I have a 06 Ford F150 130k miles. I had an o2 code pop up I replace both. Then catalytic converter code popped up, so I replaced the converters. They have cleared the code and I have also cleared the code many times by unhooking the battery and it keeps coming back on. Spark plugs have been replaced at 115k. I need to replace the cops. It runs rough at idle at times. Thats bout it. The light drives me nuts. Any thoughts?????? Thanks.

 

What's the code you're getting, p0420?

 

Assuming you are getting a P0420 or 0430...

I have lived with this for a few years now...my understanding is these codes are tripped due to the switching frequency or rate between the front and rear O2 sensors...indicating a bad catalytic converter...if cat is bad rear sensor is changing frequently, when cat is good rear sensor doesn't change as fast...

I personally did the Gotts O2 mod with the spark plug non-fouler on my drivers side cat about 4K miles ago, and no codes...is the cat still bad...yup, just not seeing a check driver light...we will see if it passes smog in August...

Regards!

 

You need to post the exact code numbers you have been getting.

 

Yes P0420 P0430