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| Detail Views Fastener Torque Specs Cylinder Head Tightening Sequence Intake Manifold Tightening Sequence Firing Order Other Tools OBD I Trouble Codes Decoding your VIN |
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| OBD I Fault Code Detail | |||||||
| Code 45 Oxygen Sensor Circuit Rich Exhaust Indicated |
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| The ECM suppies a voltage of about .45 volt between the O2 sensor signal circuit and the O2 sensor ground circuit. The O2 sensor varies the voltage within a range of about 1 volt if the exhaust is rich, down through about .10 volt if the exhaust is lean. The sensor is like an open circuit and produces no voltage when it is below 360 degrees C. An open sensor circuit or cold sensor causes "Open Loop" operation. Code 45 will set when the O2 sensor signal circuit - Remains above .75 volt for 2 minutes and in "Closed Loop" - Throttle angle between .52 and 1.1 volts - Engine time after start is 1 minute or more - No code 21 or 22 |
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