Two catalytic converters.
In the 2004 Xterra, equipped with Nissan's VG33E 3.3-liter V6, the exhaust system is designed with a dual-cat setup to treat emissions from both cylinder banks. This typically results in a total of two catalytic converters in the exhaust path.
Exhaust layout and converter count
Overview of how the converters are arranged and what that means for maintenance and replacements.
The 2004 Xterra uses one catalytic converter on each cylinder bank, meaning there are two catalysts in total. This dual-bank arrangement is common for V6 engines and is paired with sensors that monitor emissions before and after each converter.
Before listing the specific converters, note that the overall configuration centers on one catalyst per bank (often described as a close-coupled cat near the manifold and a downstream or main cat on the bank).
- Bank A catalytic converter — located on one exhaust bank, typically acting as the close-coupled cat near the engine.
- Bank B catalytic converter — located on the opposite exhaust bank, functioning as the secondary/ main cat downstream from the first converter.
These two converters work in sequence within the exhaust system to meet emissions standards, with corresponding sensors monitoring performance along the banks.
When planning replacements or diagnostics, verify the exact part count and placement for your specific vehicle, as regional specs or production variations can influence the arrangement.
Summary
The 2004 Nissan Xterra has two catalytic converters—one on each cylinder bank. This dual-cat setup is typical for a V6 of that era and year, and proper maintenance should account for both converters and their sensors to maintain emissions compliance and engine performance.
What are the worst years for Nissan Xterra?
Q: Which Nissan Xterra model years are considered the least reliable and should be avoided? A: When shopping for a used Nissan Xterra, it's best to steer clear of the 2004, 2005, 2006, 2007, and 2008 model years due to various issues and a higher number of complaints.
Can you unclog a catalytic converter instead of replacing it?
Unfortunately, cleaning your catalytic converter does not guarantee it will work effectively afterward. If your converter is defective, cleaning it will not make an impact, and any symptoms present before the cleaning process will return. In the end, if nothing works, a replacement is the way to go.
Does a Nissan Xterra have two catalytic converters?
Fits Nissan Xterra 3.3L ALL FOUR Catalytic Converters. ALL Four Catalytic Converter Direct Fit.
How much is a 2004 Xterra worth?
2004 Nissan Xterra Values and Prices
Estimated Trade-In Values range from about $1,175 to $1,800 depending on vehicle style. Estimated Private Party Values range from about $2,600 to $3,175 depending on vehicle style.