Catalytic Converter for Nissan Frontier (1999-2001) 3.3L Left & Right

Direct-Fit Replacement Catalytic Converter Set for 1999-2001 Nissan Frontier (D22)

What it Does: The catalytic converter set replaces deteriorated factory emissions units on the 1999-2001 Nissan Frontier to restore balanced exhaust flow, eliminate check engine diagnostics, and reduce tailpipe emissions.

The Stock Nissan Frontier Substrate Degradation

Over extended operating cycles, the factory catalytic converters on the D22 platform suffer from washcoat sintering and thermal fracturing. Unburned hydrocarbons and thermal fatigue foul the OEM substrate, triggering persistent diagnostic trouble codes such as P0420 (Bank 1) and P0430 (Bank 2). A clogged or rattling ceramic matrix also generates severe exhaust backpressure, choking cylinder scavenging on the VG33E engine, which degrades fuel economy, blunts throttle response, and elevates cylinder head temperatures under load.

The Engineering Solution

This direct-replacement assembly provides a dual-bank solution engineered to restore federal emissions compliance and factory exhaust velocity. Fabricated with heavy-gauge 409 stainless steel outer canisters, the units house high-density 600 CPSI cordierite ceramic substrates loaded with a balanced palladium and rhodium wash coat for efficient catalytic conversion. Smooth, mandrel-bent inlet and outlet sections minimize turbulence, while precision-machined flanges mate cleanly with OEM manifolds and downstream intermediate piping. Pre-welded oxygen sensor bungs occupy exact factory locations to ensure seamless reinstallation of stock upstream and downstream O2 sensors without harness modifications.

What's Included

• 1 Left (driver side) catalytic converter
• 1 Right (passenger side) catalytic converter
• Mounting hardware

Technical Specifications

Compatibility

• 1999 Nissan Frontier 3.3L V6 (VG33E)
• 2000 Nissan Frontier 3.3L V6 (VG33E)
• 2001 Nissan Frontier 3.3L V6 (VG33E)

Frequently Asked Questions & Fitment Warnings

Does this fit the D22 Frontier?

Yes, this is a direct fit for the 1999-2001 Nissan Frontier equipped with the VG33E 3.3L V6 engine. This part is not legal for sale or use in California, Colorado, New York, or Maine on CARB-governed emissions vehicles.

Will this converter set resolve P0420 and P0430 fault codes?

Provided there are no underlying upstream issues such as unmetered air leaks, misfires, or faulty oxygen sensors, the active palladium and rhodium substrate will restore converter efficiency and resolve catalyst-related DTCs.

The Nissan Frontier Durability Standard

Engineered for working trucks, this bolt-on exhaust solution delivers reliable backpressure management to protect your low-end torque curves when towing, hauling payloads, or logging extended highway mileage.