O2 Sensors and my check engine light - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > Grand Cherokee General Discussion > O2 Sensors and my check engine light

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineWIN a Rough Country Forged Track Bar - ExtremeTerrain!1987-2016 Wrangler Jammock Black 2.0 Jeep Hammock (YJ, TJ

Unread 05-17-2010, 10:37 AM   #1
Registered User
1997 XJ Cherokee 
Join Date: May 2010
Location: Westerville
Posts: 2
O2 Sensors and my check engine light

So I recently purchased a 97 Grand Cherokee Laredo under book price which needed some mechanical work. As we are getting into the vehicle, I checked the codes and it was due to O2 sensors, so I crawled under to check it out. The previous owner had replaced the exhaust with one that does not have a catalytic converter and no spot for the post-cat O2 sensor so the wiring is just zip tied up in there. Also the pre-cat sensor is in, but it was disconnected. I know that with them disconnected it will just default to a set fuel ratio, but I was wondering if I should hook up the pre-cat sensor and make a way to install the second sensor? I want to get good mileage and be nice to the engine, but without the cat. conv. I didn't know how that would affect the readings.
-Jeep Greenhorn

MicahHudson is offline   Reply With Quote Quick reply to this message

catalytic converter , emissions , exhaust , o2 sensor

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.