Keep your engine-management system listening for damaging detonation with the Standard Ignition Knock (Detonation) Sensor KS59. It installs as a direct-fit replacement for the listed Ford and Lincoln applications — including the 1997-1998 Ford Expedition, the 1997-1998 Ford F-150, and the 1998-2003 Lincoln Town Car — restoring the circuit that watches for abnormal combustion.
A knock sensor mounts on the engine and detects the vibrations produced when fuel ignites too early (detonation, or "pinging"), converting them into a voltage signal. The PCM reads that signal and retards ignition timing to bring combustion back under control. When this sensor fails, the PCM loses that input and can no longer make those corrections.
- Mechanical job: senses knock-related engine vibration and reports it to the PCM for ignition-timing control.
- Direct-fit: replaces the original sensor on the listed applications.
- Signs it may need replacing: a stored knock-sensor trouble code or an illuminated check engine light — diagnose the cause first, since these signs can have other sources.
Interchange: S8663 · SU2067 · DKS320 · E77Z12A699AA · F77F12A699AB · F77F12A699AC · F77Z12A699AA · Manufacturer part number KS59.
Fitment: 1997-1998 Ford Club Wagon; 1997-1999 Ford E-150 Econoline; 1997-1999 Ford E-150 Econoline Club Wagon; 1997-1999 Ford E-250 Econoline; 1997-1999 Ford E-350 Econoline; 1997-1999 Ford E-350 Econoline Club Wagon; 1999 Ford E-350 Super Duty; 2000 Ford E-450 Econoline Super Duty; 1999 Ford Econoline; 1997-1999 Ford Econoline Super Duty; 1997-1998 Ford Expedition; 1997-1998 Ford F-150; 1997-1998 Ford F-250; 1999 Ford F-250 Super Duty; 1999 Ford F-350 Super Duty; 1998 Lincoln Navigator; 1998-2003 Lincoln Town Car. See the Buyer's Guide tab for the full list.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the KS59 knock sensor do?
It detects the vibrations caused by engine detonation ("knock") and sends a voltage signal to the PCM, which then retards ignition timing to keep combustion under control.
Which vehicles does it fit?
It's a direct-fit replacement for many 1997-2003 Ford and Lincoln models, including the Expedition, F-150, Econoline vans, and Town Car. See the Buyer's Guide tab for the full list.
What are the signs this sensor may need replacing?
A stored knock-sensor trouble code or an illuminated check engine light. These can have other causes, so diagnose the fault before replacing the sensor.
What numbers does it interchange with?
S8663, SU2067, DKS320, E77Z12A699AA, F77F12A699AB, F77F12A699AC, and F77Z12A699AA. The manufacturer part number is KS59.
Will replacing this fix my performance issue?
Not necessarily. If a failed knock sensor is the cause, this replaces it, but other components can produce similar symptoms, so confirm the diagnosis first.
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