P1805 2009 NISSAN SENTRA - Stop Lamp Switch
- Faulty Stop Lamp Switch
- Stop Lamp Switch harness is open or shorted
- Stop Lamp Switch circuit poor electrical connection
Tech notesCheck to see all the brake lights are working, if they are not check the stop lamp switch. (see picture)
- Engine Light ON (or Service Engine Soon Warning Light)
P1805 2009 Nissan Sentra DescriptionBrake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is driving.
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