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Greg, Technician
Category: Jaguar
Satisfied Customers: 7276
Experience:  Automotive diagnostic tech
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fault code p1646 how do I fix so as my engine light will go

Customer Question

fault code p1646 how do I fix so as my engine light will go out
Submitted: 4 years ago.
Category: Jaguar
Expert:  Greg replied 4 years ago.

Hi .

My name is XXXXX XXXXX i will be assisting you with this issue of your check engine light .

As you know the malfunction code can only be cleared once the management system sees that all system are working correctly ,

DTC P1646: ECM HO2 Sensor Control Malfunction - Bank 1 Upstream (1/1)



HO2 Sensor 1/1 heater failure

HO2 Sensor 1/1 sensing circuit: short circuit to ground, short circuit to high voltage, open circuit, high resistance

ECM Failure

This is normally only a straight forward replacement of the O2 sensor ,but i suggest you have the system first checked with a scan tool , as ECM are known to be the problem in some rare cases..

Need further assistance with this issue then please get back to me .

My goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back with the reply box below and not the poor or bad service button ,

For further assistance there is no extra charge after accepting.

Rgds Greg