Code p0420 cat efficency
So when I first bought my jk the check engine light was on with cat efficiency bank 1 code and high voltage downstream o2 sensor. I thought they must be related and the o2 sensor was causing a problem with a stuffed reading between the upstream and downstream o2 sensors causing the cat efficency problem.
Anyway having changed both downstream o2 sensors I now only have p0420 for cat efficency code. If I clear it, it comes back with in 50 kms.
Question is, has anyone come across this problem? Do I take it to the dealer to get the cat looked at, or just keep driving it? Or should I try and change an upstream sensor too?
Economy and power are fine.
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