Mike,
Thanks for your reply.
Initially I got the MIL for P0171 and P0174.Took it to the dealer , dealer changed the air filter and reset the MIL light. Dealer also suggested to change the MAF sensor as they thought the MAF was not working.They told me that the MIL will come back after 1-2 trips.
The MIL did not come back until I drove another 200 miles(i.e 7-8 trips). Last week, the MIL came back again. This time the code was P0171. So I wanted to clean the MAF sensor. Strangely during the last 3 days the MIL came on and went off automatically and back again and went off again. So yesterday I cleaned the MAF sensor with an Electronics cleaner.I tried to open the MAF sensor connector but it was struck, so I had to clean it without opening the MAF sensor connector. My car is now working fine and the MIL is not on. Hope it does not come back again.
Any advice from you guys.
Thanks,
Biplab