How to fix a neutral switch on a 1986 camry - Camry Toyota Cars & Trucks

Question edited for clarity and add maker.
Question moved to model category

Just replace it before it fails completely.

https://www.google.com/search?q=2007+Toyota+Camry.+replace+neutral+safety+switch

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Manual or auto transmission?

See here p16

http://www.turboninjas.com/camry/ax2.pdf

Tune up,coils,fuel filter.check battery connection.

This is a problem in the Park/Neutral position switch or wiring.

Apparently Camrys of your vintage often suffer chafing and breakage of the wiring around the rear trunk lid hinge, driver's side. The backup light conductor there chafes and breaks, which the ECU sees as a fault P1780.

http://wiki.answers.com/Q/What_do_they_have_in_common_Toyota_Camry_2000_CE_trunk_lid_brake_lights_check_engine_light_P1780

Go to the Dealer. By law, they have to fix this!!

You have a problem with your Park/Neutral safety position switch that may require replacement of the switch.

P-1780 refers to a malfunction in the park/neutral position switch. You may have corrosion in the wiring connector, a bad park/neutral switch, or a wiring issue.

yes the neutral safety swich is not engaging due to loose or worn contacts. try to adjust or replace the switch to fix.

i think you might have a vacum leak.other wise when you adjust that screw.that should work..