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P0139 Diagnostic Trouble Code Discussion for May 2007

Heated Oxygen Sensor (Bank 1 Sensor 2) Slow Response

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Trouble Ticket Help Requests for DTC P0139
Help Request Posted
1995 Jaguar XJ6 4.0L MIL Lamp on VIN: SAJHX1746S
P0139: Bank 1 Sensor 2 Slow Response. This one has me stumped. MIL is on with code for bank 1 lean. Looking at Oxygen sensors on labscope it appears that B1 S1 sensor is mostly stuck rich (flat-line at about 100 mV.) It will go lean (approx. 4.80 V.) when secondary air pump runs or when I blip the...
May 08, 2007