PO420 code
 

My jeep cel came on yesterday so I used my flashpaq to check and reset the light. I called the dealer because it is still under federal emissions warrenty.They are ordering a new catalytic converter.Has anyone had this problem. By the way its an 07 with 33000 miles.

Yep had it done at 48,000 have them replace the censors too! All 4 of them.

MY check engine light just came on. I don't have a flashpaq. How I check it without going to the dealer. (I hope).

1. To check your Jeep JK Wrangler’s DTC codes, simply insert your key into the ignition, turn it to the ‘ON’ position but do not start the engine. Then, push the key into the ignition cylinder and while holding it in, turn it to the ‘OFF’ position and then back to the ‘ON’ position (3) times straight making sure to end with it in the ‘ON’ position. It is important to keep pushing in on the key to prevent it from catching at the different positions along the way.
2. If you do step #1 correctly, all your dash lights will illuminate and your odometer will show up as a series of (6) dashes. If your Jeep JK Wrangler has logged any DTC’s, they will be displayed soon after the dashes appear. Write down the DTC(s).
3. If your Jeep JK Wrangler has not logged any DTC’s, the dashes on your odometer will be followed by the message ‘-done-’. Turn your key to the ‘OFF’ position and you will in fact be done.

sure have but i had to jump through way more hoops. first had 2 O2 sensors replaced. then the PCM then the same 2 O2 sensors. then the other 2 O2 sensors before they finally agreed with me that it was the catalytic convertor. $300 and at least 12 days of going with out a jeep over a 9 month period about did me in. glad to hear they went right to yours though. btw i have an 08 with 77k on it

good info thanks for posting this...
:thumbsup:

They had already changed the 4 o2 sensors and pcm about 1 1/2 year ago so maybe thats why they're going straight to the cats