witch side is bank 1 on 2003 Mitsubishi Eclipse

the check engine light is on and it said the o2 sensor on bank1 sensor 2 . I replaced it and the light will not go off I am trying to figure out if i replaced the right side. the o2 sensor i replaced is on the bottom in the front.

by in Lexington, KY on April 17, 2011
2 answers
ANSWER by on April 17, 2011
first of all, a code never identifies an bad part just a failed system. you need a flow chart for the code to determine if it is the wiring, a blown fuse from the heater, a bad pcm or something else causing the sensor to fail. it can get expensive throwing parts at it. let a shop help you with the diag so you know what the exact issue actually is. Roy
ANSWER by on April 17, 2011
the bank on v6's and v8's indicate which manifold the sensors are on.....bank one is always with cylinders 1-3(v6)/1-4(v8) there are 2 sensors on each bank ....one upstream of the cat and one downstream...sensor 2 is downstream.. the two cats that are bolted to the manifold are oxidation beds. The upstream o2 sensor (sensor 1) is located in the manifold, and it reads A/F based on the oxygen level present in the exhaust. The oxidation bed (pre-cat) then oxidizes, and removes all but around .2 percent of the o2 in the exhaust. The downstream is the sensor 2 on each bank. It is located after the cat and measures the change the cat causes.

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