Engine light keeps coming on indicated oxygen senors not working properly, replaced them 3 times and engine still comes back on after a week of driving. It is 2004 liberty with 148,000 miles.


Asked by Apr 25, 2013 at 12:44 PM about the 2004 Jeep Liberty

Question type: Maintenance & Repair

anyone else having this problem and if so what did you do to resolve it.

15 Answers

Tom Demyan

3 times? Getting an O2 codes doesn't walways mean it's the sensors themselves. There is another issue that will cause the O2 not to get the proper reading, tripping a code. Time for a trip to your mechanic.

12 out of 12 people think this is helpful.

why would they do this Tom? completely entombed in calcium deposits? burned down to the marrow with rich exhaust?

4 out of 4 people think this is helpful.

What was your mode of failure RCDunlop? sensor stopped emitting signal because the signal was blocked or because the sensor was burned away?


It was a mechanic that worked on it and replaced the sensors. He told me the next thing would be the computer board. Does that sound right?

...not really, the the reason the sensors are failing should be the area of concern. The ECU is probably faithfully doing it's job based on the data it's been given...should start looking for a vacuum leak, perhaps from/to devices such as the EGR fuel pressure regulator, evaporative canister vacuum and many places...personally would replace all vacuum lines with silicone rubber (the kind BMW uses) summit racing is one supplier, because butyl rubber is notorious for splitting, swelling and not keepin' it's end of the deal up~

2 out of 2 people think this is helpful.
Best Answer

...always get your parts back...this way we know if it's really been replaced...my mother had this problem with her '73 gremlin and was charged for a new starter~many hours of jurisprudence for something that was small peanuts~

got a propane torch? wave it over all the vacuum connections [unlit, of course] and note a change in rpm's----that's what should be replaced....really haven't given the benefit of the doubt to Jeep, perhaps they started making their vacuum hoses from the good stuff...test and find out~

http://www.amazon.com/Spectre-28906-Silicone-Vacuum- Hose/dp/B00062ZRI2

shipping is a little chompy on that, maybe you could find a supplier on your own at a 'custom shop' or even the BMW dealership~ think autozone has them~

http://www.oreillyauto.com/site/c/detail/GAT0/27075.oap?pt=N0890--- oreilly $8.99 plus shipping...only fleshy colored~~:(

1 out of 1 people think this is helpful.
James Ramond

or get a mechanic that can read codes, what's the trim value while running?

the O2 sensor actually gets eaten away (the expensive platinum part) have taken them off to find a hole where a probe belonged but still made with the micro-volt signal okay yet~

1 out of 1 people think this is helpful.

am leery of those that want to replace the ECU...because never have I seen where the ECU is at fault...it is ALWAYS proper grounding to the unit~

1 out of 1 people think this is helpful.

wirebrush the main ground connection [1/0 cable to frame] connection as dis- similar metals will evaporate and leave corrosion behind....coarse wirebrush this stuff all away till exposed metal...this will be your coarse to get the thing to behave properly~


I have replaced my O2 sensor three times and gas cap and check engine light has stayed on now it blinks at me and cuts my gas out for a minute mainly on hills then lunges me forward. However computer reads a random misfire replaced could and spark plugs. Terrible on brakes and bearings too. Any advice is helpful. I truley believe it's in the vacuume will post results.

5 out of 5 people think this is helpful.

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