This bulletin applies to 2015-2016 Subaru Legacy and Outback, 2014-2016 Forester, 2012-2016 Impreza 2.0L models, 2013-2016 XV Crosstrek and 2015-2016 WRX and STI models.
When DTC B1500 is found in memory, always start by following the diagnostic procedure in the applicable service manual. If diagnosis determines the fuel level sensor(s) (main and/or sub-level sensor) is faulty, always reference the applicable service manual when using the steps below:
1. If the fuel level is above 2/3 full, drain the fuel tank so the remaining fuel level is below 2/3 full. The recommended method for draining the fuel is by using the vehicle’s fuel pump. Follow the “draining fuel with select monitor” procedure in the applicable service manual. Always confirm that the container the excess fuel is being pumped into is clean.
2. Once the fuel level is below 2/3 full, remove the faulty fuel level sensor(s).
3. After removing the sensor(s), inspect the inside of the fuel tank for any foreign material or debris and clean as necessary.
4. Install the replacement fuel level sensor(s) in reverse order of removal.
5. Refill the tank with the drained fuel (where applicable). Use a filtered funnel. If fuel was drained without using the vehicle’s fuel pump, it should not be re-used due to risk of contamination.
6. Clear the ECM memory and confirm that the DTC does not reset and verify proper operation of the fuel gauge.