Catalytic Converter for Nissan Armada (2017-2021) 5.6L Left and Right

Direct-Fit Manifold Catalytic Converter Set for 2017-2021 Nissan Armada (Y62)

What it Does: This direct-fit left and right exhaust manifold catalytic converter pair replaces the bank 1 and bank 2 primary emissions assemblies on the 2017-2021 Nissan Armada (Y62) VK56VD 5.6L V8 to restore exhaust flow and catalyst efficiency.

The Stock Nissan Armada Manifold Converter Failure

On the Y62 platform powered by the VK56VD 5.6L V8, the primary catalytic converters are integrated directly into the exhaust manifolds adjacent to the cylinder heads. Severe thermal cycling, sustained towing loads, and rich-running misfires subject the factory ceramic monolith to extreme heat soak, causing internal substrate cracking or washcoat degradation. Once the honeycomb fractures, loose ceramic fragments obstruct exhaust flow and trigger downstream oxygen sensor faults such as P0420 and P0430, replacing OEM units 140021LA0C and 140021LA0D.

Common Symptoms of a Failing OEM Manifold Catalytic Converter

• Check Engine Light / DTCs: Triggers P0420 (Bank 1) or P0430 (Bank 2) catalyst system efficiency codes when precious-metal washcoat conversion drops below ECU thresholds.
• Audible Substrate Rattle: Fractured internal ceramic honeycomb pieces vibrate inside the manifold shell during cold starts or under acceleration.
• Exhaust Backpressure & Power Loss: Blocked catalyst passages restrict scavenging on the VK56VD 5.6L V8, causing sluggish throttle response, elevated exhaust temperatures, and failed emissions inspections.

The Direct-Fit Stainless Exhaust Solution

This two-piece manifold-converter assembly uses heavy-gauge stainless steel runners and housings to resist external corrosion and thermal fatigue cracking on both cylinder banks. Inside each unit, a high-flow ceramic honeycomb substrate coated with a precious-metal washcoat converts HC, CO, and NOx emissions to satisfy OBD-II monitoring parameters. Factory-positioned cylinder head flanges, mounting brackets, and threaded O2 sensor bungs ensure direct bolt-on alignment without cutting or welding, restoring balanced bank-to-bank backpressure across the Y62 chassis.

What's Included

• 2 x Exhaust Manifold Catalytic Converters (Left / Driver Side and Right / Passenger Side)
• 2 x Manifold Gaskets
• 2 x Outlet Ring Gaskets
• Studs, bolts, and nuts

Technical Specifications

Compatibility

• 2017, 2018, 2019, 2020, 2021 Nissan Armada SV (5.6L V8, Left & Right)
• 2017, 2018, 2019, 2020, 2021 Nissan Armada SL (5.6L V8, Left & Right)
• 2017, 2018, 2019, 2020, 2021 Nissan Armada Platinum (5.6L V8, Left & Right)

Frequently Asked Questions & Fitment Warnings

Does this fit the Y62 Armada?

Yes. This is a direct fit for the 2017-2021 Nissan Armada equipped with the VK56VD 5.6L V8 engine. This set does not fit 2005-2015 Armada models, and because it is EPA federal compliant (not CARB approved), it is not legal for vehicles registered in California, New York, Colorado, or Maine.

Will this clear P0420/P0430 codes, and are O2 sensors included?

Yes, it resolves catalyst-efficiency codes caused by a depleted converter, though oxygen sensors are not included. Transfer your existing O2 sensors or install new units after checking for upstream exhaust leaks when replacing 140021LA0C and 140021LA0D.

Are gaskets and mounting hardware included for installation?

Yes. Both manifold gaskets, both outlet ring gaskets, and mounting studs, bolts, and nuts are included; allow the exhaust to cool completely, soak fasteners with penetrating oil, and torque all flange bolts evenly before checking for leaks.

The Nissan Heavy-Duty Standard

Engineered for full-size Y62 SUV duty cycles, these dual manifold converters handle sustained towing heat while maintaining reliable emissions compliance. Replacing both banks simultaneously restores balanced exhaust scavenging and long-term drivetrain durability.