Question about 1997 Jaguar XJ6

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Po158 po159 PO139 PO159

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After cat oxygen sensor fault.
Check wiring and sensors.

Posted on Apr 12, 2014

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Posted on Jan 02, 2017

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1 Answer

Troubleshooting codes Po139 & P0016


What make , model and year vehicle ?

Aug 21, 2017 | Cars & Trucks

1 Answer

Engine code139


OBDII PO139

Possible causes
- Timing belt or chain stretched or jumped
- Faulty Camshaft Position (CMP) Sensor
- Camshaft Position (CMP) Sensor harness is open or shorted
- Camshaft Position (CMP) Sensor circuit poor electrical connection.

Read more: http://engine-codes.com/p1391_chrysler.html#ixzz3UeAhEMOH

Mar 17, 2015 | 2000 Buick LeSabre

1 Answer

Have codes indicating bank 2 running lean(po174,po153,po159) also have codes for misfires on all cylinders. Does the misfire trigger o2 codes or does bad o2 sensor cause misfires?


misfire could cause o2 codes. o2 sensors are measuring the oxygen in the exhaust - if you're sending unburnt fuel through there (like a misfire), it would throw the value way off. if you're getting a 'lean' error, I would first suspect a bad fuel injector. But you are having a misfire on all cylinders... I would then look at the ECU as it may be having issues sending the 'open' signals to the injectors.

Oct 18, 2014 | 2003 Jeep Liberty

1 Answer

Diagnostic-codepo159


code p0159 refers to heated oxygen sensor(HO2S) 2 bank 2 --slow response Same for the oxygen sensor (O2S) ==causes --heating inoperative -wiring--HO2S sensor for the HO2S sensor and for the O2S sensor --wiring and sensor fault.

the HO2s sensors are before the cat convertor and the O2 sensors are after the cat converter.

Aug 14, 2014 | 2008 Ford F-250 Super Duty

1 Answer

2002 mercury villager code po325 code po138 code po139


P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0325 Knock Sensor 1 Circuit (Bank 1 or Single Sensor) -Circuit Malfunction
think you just need a new o2 sensor

Nov 03, 2013 | Cars & Trucks

1 Answer

2005 ACCORD ERROR CODE P0139


po139 is a code for o2 sensor slow response bank 1 sensor2 which tells me you have a v6 engine and this sensor is located after the catalytic converter on the side of the engine that the #1 cylinder is on.

Sep 11, 2012 | 2005 Honda Accord

1 Answer

Pcm code po139 eldorado


P0139: O2 Sensor CKT Slow Response (Bank 1 Sensor 2)

- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

Feb 07, 2012 | Cars & Trucks

1 Answer

MIL on


Actually the PO139 is Downstream O2 sensor slow to respond, And PO400 is EGR flow malfunction. But any why it sounds like the problem is in the exhaust system. I would start by checking the EGR valve first. Make sure the vacuum is operating it properly. If it is not that would make the O2 sensor slow to read or give the emissions system problems with oxygen readings. Good luck and have a good day.

Mar 28, 2009 | 1998 Subaru Legacy

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