2008 Jeep Commander 5.7 Hemi with P0153

[Go4x4it]

I could use some help with my 2008 Jeep Commander 5.7 Hemi with the P0153 code constantly coming on after less than 40kms of driving.

Since Oct 2011 I have been having the P0153 code coming up first as an occassional code which has now become a regular code which quickly reappears after clearing with my scanner. I never get to a Green status.

Dealers have emptied my pockets with eight visits changing all the O2 sensors and then the Bank 2 sensors a second time. Other work performed includes an after market Cat was installed, fresh plugs installed, throttle body cleaned, injectors cleaned, and exhaust manifold inspected. Finally swapped out the ECM computer and reloaded all the TSBs but that made no difference. I simply can't afford this kind of trouble shooting with shop labour $ guessing what is causing the P0153 code.

Eventually I was told by a smug dealer to spend more money by installing a new Mopar Cat, or trade it in or just ignore the light as the Jeep was running fine.

Truth is it is burning gas heavy at ~19L/100km or ~12mpg mainly on the highway even with me clearing the code regularly with my scanner. Clearing the code let's me get some MDS activiation but not much. Last week I took it in for an Emission Test to see if it was burning clean and the thirsty beast barely passed with the CO readings at .60 just under the .65 limit. Problem is in Ontario code issues will make you fail the emmissions test starting in 2013 which makes this issue more than just a gas hog problem.

I'm open to any ideas you may have as my 3 mechanics all admit that the cause remains unknown.

[rjhj]

Where abouts in ontario are of taking your jeep. Ive been to a bunch of dealers around the GTA and haven't come across any that I would recommend to use as a shop


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[07JeepXK]

I was always told aftermarket cats on our jeeps is a bad idea! Is that something the dealer swapped out??

[jthurstonjr]

i'm not sure what kind of mods you have (if any) but i average 20L per 100km

btw i'm not sure where in ontario you are but i'm in Burlington

[Go4x4it]

I'm just north of Toronto checking out Mechanics in the Vaughan area. I did have the Pickering Dealership look at the problem where they suggested exhaust manifold.

I followed up on this idea with a close local mechanic inspection. We dove right in with new parts ready and pulled out the wheel well cover and got the exhaust manifold heat shield off but stopped as there was no sign of leakage or passing exhaust.

[Go4x4it]

I changed the CAT as two times the P0430 was part of the stored codes and my local practical mechanic said this might help. Luckily I kept the OEM CAT as it looked fine and the muffler shop thought the upstream problem was not likely caused by the OEM CAT.

[Go4x4it]

Originally Posted by Go4x4it

I changed the CAT as two times the P0430 was part of the stored codes and my local practical mechanic said this might help. Luckily I kept the OEM CAT as it looked fine and the muffler shop thought the upstream problem was not likely caused by the OEM CAT.

My Engine MODs are limited to a Cold Air Intake K&N which was on the Hemi for 8 months before any codes started lighting up. About 4 months ago I ordered a new air filter to replace my original kit filter as I thought my cleaning my not be as effective as a new replacement. This made no difference but knocked one more possible cause off my long list of ideas as to why the P0143 code is constantly lighting up.

[Go4x4it]

Well it's 2013 now with the P0153 code coming on after 20kms of driving now. I'm beginning to think a rookie mechanic should find the problem now since it is regularly sending the P0153 fault code now. The dealer with $2K of my money has changed the PCM without success and thinks the wiring might be at fault or it could be an exhaust leak. I thought they checked both the wiring and exhaust system before replacing parts (PCM, Cat, 4 O2s) but clearly the profit is in parts replacement on the customers Visa. Again any help or ideas would be appreciated to solve this issue.

[Go4x4it]

I've been having an O2 Sensor code problem P0153 since Oct 2011 or for 16 months now which started when I had less than 110,000 km (emissions warranty).

How do you start a case with Jeep because my Dealer has no idea what to do as I refuse to pay anymore than the $2K spent to date.

[06hemixk]

Go to corporate. http://media.chrysler.com/newsreleas...id=9117&mid=18

Contacts on the side.