29f4 is a catalytic conversion efficiency code. Not, necessarily an O2 sensor bad code.


Keep in mind that O2 sensors are a maintenance item. If they are suspect, I tend to replace. Pre-cat. Less of an issue w post cat sensors, they see far less abuse. Id replace both precats



There are some good youtubes on diagnosing these- looking at the actual O2 sensor readings to try and discern whats up. A way to 'test' them.



Ya get over to great sandy at all? Good times there years ago.

And for others, 'crook' is aussie for 'gone bad'.