I run across a pretty good deal on a high flow cat-convertor for my 98 Tacoma. Direct bolt on Magnaflow. The same time I put the new cat on, I changed out both of the O2 sensors since one of em was wore out and throwing a code.
Now the check engine light comes on, stays on a day or so, and cuts back off. Its been doing that since I put the new cat and sensors on. I finally had a chance to have it scanned and they told me it was a P0420 code. Said it might be the cat convertor.
The truck doesn't run bad though and I can't really tell a difference in the old cat and the new one. Would it be a good idea to slap the old one back in just to keep the light from coming on or do you think the code might be be something more?