The oxygen sensor is mounted in the inlet side of the catalytic converter. The oxygen sensor monitors the exhaust gas and provides feedback about combustion efficiency to the engine control module (ECM). The catalytic converter reduces emissions most efficiently when the percentage of oxygen in the exhaust falls within a narrow range.
Oxygen sensor diagnosis is covered in 240 Fuel Injection. Oxygen sensor replacement is covered in 030 Maintenance.
A quick-check for detecting exhaust leaks is to hold a wet shop towel over the tailpipe outlet with the engine running. If any hissing is heard under the car, the system has leaks.
Toxic exhaust gases are colorless and odorless. Do not run the engine in a non-ventilated area. Repair any structural damage to the body or exhaust system immediately.
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