Question about 2003 Jaguar X-Type

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Management light on fault found is p1646 what

Management light on fault found is p1646 what does it mean ?

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You can check out fault codes at http://www.bluejag.co.uk.
Looks like faulty Lamda Sensor.

Fault Code:- P1646 Indicates a Power-train fault


The fault is generally due to a problem in the Computer & Output Circuit area


Fault Description: ECM HO2 Sensor control malfunction -bank 1 upstream (1/1)

Action of ECM:- ECM Default:- HO1S 1/1 control circuit inhibited


After clearing the DTC, complete the Drive vehicle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- HO2 Sensor 1/1 heater failure HO2 Sensor 1/1 sensing circuit: short circuit to ground, short circuit to high voltage, open circuit ECM Failure

Posted on Jun 11, 2011

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SOURCE: engine management light on Fault code found p1646

P1646 is a faulty heater circuit on bank 1 upstream o2 sensor. If you have the V6 2.5 petrol engine, then bank 1 is the exhaust manifold nearest the bulkhead ( firewall if you in the states). Replace the upstream o2 sensor. Cost around £70from dealer...not available elsewhere.

Posted on May 28, 2011

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Apr 06, 2013 | Ford Cars & Trucks

1 Answer

My car have the code p1111 and p1646,which is that?


p1111 is nothing just letting you know system is ready after codes had been previously cleared, p1646 is 02 Sensor Control Malfuntion Bank 1 Upstream. Possible causes for p1646 o2 sensor went bad,short circuit to ground, short circuit to voltage, or open circuit. Code p1646 bank 1 sensor 1 o2 sensor control malfunction. Bank 1 is the rear bank and sensor 1 is the upstream sensor which you can see if you look between the engine inlet manifold and the brake booster(LHD). It is screwed into the manifold and has the grey connector next to the booster. You can check power to the heater on the white with green stripe wire. Any other testing will require a scan tool with datalogging capabilities. There were some VINs around your year that had their wires for that sensor twisted up by a faulty tool in the factory but you should be able to see that sort of damage easily.

Jan 03, 2012 | 2003 Jaguar X-Type

1 Answer

How to repair the p1646


Looks like Lambda sensor fault,

Fault Code:- P1646 Indicates a Power-train fault


The fault is generally due to a problem in the Computer & Output Circuit area


Fault Description: ECM HO2 Sensor control malfunction -bank 1 upstream (1/1)

Action of ECM:- ECM Default:- HO1S 1/1 control circuit inhibited


After clearing the DTC, complete the Drive vehicle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- HO2 Sensor 1/1 heater failure HO2 Sensor 1/1 sensing circuit: short circuit to ground, short circuit to high voltage, open circuit ECM Failure

See http://www.bluejag.co.uk for more info

Aug 30, 2011 | 2002 Jaguar X-Type

1 Answer

I have both a P1111 and P1646, what are these and how do you fix them


You can check out all fault codes at http://www.bluejag.co.uk

looks like faulty Lamda sensor.


Fault Code:- P1646 Indicates a Power-train fault


The fault is generally due to a problem in the Computer & Output Circuit area


Fault Description: ECM HO2 Sensor control malfunction -bank 1 upstream (1/1)

Action of ECM:- ECM Default:- HO1S 1/1 control circuit inhibited


After clearing the DTC, complete the Drive vehicle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- HO2 Sensor 1/1 heater failure HO2 Sensor 1/1 sensing circuit: short circuit to ground, short circuit to high voltage, open circuit ECM Failure

Jun 01, 2011 | 2003 Jaguar X-Type

1 Answer

Check engine fault code 1646


P1646 is a defective heater circuit on an o2 sensor. (bank 1 sensor1)I'm assuming you have the 2.5 V6 petrol engine? Replace the upstream sensor on bank1 to cure problem.

May 28, 2011 | 2003 Jaguar S-Type

1 Answer

Engine management light on Fault code found p1646 what does it mean ?


P1646 is a faulty heater circuit on bank 1 upstream o2 sensor. If you have the V6 2.5 petrol engine, then bank 1 is the exhaust manifold nearest the bulkhead ( firewall if you in the states). Replace the upstream o2 sensor. Cost around £70from dealer...not available elsewhere.

May 28, 2011 | 2002 Jaguar X-Type

1 Answer

X type fault codes p1111 & p1646 can you shed any light on them for me please ?


P1111 - System Pass
This is flagged after DTCs have been cleared, all engine management OBD diagnostic monitor drive cycles HAVE BEEN COMPLETED.

P1646 - Linear O2 Sensor Control Chip (Bank 1)
Its listed as either a faulty heated HO2 sensor ie lambda sensor (upstream bank 1) or a short (presuming the ECM is OK as no other codes)
Did you replace the right one... bank 1 is at the back of the V6, bank 2 is at the front so its the back one.

Hope this helps (remember to rate tis answer).

Jan 20, 2011 | 2002 Jaguar X-Type

2 Answers

Bad code p1646


P1646 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Feb 19, 2009 | 2002 Jaguar X-Type

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