Keep your starter safely locked out of gear with the Standard Ignition Neutral Safety Switch NS-343. It installs as a direct-fit replacement for the 2003 INFINITI Q45, restoring the switch that allows the engine to crank only when the transmission is in Park or Neutral.
- Start-safety function: completes the starter circuit only in the permitted gear positions, helping prevent the engine from cranking while in a drive gear.
- Direct-fit replacement: designed to replace the original neutral safety switch on the listed application.
- Signals the transmission position: reads the selected gear so the vehicle's electrical system responds to Park/Neutral as intended.
A neutral safety switch that has worn or failed can produce common symptoms such as a no-crank condition in Park, cranking only when the shifter is nudged, or intermittent starting. If a faulty neutral safety switch is the cause of these signs, this unit replaces it; diagnose the starting circuit first to confirm the switch is the culprit before ordering.
Interchange: NS38055 · SW7478 · NS6837 · 34980AT900 — Manufacturer part number NS-343 (also NS343).
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the NS-343 neutral safety switch do?
It allows the starter to crank only when the transmission is in Park or Neutral, helping prevent the engine from starting while in a drive gear.
Will this switch fit my vehicle?
It is a direct-fit replacement for the 2003 INFINITI Q45. Confirm fitment for your vehicle before ordering.
What numbers does this part interchange with?
It cross-references NS38055, SW7478, NS6837, and 34980AT900. Its manufacturer part number is NS-343.
What are the signs of a failing neutral safety switch?
Common signs include a no-crank condition in Park, cranking only when the shifter is jiggled, or intermittent starting. Diagnose the circuit to confirm the switch is the cause.
Is this a genuine OE part?
This is a Standard Ignition OE-replacement neutral safety switch, manufacturer part number NS-343, built as a direct-fit replacement for the listed application.
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