A Step-by-Step Visual Guide
Correctly identifying a catalytic converter is the key to getting an accurate quote.
Converter value depends on manufacturer type, internal material, and precious metal content — all of which start with proper identification.
Follow the steps below to identify your catalytic converter before requesting a quote.
Step 1
Confirm It’s a Catalytic Converter
A catalytic converter is part of the exhaust system and is typically located:
Between the engine and the muffler
Underneath the vehicle
Bolted or welded into the exhaust pipe
It usually looks like a metal canister with exhaust pipes attached on both ends.
Tip:
Mufflers are usually larger and designed for noise reduction, while catalytic converters are smaller and focused on emissions control.
Step 2
Check If It’s OEM or Aftermarket
This is one of the most important factors affecting value.
OEM (Original Equipment Manufacturer)
- Installed by the vehicle manufacturer
- Typically higher precious metal content
- Usually stamped with serial numbers or codes
Aftermarket
- Installed as a replacement
- Metal content varies widely
- Often fewer markings or generic branding
Rule of thumb:
Clear serial numbers = more likely OEM
Blank or generic casing = often aftermarket
Step 3
Locate the Serial Number or Stamped Code
Most OEM catalytic converters have stamped serial numbers, letters, or symbols on the outer shell.
What to look for:
- Letters and numbers stamped into the metal
- Partial codes (not full VINs)
- Manufacturer symbols or logos
Important:
Even partial or worn stamps are helpful. Take photos from multiple angles.
Step 4
Identify the Vehicle Type (If Known)
Knowing the vehicle origin helps narrow identification.
- Foreign vehicles (European, Japanese, Korean) often use higher precious metal loadings
- Domestic vehicles vary more widely
- Diesel or heavy-duty vehicles may use different emissions components
If the converter came from:
- A specific car or truck
- A fleet vehicle
- A shop or mixed load
Include that information when requesting a quote.
Step 5
Examine the Converter Size & Shape
Converter size, weight, and shape can indicate:
- Internal substrate volume
- Potential precious metal content
Things to note:
- Length and diameter
- Single vs multiple chambers
- Presence of heat shields or brackets
Step 6
Look Inside (If Safe & Appropriate)
If the converter is already cut or opened, the internal substrate can provide clues. Common substrate types:
- Ceramic (honeycomb, light-colored)
- Metallic (foil-like, darker, layered)
Step 7
Take Clear Photos for Identification
Photos are the fastest and most accurate way for experts to identify a catalytic converter. Best photos include:
- Full converter (entire unit)
- Close-up of serial numbers or stamps
- Side angles showing shape and size
- Interior (only if already exposed)
Things to note:
- Length and diameter
- Single vs multiple chambers
- Presence of heat shields or brackets