| 摘要 |
A deterioration failure diagnostic apparatus for an exhaust gas sensor has a higher detection precision and a wider detection range against the deterioration failure of the exhaust gas sensor. An exhaust gas sensor is disposed in an exhaust gas pipe of an internal-combustion engine for producing an output corresponding to components of exhaust gas of the engine. The apparatus has a device for producing a detecting signal, which is multiplied to a basic fuel injection amount used at a normal operation to produce a fuel injection amount to be used for determining a condition of the exhaust gas sensor. The apparatus includes a device for extracting a frequency response corresponding to the detecting signal from an output of the exhaust gas sensor. The output is in response to the calculated fuel injection amount. The condition of the exhaust gas sensor is determined based on the extracted frequency response.
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