Oxygen Sensor Replacement - JeepForum.com
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post #1 of 4 Old 03-23-2010, 09:34 PM Thread Starter
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2004 WJ 
Join Date: Mar 2010
Location: columbus
Posts: 6
Oxygen Sensor Replacement

So my 2004 Overland gets maybe 14 mpg on the highway. I've cleaned the throttle body and replaced the plugs but still get lousy mileage. I'm thinking about replacing the O2 sensor even though the light isn't on. Should I try replacing the idle control module first or is this a better bet for improving gas mileage?

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post #2 of 4 Old 03-23-2010, 09:36 PM
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1993 ZJ 
Join Date: Jun 2009
Location: Wisconsin
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How many miles are on the Jeep?

Jeep: Every adventure is a repair, every repair is an adventure!
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post #3 of 4 Old 03-23-2010, 09:40 PM
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1999 WJ 
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IAC won't do much for fuel economy, put some good quality O2 sensors in (all of them)

99 WJ 4.0, 3.0" IRO, 265/75/15, 160,000km's and every km more something else goes wrong:)(sold)
97 XJ Rubicon 5.5" long arm 33's(sold)
07 WK wimpy V6, bone stock, not allowed to touch it(its the wife's)
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post #4 of 4 Old 03-23-2010, 09:55 PM Thread Starter
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2004 WJ 
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Thanks for the replies. I just recently bought the Jeep and it has 82,000 miles. I think I'll just replace the O2 sensors and hope the fixes the rough idle and the poor fuel economy.
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