2005 Jeep Grand Cherokee - 5.7L Hemi Code P0420

[RON169]

I HAVE AN 05 JEEP GRAND CHEROKEE LIMITED THAT IS DRIVING ME CRAZY.

THANK YOU FOR ALL YOUR HELP BUT THE CUSTOMER PULLED THE CAR.I WAS LOOKING FORWARD TO SOLVE THIS ONE.THANKS RON.

[JBUTITTA]

Sounds like you may have a bad catalytic converter and torque converter (not uncommon on this vehicle). jerry

[brianp87]

Both issues are seperate test the cat

[steven kiser]

welcome to the forum. using the scanner check the balance between the front and rear 02's.if it's close replace the cat. i also use the rattle test. when the exhaust is cold shale it. if it rattles the cat's junk. i use an infrared temp gun to check the cat. it sounds like a converter issue. i suggest you only use o.e.m.

[Tim Martin]

at that kind of mileage, the cat is out a business. The cat monitor should be about 1/2 of the front o2 sensor.