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Q:

Bank 1 Oxygen Sensors on 1999 Mitsubishi Galant

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P0141 Downstr Heated Oxygen Sensor Heater circuit fault - Bank No. 1 and

P0136 Downstr Heated Oxygen Sensor circuit fault - Bank No. 1.

Where are this O2 sensors. Is it on the front beside radiator? Thanks
(1) Answer
My suggestion is to get a repair manual if your going to work on your own vehicle, and it's easy and inexpensive to get a high quality repair manual. To be better prepared, read up on the job you're about to perform, it will show you component locations and what special tools you'll need.
Try http://bit.ly/mitchell_repair_manuals_online and you can have one in minutes, for less than $30.00.