Question about 2005 Mitsubishi Galant
O2 seem to be working properly it have new battery please anyone
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Posted on Jan 02, 2017
If you disconnect the ground terminal of the battery can you see any sparks if you touch cable to the - terminal?
If you can, go to the fuse panel by the drivers left knee and remove the fuses one at a time. Each time you remove a fuse touch the battery cable to the - terminal and see if you have a spark.
Doing this will enable you to find the circuit that is drawing the current from the battery.
Hope this helps Good Luck Loringh PS Please leave a rating thks
Posted on Nov 09, 2008
I have the same vehicle, same code P0421, changed the BOTH O2 sensors and the check engine light was still on, took it to my fathers garage and checked the Catalytic Converter, and it was ok later I found out that P0421 means that the vehicle doesn't have the proper mixture of gas and air (running richer) so I changed the MAX air flow sensor and wala the code went away.
Posted on Apr 14, 2009
sounds like you have a short somewhere. without seeeing the car, i would suggest going to an auto electrician, not a "local garage" and god forbid... to mitsubishi (unless your loaded that is).
my gut feeling would be the alternator belt (aux belt) is getting old and worn and is slipping, causing a power fluctuation, but again, without seeing it, i cant diagnose.
good luck with it, fto's are fantastic so do what you can
Posted on Feb 15, 2010
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Removal & Installation
WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
NOTE Allow the O2 Sensor to cool down before conducting the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker.
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