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AP Exhaust 645279 Catalytic Converter - Right
| Brand | AP Exhaust 645279 |
|---|---|
| Position | Right |
| Body Material | Stainless steel |
| Inlet Gasket | Not required |
| Inlet Hardware | None |
| Inlet Type A | 2 bolt loose flange w/ female flare |
| Inlet Type B | 2.50" id |
| O2 Sensor Ports | 2 |
| Outlet Gasket | Not required |
| Outlet Hardware | None |
| Outlet Type A | 2.50" id pipe w/ spherical flare |
| Overall Length (IN) | 45 |
| Substrate Material | Ceramic |
| Type | Federal / epa direct-fit |
| Fits | Lincoln · 4 vehicles |
Direct-fit replacement. Built to exact OE dimensions for straightforward installation.
Stainless steel body. Helps resist corrosion for long-term durability.
Ceramic substrate. Proprietary chemistry promotes efficient converter performance.
Cross-references 4L7Z5E212AB for the same application. See all 1.
OE-Fit Catalytic Converter for Navigator
AP Exhaust 645279 is a Federal / EPA direct-fit catalytic converter built for the right side of select 2003-2004 Lincoln Navigator applications. It uses a stainless steel body, a ceramic substrate, and OE-style inlet and outlet dimensions to support proper exhaust alignment and emissions system function.
For buyers searching for a 2003-2004 Lincoln Navigator right catalytic converter, this AP Exhaust unit is built to match factory dimensions and fitment requirements. Part number 645279 is also cross-referenced to 4L7Z5E212AB for the same application.
Key Features
- Federal / EPA direct-fit catalytic converter
- Stainless steel body for exhaust system durability
- Ceramic substrate material
- 2-bolt loose flange inlet with female flare
- 2.50" ID inlet and 2.50" ID pipe outlet with spherical flare
- Includes 2 O2 sensor ports
- Overall length: 45 inches
- Built to OE dimensions and fitment standards
Product Details
AP Exhaust 645279 is engineered for direct replacement on the right side of the Lincoln Navigator, with fitment listed for 2003-2004 models in Federal and California emissions configurations. The converter uses a ceramic substrate to support exhaust flow and emissions control, while the stainless steel housing helps resist corrosion in demanding underbody conditions. AP Exhaust uses automated manufacturing processes and spinner welding equipment to maintain consistent dimensions and fitment across production.
This part number, 645279, is a practical choice for drivers and repair shops looking for a direct-fit catalytic converter for Lincoln Navigator exhaust repair. It is built around OE-style connections, including a 2-bolt loose flange inlet and spherical flare outlet, to simplify alignment with the existing exhaust system.
Common Problems It Can Address
- Failed catalytic converter emissions testing
- Check engine light related to catalyst efficiency
- Restricted exhaust flow from a worn converter
- Rust or damage to the original converter housing
- Exhaust leaks at the converter connection points
Installation Notes and Tips
Fits 2003-2004 Lincoln Navigator, right. Verify the vehicle’s emissions configuration before installation, since this part is listed for Federal and California emissions applications and includes state-use restrictions noted by the manufacturer. Confirm the inlet and outlet connection style, O2 sensor port count, and overall length against the original unit before installation. Professional installation is recommended for proper sealing and emissions compliance.
Quality Assurance
AP Exhaust builds this converter to exact OE dimensions using controlled manufacturing processes for consistent fitment and production quality. Part number 645279 is intended as a direct-fit replacement for the specified Navigator applications and cross-references 4L7Z5E212AB.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2004 | Lincoln | Navigator | 5.4L | V8 | Right | Direct Fit; (03-04); Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details. |
| 2004 | Lincoln | Navigator | 5.4L | V8 | Right | Direct Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details. |
| 2003 | Lincoln | Navigator | 5.4L | V8 | Right | Direct Fit; (03-04); Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details. |
| 2003 | Lincoln | Navigator | 5.4L | V8 | Right | Direct Fit; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details. |
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