I know this is my first post but for months I have been reading every post on multiple forums to resolve my CAT monitor not ready problem. While I found many people with the same problem I couldn't find anyone that posted how they resolved the problem. I felt it my duty to post what worked for me to possibly help someone in the future.
The back story is I bought a 99 jeep wrangler 4.0 auto with 85k miles from a gentleman that lived in an area that does not require emissions testing 3 years ago. When I bought the jeep I could not get plates right away because the CAT monitor was not ready. After a bunch of work to it, new 02 sensors,new CAT and new muffler it would still not ready. Many phone calls later I convinced them to sniff test me and it passed clean.
In Indiana we must test every 2 years, so my troubles began again. I new it was running clean so my attention turned to every possible drive cycle and trace I could find on the internet. I took it to a dealer and was told it was a PCM problem and nothing they could do because of it's age.
In a last ditch effort before I either sold it because I couldn't get plates or take it to an emissions shop and paid whatever I had to I tried one more thing.
I started the jeep and let it warm up, shut the jeep off for 10 seconds as per one of the drive cycles I've read (don't know if this is needed but what I did). Then ran it down the highway for only about a mile and a half at 55 mph at 3,000 rpm. BOOM monitor ready. since it's an auto I had to keep it in second gear.
I don't know if this was a fluke, an act of God or a solved mystery drive cycle but it worked for me. I have no science behind it but I hope someone can use this information to ready their troublesome CAT monitor. Thank you to all that posted info I have used in the past.
The back story is I bought a 99 jeep wrangler 4.0 auto with 85k miles from a gentleman that lived in an area that does not require emissions testing 3 years ago. When I bought the jeep I could not get plates right away because the CAT monitor was not ready. After a bunch of work to it, new 02 sensors,new CAT and new muffler it would still not ready. Many phone calls later I convinced them to sniff test me and it passed clean.
In Indiana we must test every 2 years, so my troubles began again. I new it was running clean so my attention turned to every possible drive cycle and trace I could find on the internet. I took it to a dealer and was told it was a PCM problem and nothing they could do because of it's age.
In a last ditch effort before I either sold it because I couldn't get plates or take it to an emissions shop and paid whatever I had to I tried one more thing.
I started the jeep and let it warm up, shut the jeep off for 10 seconds as per one of the drive cycles I've read (don't know if this is needed but what I did). Then ran it down the highway for only about a mile and a half at 55 mph at 3,000 rpm. BOOM monitor ready. since it's an auto I had to keep it in second gear.
I don't know if this was a fluke, an act of God or a solved mystery drive cycle but it worked for me. I have no science behind it but I hope someone can use this information to ready their troublesome CAT monitor. Thank you to all that posted info I have used in the past.