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P1646 Diagnostic Trouble Code Discussion for October 2012

Hydraulic Cooling Fan Control Circuit Low

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Trouble Ticket Help Requests for DTC P1646
Help Request Posted
2003 Jaguar XJ8 4.0L MIL Lamp on VIN: SAJDA14CX3
P1646: Bank 1 sensor 1 o2 sensor. I have limited resources on this vehicle but im at a dead end.have replaced ecm,o2 sensor and still code returns quickly.checking resistance on all 4 wires and all the same 1.2 ohms.i can't read live data.i'm not getting definitive answers on shopkey as to whi...
October 15, 2012