FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
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Mercury
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1987
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Merkur Xr4ti L4-140 2.3L SOHC Turbo
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Sensors and Switches - Computers and Control Systems
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Oxygen Sensor
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Description and Operation
Oxygen Sensor: Description and Operation
XR4TI
The exhaust gas
oxygen sensor
supplies the ECA with a signal which indicates either a rich or lean condition during engine operation, after the sensor reaches operating temperature.