Question about Mazda Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
This code indicates the oxygen sensor on bank one is not operating properly. Check the wiring to this sensor for breaks or grounding before replacing the sensor.
Posted on Nov 05, 2009
SOURCE: 2004 jeep liberty P0139 code
PO139:O2 Sensor ckt Slow Response(Bank 1,sensor 2).This would be the odd side cylinders(1,3,5) and the 2nd oxygen sensor form the cylinder head.The sensor may be contaminated,or the heating element(on a 3 or 4 wire sensor) may not be working well.a good auto parts store should be able to show you a picture of where it is(the store will probably give you a printout if you buy the part form them!)
Posted on Sep 25, 2012
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