XJ-S Convertible (XJ27) L6-4.0L (1996)
Sensor 1 - Sensor upstream of the catalyst - close to the cylinder head
Sensor 2 - Sensor downstream of the catalyst - away from the cylinder head
NOTE: HO2S sensors and harness connectors are not identified as to position, so when sensors, harness or exhaust are changed they must be
label led to enable correct reconnection and location. Failure to observe this precaution may require the use of a Jaguar Diagnostic equipment to
re-programme the ECM.
Fig. 2 HO2S Circuit
Description
The HO2S resistance varies with temperature and so a heater is used to maintain a constant tip temperature of approximately 700 °C. At this
temperature the sensor output will be 3.3 V for lean running and 1.1 V for rich running.
Sensor Heater Open Circuit
HO2S Sensor Heater Open Circuit - Banks land 2 Sensor 1, P1185
HO2S Sensor Heater Open Circuit - Banks land 2 Sensor 2, P1191
Possible causes:
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Heater wiring open circuit
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ECM to heater connector open circuit
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ECM to heater wiring is short circuit to ground
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Both heaters open circuit supply - harness or connector faults
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Both heaters open circuit-sensor
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ECM hardware monitor fault implying open circuit heaters
Sensor Heater Short Circuit