How many catalytic converters does a 2015 Subaru Legacy have?
Two catalytic converters. The standard 2015 Legacy exhaust setup generally includes two catalytic converters—one upstream near the engine and a second downstream in the exhaust path—to meet emissions requirements across the common powertrains for that year.
This article explains how many converters you should expect, where they're located, and what that means for maintenance and inspections.
Engine options and typical converter setup
In the 2015 Subaru Legacy, the two main engines—the 2.5L four-cylinder and the 3.6L flat-six—use two catalytic converters. This arrangement helps meet EPA standards and ensures proper operation of downstream sensors.
Two-cat layout overview
The typical exhaust path includes two conversion stages:
- Upstream catalytic converter (pre-cat) near the exhaust manifold to start reducing pollutants early in the exhaust stream.
- Downstream catalytic converter (main cat) located in the mid-to-rear portion of the exhaust, completing the conversion before gases reach the rear of the vehicle.
Note: Exact placement can vary slightly by trim and regional emissions requirements, but two converters remain standard for the 2015 Legacy.
Why this matters for maintenance and inspection
Having two catalytic converters means two sets of diagnostic sensors to monitor and two potential points for failure or clogging, so regular inspection of oxygen sensors and the exhaust system is important for emissions readiness.
Summary
In short, the 2015 Subaru Legacy typically has two catalytic converters, configured in upstream and downstream positions along the exhaust, across the common engine options in that model year.
