DIRECT-FIT O2 Sensor for the following MERCURY models:
| MAKE | MODEL | OEM |
| MERCURY | 8.2L 502 V8 GM | 8M2003959 |
| MERCURY | 8.6L 523 | 8M2003959 |
| MERCURY | 5.7L 350 V8 | 8M2003959 |
| MERCURY | 6.2L 377 V8 | 8M2003959 |
| MERCURY | 4.5L 274 V6 | 8M2003959 |
| MERCURY | 5.0L 305 V8 | 8M2003959 |
QUICK & EASY DROP-IN INSTALLATION: Replace all worn components to RESTORE OE performance.
FEEL THE POWER DIFFERENCE! ENGINEERED TO IMPROVE PERFORMANCE AND GUARANTEE LONGEVITY. Designed and constructed for problem-free operation in excess of 2,500 hours or 100,000 miles. Upgraded polymers, brushes, and commutators guarantee consistent flow, amperage draw, and quiet operation.
THE IDEAL REPLACEMENT FOR MERCURY #: 8M2003959
- Brand Name:
- Quantum
Quantum brand products are backed by an industry-leading lifetime warranty. For fuel pumps, assemblies, regulators, and check valves, we will replace any unit that fails due to a defect in workmanship or materials for as long as you own the vehicle.
Serviceable & Wear Items: Please note that fuel filters, strainers, and rubber components (seals/grommets) are considered maintenance items. While these are protected against manufacturing defects, the lifetime warranty does not cover replacement for items that have reached the end of their functional service life due to normal debris accumulation or natural material aging (such as cracking or swelling from long-term fuel exposure).
This warranty applies only to the original purchaser and is non-transferable. Improper use or installation voids the warranty. Quantum is not responsible for incidental costs resulting from product failure. Contact customer service to troubleshoot, diagnose issues, and file a warranty claim.
Serviceable & Wear Items: Please note that fuel filters, strainers, and rubber components (seals/grommets) are considered maintenance items. While these are protected against manufacturing defects, the lifetime warranty does not cover replacement for items that have reached the end of their functional service life due to normal debris accumulation or natural material aging (such as cracking or swelling from long-term fuel exposure).
This warranty applies only to the original purchaser and is non-transferable. Improper use or installation voids the warranty. Quantum is not responsible for incidental costs resulting from product failure. Contact customer service to troubleshoot, diagnose issues, and file a warranty claim.