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Old 01-16-2014, 11:25 PM   #1
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P0153 again!

Ok this is literally a small rock in my shoe right now but i don't want it to be a fly on my soup or a foot on my you should what i want to say.
Jeep rubicon 06 57k KM

last year i had this code while wheeling, it was the p0153 and another one but i can't remember but it was an exhaust leak detected.
so i did check all the exhaust bolts and the bank 2 header was very loose. to cut a long story short, that didn't solve the problem i took the jeep to the dealer they mess with the ECU and the wiring and the Mapping they said.
no replacement part needed only a glitch they said. but they warn me if the MIL came back on they would have to change the ECU and thats to much money!
one year after that means today i was driving and MIL came on.
same code just P0153. No noises nothing bad under the hood, at plain sight.
The only thing i do notice is when im in 3 to 6 gear and the rpms are between 1500-2000 for a fraction of a second if i accelerate sharply the engine seems to do nothing and then goes. its like a turbo lag but without the turbo.
i been having the same gas milage between 17-18 city and 20-22 highway.

i read in another web site that this is a frequent in a 05-06 because of the heater of the o2 not kicking in and the fix is quite complicated to hot wire some stuff and in short words to make a mess in the fuse box
i will put a link.

any ideas? bolts loose again? Ecu gone bad? what to do? and what to expect for

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Old 01-16-2014, 11:26 PM   #2
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Solution for 2005/06 TJ/LJ O2 Sensor Heater "not ready"

BTW i never mentioned. The owners manual says that if the jeep key is in the on position without the engine running the MIL should stay still and if it not it isn't ready for the emissions test or something like that.
my jeep always did blink well after 15 sec of course. not even after the last trip that was 1,000 km long in one day. so kinda weird isn't?

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Old 01-17-2014, 06:11 AM   #3
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Maybe all it needs is a new O2 sensor? That code popped up on me last week then a few days later the light went out. I replaced both upstream sensors with NTK sensors yesterday anyway. P0153 is the upstream sensor closest to the cab.

Edit: check the exhaust flange to manifold bolts, they could be loose and possibly be a contributing factor to your problem, if they are indeed loose.
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Old 01-17-2014, 06:45 PM   #4
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everything was ok. no carbon deposits at sight no noise i think there isn't an exhaust leak xP
what else to check any other ideas?
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Old 01-19-2014, 11:57 AM   #5
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I had the 0153 & replaced both upstream O2 sensors with Denso units (NOT Bosch) and haven't seen the CEL or code again.

NB - I had no symptoms aside from the CEL.

Replace the O2 sensors!
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Old 01-19-2014, 05:11 PM   #6
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Quote:
Originally Posted by bschurr View Post
I had the 0153 & replaced both upstream O2 sensors with Denso units (NOT Bosch) and haven't seen the CEL or code again. NB - I had no symptoms aside from the CEL. Replace the O2 sensors!
They are working perfectly fine!
I just check them with a obd2 advance diagnostic tool. And it seems they are working perfectly fine. All 4 of them quick response and stable readings.
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Old 01-19-2014, 05:23 PM   #7
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Update:
Well i had time to work with my dear tj so. This is what i found after i washed the engine.
1.- 1!!! Just one loose bolt!!!! And not so loose. It was the first one if the second headers so bank 2 pre cat bolts.
2.- i checked all the bolts of the headers all torqued to factory specs no one was loose and no sign of exhaust leak(btw one of the pictures looks like a exhaust like thats actually water i just cleaned up the engine so i could work)
3.- those 2 vacuum lines seem pretty loose no enough to make a vac leak but i did check all vacuum lines to make sure it wasn't a stupid vacuum leak.
4.- bank 2 sensor 2 the connection was about to break due to the faulty clamp that goes to the engine. So i fixed that with a new one and cleaned the connection.
5.- i cleaned all my air intake tube(just for fun) and also the throttle body nothing bad just for fun.
6.- i dont know where i read that the relay for the o2 sensor sometimes generates a loose connection so i cleaned all the relays and everything was normal.
7.- i disconnected the Bat for about 30min and reflashed the ECU.

And so far everything is working perfectly fine.
The little hesitation went away. And now purrs like a kitten.

If the problem comes again i will inform ok.
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