2000 Jeep Cherokee P0138 O2 Sensor

JEEP CHEROKEE
Avatar
GHENGIS86
  • MEMBER
  • 1 POST
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
Sep 16, 2006 at 1:59 PM
Advertisement
Avatar
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.
Sep 16, 2006 at 3:58 PM
Avatar
DEMEARSJR
  • ✓Experienced 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.
Oct 1, 2006 at 3:23 PM

Suggested Repair

Bank 1 sensor 2 is the downstream oxygen sensor after the catalytic converter. A straight-six has only one bank and two O2 sensors; replace both given the mileage.

Conversation Summary

The owner of a 2000 Jeep Cherokee with 88,000 miles has code P0138 (O2 sensor circuit high voltage, bank 1 sensor 2) and asks which sensor that refers to and whether all sensors should be replaced. Replies identify sensor 2 as the post-catalyst sensor, note that a straight-six has one bank and two sensors, and recommend replacing both.

Related Repair Questions

Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle