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Poor mileage S90-V90 1998

Hi, The first o2 sensor has the most influence. Before my 960 went heavy on the fuel i was still only doing 20 mpg (with a 2.5!!!) After the sensors replacement 30 mpg To me that says if you have 120,000 on the clock of your Volvo, you are 20,000 over the maximum mileage that the sensors are any good for which is quoted by most manufacturers. So whatever you do unless you change them first regardless of non-codes you are winning a losing battle with your consumption. Don`t put second hand ones in, buy new ones and you will get what you paid for and don`t forget they will last about another 1000,000 miles! Regards Keith






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