06/11/2026
These photos are from two different catalytic converter repairs we recently completed.
In the first photo, you can see an oxygen (O₂) sensor that had become seized in the catalytic converter. Over time, rust, corrosion, and years of service can make O₂ sensors difficult to remove, sometimes requiring replacement.
The second photo shows the internal catalyst material from a different catalytic converter that had broken apart inside the exhaust system.
Common symptoms of a failing catalytic converter:
• Check Engine Light
• Loss of Power
• Poor Fuel Economy
• Rattling Noise from the Exhaust
• Failed Emissions Testing
Common causes of catalytic converter failure:
• Engine Misfires
• Excessive Oil Consumption
• Coolant Contamination
• Physical Damage
• Age and High Mileage
Many people don't realize that a catalytic converter is often the victim of another problem. Replacing the converter without addressing the root cause can lead to premature failure of the new unit.
If your vehicle has a catalyst efficiency code, an exhaust rattle, or a Check Engine Light, proper diagnosis is the first step.
J & S Automotive
