WELLS Standard Replacement Ignition Misfire Sensor — direct fit for Mercury Mountaineer 5.0L V8 (1997-2001). Genuine quality replacement built to OEM tolerances, ships to all 50 USA states from RevXSC.
Engineered by WELLS as a standard replacement grade ignition misfire sensor for the 5.0L V8 engine, this 5S2129 matches factory mounting points and form factor so install requires no modification. Direct OEM-style replacement. Standard replacement spec — the same dimensions, materials and performance envelope as the original factory part.
| Year | Make / Model | Engine | Notes |
|---|---|---|---|
| 1997 | Mercury Mountaineer | 5.0L V8 | Ignition Misfire Sensor |
| 1998 | Mercury Mountaineer | 5.0L V8 | Ignition Misfire Sensor |
| 1999 | Mercury Mountaineer | 5.0L V8 | Ignition Misfire Sensor |
| 2000 | Mercury Mountaineer | 5.0L V8 | Ignition Misfire Sensor |
| 2001 | Mercury Mountaineer | 5.0L V8 | Ignition Misfire Sensor |
Always replace ignition misfire sensor components in matched sets where applicable, torque fasteners to factory spec, and inspect adjacent ignition components for wear during installation. If you're not sure which variant matches your VIN, send us the last 8 digits of the VIN before checkout and we will confirm fitment.
Is 5S2129 a direct replacement?
Yes — WELLS 5S2129 is built to OEM form/fit/function for the Mercury Mountaineer 5.0L V8 (1997-2001).
Do you ship to my state?
We ship to all 50 USA states. Tracking is provided.
What's the difference between Economy, Standard Replacement and Heavy Duty?
Economy is the value-priced option for everyday driving; Standard Replacement matches OEM spec; Heavy Duty uses upgraded materials for towing, fleet and severe service.
How can I confirm fitment?
Match year, make, model and engine (1997-2001 Mercury Mountaineer 5.0L V8). When in doubt, send your VIN — we verify before dispatch.
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Note: The product image is for illustrative purposes only. Actual product may vary slightly in appearance, packaging, or labeling. Fitment and specifications are guaranteed to OEM standards.