1999 Toyota 4Runner Q&A

1999 Toyota 4Runner Question: How do I ready the Cat. Conv. readiness monitor? I tried a drive cycle...

I looked up the drive cycle to activate or "ready" the monitor. I took it out today, and it doesn't seem to work. I changed the O2 sensor a month ago, driven it hundreds of miles, city/highway. When I plug in my scanner, all the monitors are "ready" but just not the cat... -
Answer 1
Possible cat problem! -