Catalytic Converter for Nissan Altima (2007-2016) 2.5L Rear

Direct-Fit Rear Catalytic Converter for 2007-2016 Nissan Altima

What it Does: The rear catalytic converter for the 2007-2016 Nissan Altima restores exhaust gas scrub efficiency, eliminates P0420 fault codes, and recovers lost engine performance caused by high-mileage exhaust restriction.

The Stock Nissan Altima Downstream Catalyst Degradation

Factory underfloor catalytic converters on the L32 and L33 platforms degrade progressively through thermal cycles and exhaust soot accumulation. The high thermal loading from the QR25DE inline-four causes factory washcoat attrition and internal ceramic substrate breakdown over extended mileage. As the porous matrix clogs, backpressure builds up the exhaust tract, causing increased exhaust gas temperatures, restricted exhaust scavenging, sluggish throttle response, and unavoidable illumination of the check engine light (CEL) due to degraded conversion efficiency across downstream oxygen sensor monitors.

The Engineering Solution

Engineered as a bolt-on solution, this rear assembly replaces the deteriorated OEM unit without custom cutting or welding. Fabricated with an automated-welded stainless steel outer casing, it resists road salt corrosion and road-debris impact. Internally, a dense ceramic monolith substrate is washcoated with active precious metals (platinum, palladium, and rhodium) to rapidly chemically reduce harmful CO, HC, and NOx emissions. Laser-cut direct-fit flanges and included high-temperature mounting hardware ensure leak-free seal integrity under heavy thermal expansion.

Technical Specifications

Compatibility

• 2007-2012 Nissan Altima 2.5L Base, S, SL (Chassis: L32)
• 2008-2013 Nissan Altima Coupe 2.5L S (Chassis: D32)
• 2013-2016 Nissan Altima 2.5L Base, S, SV, SL (Chassis: L33)

Frequently Asked Questions

Does this fit the L32 and L33 Altima?
Yes, this direct-fit rear converter assembly fits both the fourth- and fifth-generation 2007-2016 Nissan Altima equipped with the 2.5L QR25DE engine.

Will this resolve a P0420 catalytic efficiency diagnostic code?
Yes, replacing a compromised downstream substrate with this fresh washcoat assembly restores standard emissions conversion efficiency and clears catalytic monitor trouble codes.

The Nissan JDM Reliability Caliber

Engineered specifically for high-revving Japanese platforms, this direct-fit catalytic converter restores clean factory sound resonance, maintains balanced exhaust velocity, and delivers durable daily-driver performance.