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Nissan Fuel Gauge Not Reading Accurately

by Eddie Carrara

I have been turning wrenches in the automotive business since 1986. My title is an ASE-Certified Master Technician, my mission is to help you understand the machine you drive every day and help save you some money along the way. If you find this site helpful, please comment and share the information.

Nissan Fuel Gauge Not Reading Accurately After Refueling.

If you’ve purchased a new Nissan and filled the tank with the engine running or the key on, your Nissan fuel gauge will not be reading accurately and you might see the ‘miles till empty’ display show 3 dashes and an incorrect reading. To fix this, disconnect the negative battery terminal for 5 minutes. Then, drive the vehicle for 5 miles. This should recalibrate the fuel gauge. 

Always avoid refueling with the key on or engine running to prevent triggering the check engine light. Modern vehicles perform diagnostic tests when the key is on, especially when the engine is running. 

These tests check emissions, electrical systems, and modules for inconsistencies and malfunctions. Even when parked, your vehicle is testing systems and updating software.

If you do happen to fuel your vehicle with the key on or with the engine running, it’s likely that your emissions monitor will have detected a significant leak on the fuel tank side, P1456, and will illuminate the yellow check engine light. 

In older vehicles, you could easily disconnect the negative side of the battery for 5 seconds to clear the code, until the problem occurred again. However, those times are gone. 

Today, vehicles will store the code for several drive cycles, and the only way to clear the check engine light is to drive the vehicle for three complete drive cycles. Each cycle involves starting the engine from a cold state, allowing it to reach normal operating temperature, then shutting it off and letting it cool completely before the next cycle. Alternatively, you can clear the code with a handheld scan tool.

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