Help keep the engine from cranking unless the transmission is in Park or Neutral with the Standard Ignition Neutral Safety Switch NS-666, an electrically operated switch made to OE spec for proper fit, form and function. It fits many vehicles, among them the 2011-2019 Hyundai Elantra, 2011-2015 Hyundai Sonata and 2011-2019 Kia Optima, as a direct-fit replacement for the listed applications. See the "Vehicles it fits" section for the full list.
A neutral safety switch reports the gear selector position to the starting circuit, so the engine is allowed to crank only in Park or Neutral. If a damaged original switch is behind a no-crank or intermittent-start condition, NS-666 replaces it and is designed to return normal neutral safety function.
- Made to OE spec: Standard Ignition builds its switches to OE specifications for proper fit, form and function.
- Copper alloy conductors: Used for strong electrical conductivity with low resistive losses.
- Direct-fit replacement: Replaces damaged OE units on the listed applications, helping keep the neutral safety feature working as intended.
- Robust construction: A robust design and high-grade materials meet the demands of today's service professional.
Signs this part may need replacing include no crank in Park, an engine that starts only in Neutral or only after moving the shifter, or an engine that cranks with the selector in gear. Other starting-circuit faults can cause similar symptoms, so diagnose the cause before replacing.
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
What does a neutral safety switch do?
It signals the gear selector position to the starting circuit so the engine is allowed to crank only in Park or Neutral. NS-666 is an electrically operated replacement switch made to OE spec.
Is the NS-666 the right Sonata switch for a 2011-2015 Hyundai Sonata?
Yes. It is a direct-fit replacement for the 2011-2015 Hyundai Sonata and also fits the 2011-2019 Hyundai Elantra and 2011-2019 Kia Optima. Check the "Vehicles it fits" section for other vehicles.
What are the signs of a failing neutral safety switch?
Common signs include no crank in Park, starting only in Neutral or after moving the shifter, or cranking while in gear. Other starting-circuit faults cause similar symptoms, so diagnose first.
What are the switch's conductors made of?
The switch uses copper alloy conductors, which Standard Ignition specifies for strong electrical conductivity with low resistive losses.
How is the NS-666 installed?
It installs as a direct-fit replacement for the listed applications. Follow the vehicle service information for the correct removal and installation procedure.
