Symptoms:
- In some cases, no symptoms
- Check engine light is on
- Loss of power
- Engine stalling
- Engine hesitating on acceleration
- Hissing noise on acceleration
- No start
Causes:
- A failed catalytic converter (multiple reasons for failure, including excess fuel being dumped into the exhaust, premature failure, internal component melting and more)
- A failed oxygen sensor
- A leak in the exhaust system above the catalytic converter
Possible Solutions:
- Replacing a failed catalytic converter
- Replacing a failed oxygen sensor
- Repairing exhaust leaks ahead of the catalytic converter