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noticed my fuel millage had been getting worse. new air filter oil change, cleaned throttle body, mass air flow, no exhaust leaks, ran a scan tool that came up for the lean to rich sensor being off. any ideas,, also glad to be my first post and happy to start sharing my 2012 Nissan 2.5l with ya's thanks
 

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Replacing fuel filter has worked for me in the past.
 

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Replacing fuel filter has worked for me in the past.
Gen 2 don't have serviceable fuel filters. They are built into the fuel tank module.
 

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Generally routine checks should be able to help you solve any fuel efficiency issues if it's not caused by changes in your driving habits. I remember a story a customer told me about his mileage suddenly going bad and it turns out it was because his mum borrowed the car to go somewhere and she was terribly heavy-footed!
 
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