Hey Guys,

The check engine light on my 1998 s600 recently went off. I took it to autozone and got the codes read and it said there was a multiple cylinder misfire. I changed out all the spark plugs to factory specs and found the old spark plugs were over gapped by 1... were as the factory specs is .81.. The car has 61,000 miles on it. On the code reader it also said there was a problem with oxygen sensor bank 2 sensor 1. I dont think the problem is an oxygen sensor because they were changed out not too long ago. Iam suspecting an air leak somewhere I dono why but just a hunch. ANY IDEAS or any form of help will be greatly appreciated! Iam taking the car to the dealers on Monday, what questions should I ask them?