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Engine light on after oil change.

 
Old 09-15-2013, 12:48 PM
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Default Engine light on after oil change.

Like so many others, for the past couple years my '07 Jk has been burning a lot of oil between changes. After much debate and researching on the Internet, I decided to try 5w30 synthetic instead of my usual 5w20 synthetic, as a lot of people say this fixes the burning issue. Changed my oil yesterday, put about 100 miles on it over the weekend and all of a sudden the check engine light lit up. Seems like an unlikely coincidence that it's happened right after the oil change.

Any suggestions? Should I just cut my losses and go back to 5w20? Do you think that will make the light go off?
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Old 09-15-2013, 12:56 PM
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The oil change is most likely unrelated. The first thing you need to do is scan it and see what code/s pop up.


Turn your key from off to on position 3 times and report what code pops up on the instrument panel. On third on leave it in on position. No start is required, just on position.

Last edited by Phrogmech46; 09-15-2013 at 12:58 PM.
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Old 09-15-2013, 02:28 PM
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Thanks, buddy. It came back with a P0430 code. Looks like something with the catalytic converter? Maybe exhaust? As far as I can tell there are no exhaust leaks. Should I assume my converter is F'ed?
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Old 09-15-2013, 02:37 PM
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Originally Posted by CanadianJames View Post
Thanks, buddy. It came back with a P0430 code. Looks like something with the catalytic converter? Maybe exhaust? As far as I can tell there are no exhaust leaks. Should I assume my converter is F'ed?
I would start with o2 sensors before spending money on a CAT. How many miles on it? Generic o2 sensors are usaully a lot cheaper, the only difference being you splice in the new o2 to the old o2's pigtail.
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Old 09-15-2013, 02:44 PM
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I would also double check for exhaust leaks especially from your exhaust manifolds. I have change both of mine because of cracks as long as 2 inches.
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Old 09-15-2013, 02:46 PM
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It's got 120,000 kms, so that's about 75,000 miles. I hear some emissions stuff is covered up to 8 years? Would that include the cat and o2?
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Old 09-15-2013, 02:56 PM
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Originally Posted by CanadianJames View Post
It's got 120,000 kms, so that's about 75,000 miles. I hear some emissions stuff is covered up to 8 years? Would that include the cat and o2?
A quick search shows that the CATS are covered 8 years/130,000 kms in Canada. O2 sensors will most likely not be covered. I would be bringing it in to the dealer ASAP.
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Old 09-15-2013, 03:05 PM
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Thanks, dude. Much appreciated!!!
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Old 09-15-2013, 03:07 PM
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Originally Posted by CanadianJames View Post
Thanks, dude. Much appreciated!!!
Good luck.
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Old 09-15-2013, 03:52 PM
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P0430 - Catalyst Efficiency (bank 2)

I would change the O2 sensors first before taking it to the dealer. By any chance do you hear a rattling from the mini cats? I had one on my WJ break apart and rattle.
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