Two catalytic converters. One sits near the engine, and a second is located further back along the exhaust path; this setup applies to both the 2.5-liter four-cylinder and the 3.5-liter V6 configurations in the 2013 Altima.
Engine options in the 2013 Altima
The 2013 Altima was offered with two engines. Here are the options you could have, depending on trim level and market:
- 2.5-liter four-cylinder (QR25DE)
- 3.5-liter V6 (VQ35DE)
In both configurations, the exhaust layout typically uses two catalytic converters—one upstream near the engine and one downstream along the exhaust path.
Where the converters sit in the exhaust system
In most 2013 Altimas, the first catalytic converter is mounted close to the engine on the downpipe or near the exhaust manifold, while the second is located downstream along the mid-pipe toward the rear of the vehicle. The exact placement can vary slightly by model year or regional specification, but the two-converter arrangement is standard for these engines.
How to verify the number on your car
To confirm the exact count on your vehicle, inspect the undercarriage for the two converters along the exhaust path. If you’re unsure or you suspect a modification, consult the owner's manual or contact a Nissan dealer or a qualified mechanic for verification.
- Safely raise the vehicle and locate the exhaust system along the underside.
- Look for two separate catalytic converter housings along the exhaust pipe—typically a metal canister with a heat shield visible on each.
- If you only see one converter, your car may have a single-cat variant, a market-specific configuration, or aftermarket modifications.
Before counting, ensure the car is safely raised and properly supported, with the parking brake engaged and wheels chocked.
Note that regional specifications or aftermarket changes can affect the count. When in doubt, verify with the VIN or consult a Nissan service professional.
Summary
The 2013 Nissan Altima generally uses two catalytic converters, regardless of whether it has the 2.5-liter four-cylinder or the 3.5-liter V6 engine. One converter sits near the engine, and a second is placed downstream along the exhaust. For an exact count on a specific vehicle, refer to the VIN, owner's manual, or a Nissan dealership.