Symptoms:
- Reduced fuel economy
- Engine hesitation
- Reduced engine performance
- Hissing sound on acceleration
Causes:
- Failed oxygen sensor
- An air leak in the exhaust before the catalytic converter
Possible Solutions:
- Replacing a failed catalytic converter
- Replacing a failed oxygen sensor
- Repairing exhaust leaks ahead of the converter
- Repairing or replacing damaged wiring or corroded connections