Yes. The 2013 Nissan Altima's exhaust system is typically configured with two catalytic converters: one close to the engine and a second downstream in the exhaust path. This dual-cat setup generally applies to both the 2.5-liter inline-4 and the 3.5-liter V6 engines offered that year.
Understanding the layout helps with maintenance, emissions diagnostics, and part selection. The following explains what to expect in the two engine configurations commonly found in the 2013 Altima and what to check if you’re inspecting or replacing a catalytic converter.
Typical two-cat layout across the 2013 Altima engines
Note that while the dual-cat arrangement is common, exact placement and sensor configuration can vary by engine and market. The outline below reflects the standard expectation for the two main engines used in the U.S. model year 2013 Altima.
- 2.5L inline-4 (QR25DE): Typically features two catalytic converters in the exhaust path — a close-coupled cat near the exhaust manifold and a second converter positioned downstream before the exhaust exits the vehicle.
- 3.5L V6 (VQ35DE): Typically features two catalytic converters as well, usually one per bank, configured along the exhaust route to treat emissions from both cylinder banks before merging and exiting the vehicle.
In practice, this means most 2013 Altima models rely on a two-cat configuration to meet emissions requirements. Always confirm the exact setup for your vehicle using the VIN or service manual, since regional variations or special editions can differ.
Maintenance, diagnostics, and parts
When servicing catalytic converters, mechanics will use the vehicle’s VIN to verify the correct part numbers and placement. The O2 sensor layout (pre-cat and post-cat sensors) can influence diagnostic codes and replacement steps. If a code points to the catalytic converter, it could indicate a problem with either converter, a sensor issue, or an upstream exhaust problem.
Before replacing any converter, a proper diagnostic should rule out sensor faults, exhaust leaks, or fuel system issues that can mimic catalyst problems. This is especially important for older Altimas, where corrosion or impact damage can affect cat performance.
Summary
Bottom line: A 2013 Nissan Altima generally uses two catalytic converters in its exhaust system, across the common engine options (2.5L I4 and 3.5L V6). Always verify the exact configuration for your vehicle because regional variations or factory changes can apply. For precise parts and placement, consult the owner’s manual or a Nissan dealer with your VIN.