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am3rican · Mar 3rd, 2005, 07:43 PM

My car has been throwing the P0420 code lately. its a 2001 Nissan Maxima SE 5spd w/ 38K miles. Well, the dealer told me my exhaust pipe (the y-pipe) needs to be replaced at a cost of $900, which i think is BS because my "service engine light" hasnt come back on in over a week.

Well, Ive been getting about 21-22 mpg, even though I drive 90% of my miles on the highway @ 75-80 mph. Now, being a 5spd, its rated at 22, 27 for city and highway.

Does anyone know what i can do to increase my gas mileage and whther the Y-pipe has anything to do with my gas mileage? and could it be that my exhaust sensors are bad and thats why im getting such crappy mileage? Will the dealer do a diagnosis for free concerning gas mileage if i have an extended warranty?

Mar 3rd, 2005, 07:43 PM	#1 (permalink)
am3rican Banned Join Date: Feb 2005 Location: New Jersey Posts: 200	Gas mileage My car has been throwing the P0420 code lately. its a 2001 Nissan Maxima SE 5spd w/ 38K miles. Well, the dealer told me my exhaust pipe (the y-pipe) needs to be replaced at a cost of $900, which i think is BS because my "service engine light" hasnt come back on in over a week. Well, Ive been getting about 21-22 mpg, even though I drive 90% of my miles on the highway @ 75-80 mph. Now, being a 5spd, its rated at 22, 27 for city and highway. Does anyone know what i can do to increase my gas mileage and whther the Y-pipe has anything to do with my gas mileage? and could it be that my exhaust sensors are bad and thats why im getting such crappy mileage? Will the dealer do a diagnosis for free concerning gas mileage if i have an extended warranty? Last edited by am3rican : Mar 3rd, 2005 at 07:45 PM.