It is on left side after the cat.(downsteam o2)
SOURCE: PO137, PO 138 codes
well on my car these are reffering to the sensors in the exhaust, the upstream sensor(before the cat) and the downstream sensor(after the cat) the downstream sensor can act up if it is lazy or sluggish, or due to a bad catalytic converter or a clogged one. however there are sensors on the exhaust manifold which are determined by driver side or passenger,my opinion is to get a scanner for about $100 to $150 and you can figure out many of these codes yourself.
SOURCE: 2003 3.7 Liberty check engine light for crank sensor
2003 3.7 Liberty check engine light for crank....what? sensor? You have scanned it?
SOURCE: Oxygen Sensor jeep liberty
well first off depending on the year you could have up to four.now the easiest thing is to check trouble codes by turning yor key three times.now move it to the first position it moves to.thats were you need to end at all three times.now from that position you will move it quickly to the position when the accessories and idiot lites lite,right before it hits the starting position.so do that three times and wala if you got a problem with it your gonna know which one of the four you need to replace.follow the imortal saying of if it aint broke dont fix it ,oh ya to locate just look at other answer
SOURCE: 2001 Jeep Gr Cherokee V8 trouble code P0155 Oxygen
Sensor #1 is the sensor before the converter (upstream sensor)
SOURCE: oxygen sensor confusion
1/1 is upstream sensor on the number 1 cylinder side, 1/2 is the downstream of the number 1 cylinder side, 2/1 is the upstream of the number 2 cylinder side, 2/2 is the downstream of the number 2 cylinder side. Hope this helps.
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