Where is the catalytic converter on a Subaru?
On most Subaru models, the catalytic converter is part of the exhaust system and sits along the underbody, typically just behind the engine on the downpipe or integrated into the downpipe; many models use two converters, a pre-cat near the engine and a main cat further back.
General layout across Subaru models
Most Subarus place the catalytic converter along the exhaust path between the engine and the muffler. Exact placement varies by model, year, and market, but the cat is almost always in the front half of the exhaust run and is easy to spot as a stout metal canister with a heat shield.
Common configurations you may encounter:
- Single catalytic converter mounted in the downpipe just after the exhaust manifold.
- Two catalytic converters: a smaller pre-cat near the engine and a larger main cat further back along the exhaust path.
- Turbocharged models typically have the primary cat on the downpipe immediately after the turbo, with a second cat further downstream in the mid-pipe (varies by model).
Understanding these layouts helps you locate the catalytic converter on your Subaru, but always check a model-specific service diagram for precision.
Locating the catalytic converter on your Subaru
For a hands-on approach, inspect the undercarriage starting at the engine side and tracing the exhaust pipe toward the rear. Look for a stout, oval or rectangular metal canister with heat shielding and an oxygen sensor before or after it.
- Safely lift the vehicle or use a pit stand to gain access to the undercarriage. Ensure the exhaust is cool.
- Trace from the exhaust manifold or turbo downpipe along the exhaust pipe. Stop at the first large metal canister—that is usually the catalytic converter.
- Note if there are two canisters in line; the one closest to the engine is typically the primary cat (pre-cat in some older designs).
- Identify sensors: oxygen sensors are often located on both sides of the cat, with one before (pre-cat) and one after (post-cat) to measure efficiency.
Be aware that on turbo models the cat can be tucked near the turbo outlet, and on some models the exhaust path is long with two distinct catalytic converters. If you are planning modifications or repairs, consult the official service manual for your exact model/year.
Model-specific variations
Engine family and model year influence exactly where the converter sits. The following outlines typical patterns, though exceptions exist:
Non-turbo Subaru models (EJ/FB boxer engines)
In many older and some current non-turbo Subarus, a primary catalytic converter sits in the downpipe just after the exhaust manifold, with a possible second, smaller cat further downstream depending on market requirements.
Turbocharged models (WRX, STI, some Forester/Legacy variants)
The catalytic converter is usually located on the downpipe just after the turbocharger, and some years include an additional cat further back in the exhaust path.
Because configurations changed over time and by market, always verify with model-specific diagrams or a dealer/mechanic for your Subaru.
Summary
In short, the catalytic converter on a Subaru is part of the exhaust system and is typically found along the undercarriage, either as a single unit near the engine or as a pair of converters along the downpipe/mid-pipe. Exact placement varies by model, engine, and year; for precise location, consult the vehicle’s service manual or a parts diagram for your specific Subaru.
