dont want to just continue to dump random money so any help with be appreciated.