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Old 07-17-2013, 01:52 PM   #1
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MIL on? Exhaust thread

My 06 rubi started normal to give the check engine light 3 weeks ago. At first i was wheeling and in the middle of the night when i was coming home, and suddenly the MIL came on. I did the key trick and it was code p0153 o2 sensor bank 2 sensor 1 slow response. So i reset the ecu to check it.
And yesterday it came back on but now with the code p0133. O2 sensor bank1 sensor 1.
And im checking the meaning and its exhaust leak or poor performance of the o2.
What do i know so far is that indeed i have a exhaust leak but its on the second header where the header connects to the doughnut and the catalytic converter.
Could this be the fail? Engine still runs pretty fine no mpg increase great power as always.
But im thinking to tighten the bolts they might be came loose. But i heard that they can break very easily.
Should i do it? What else do i need to check?
I cant belive that the o2 sensor are going bad my jeep only has 52312 km.

Thanks for your help

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Old 07-18-2013, 10:36 AM   #2
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Update yesterday i reset the ecu and today is back on with both codes p0133 and p0153.
What to do???

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Old 07-18-2013, 11:02 AM   #3
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Help! XS
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Old 07-18-2013, 11:06 AM   #4
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Old 07-18-2013, 11:27 AM   #5
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if you have an exhaust leak then its very possible that leak is causing the o2 sensor lights to come on, the exhaust gas is escaping before it reaches the o2 sensors throwing the readings off and causing the engine light to come on. id recommend fixing the exhaust leak and resetting the light
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Old 07-18-2013, 12:29 PM   #6
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Thanks for your help. Well right now im searching for the leak. So far the bolts were pretty damn loose. Not only the bank 2 the bank 1 was almost coming of. So i think this should fix it. I did torque the exhaust manifold bolts also and they were tight but the bolts before the first 2 cats where the problem. Im restarting the ecu. And so far the exhaust sound changed alot! But still im searching for another leak just in case.

Thanks buddies
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Old 07-18-2013, 08:46 PM   #7
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Codes are back!!!! Same codes. Engine still runs fine and i couldnt find any other exhaust leak!
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Old 07-18-2013, 09:50 PM   #8
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Quote:
Originally Posted by TCogley View Post
if you have an exhaust leak then its very possible that leak is causing the o2 sensor lights to come on, the exhaust gas is escaping before it reaches the o2 sensors throwing the readings off and causing the engine light to come on. id recommend fixing the exhaust leak and resetting the light
Assuming you did the above, have you replaced the upstream O2 sensor in question?
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Old 07-18-2013, 11:23 PM   #9
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Originally Posted by DermJeep View Post

Assuming you did the above, have you replaced the upstream O2 sensor in question?
No actually that what i dont want to do. Its to early to change them i only have 52400 km but thats the next thing to do i guess.
Could it be a problem if a make a trip tomorrow with those codes? Its gonna be 600 km round. But im gonna tow my boat.
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Old 07-18-2013, 11:30 PM   #10
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Mine were reading slow too. My 05 had bad catalytic converters at 20,000 miles... Hole burned clean through the catalyst. It still ran fine too.
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Old 07-19-2013, 06:23 AM   #11
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Originally Posted by jeepstertj View Post

No actually that what i dont want to do. Its to early to change them i only have 52400 km but thats the next thing to do i guess.
Could it be a problem if a make a trip tomorrow with those codes? Its gonna be 600 km round. But im gonna tow my boat.
Sometimes when you hear hoof beats, you don't think "zebras!" I had the same issue on a VW Jetta last year that I chased around too much- it was the sensor.

Shouldn't be an issue short term, but long term ( many many miles) running with failed 02 sensors will hurt fuel consumption. It's a $70 part ( in the US), just change it and see. If you have a digital multimeter and a service manual, you can at least check the low end (cold state) output signal.
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Old 07-19-2013, 07:58 AM   #12
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Ok i will do the trip and later change the o2's i will keep you updated as soon as i get it fixed!
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Old 07-24-2013, 12:16 AM   #13
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Jeep is right now with the dealership. 5 mechanics couldn't find a fail with the o2 they are working perfectly. There isn't a exhaust leak. The dealership expert told me that the ecu is receiving a false signal and thats is the problem why? Where? Im gonna keep you updated as soon as the jeep gets fixed.
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Old 08-15-2013, 06:32 PM   #14
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Well, what was it?


Flash
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Old 08-16-2013, 08:38 AM   #15
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Well, what was it?

Flash
Actually we didnt know for sure.
The guy told me that he update the software in the ECU and they cleaned the o2 because we put new original mopar o2 and still the same codes.
So what they did and now the jeep runs better than ever.

Software update
Cleaned o2
Cleaned all the connections
Reflash.

An that was it.
But they told me, that if the MIL comes back on i will need to change the complete ECU because it wasn't reading the two upstream o2s

So far 700miles and still no mil.
Hope that was the problem

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