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.