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OBD II Code-O2 sensors

Tiny
GHENGIS86
  • MEMBER
  • JEEP CHEROKEE
2000 Jeep Cherokee Limited, 6 cyl, 88,000. My check engine light came on, so I took it to an auto parts store to have the computer scanned to get the trouble code. The code read: P0138, O2 sensor, circuit high volts (bank 1 sensor 2).

Question: How do I know which sensor (collector tube, before catalytic convertor, after cat.) Is refernced by "bank 1 sensor 2"? Also, with this many miles, should I just replace them all? Thanks

ghengis86
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Saturday, September 16th, 2006 AT 8:59 PM

2 Replies

Tiny
RUNTICH
  • MEMBER
  • 27 POSTS
Sensor 2 is the one after the cat. Bank 1 means which side of the exhaust it is but ur jeep is a straight six so u only have one bank. With this in mind u only have 2 o2 sensors but some cars have 4 not ur's. Also with this many miles I would just replace them both.
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Saturday, September 16th, 2006 AT 10:58 PM
Tiny
DEMEARSJR
  • MECHANIC
  • 110 POSTS
Sorry to say this used up cliche', but good call runtich.
Bank 1 usually refers to the side the number 1 pisston is on, bank 2 the oppisite side. Being a straight 6 you only have one side to work on.
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Sunday, October 1st, 2006 AT 10:23 PM

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