2003 GS430 I need a suggestion/help, so I reticently replaced the passenger side cat and the code was P0430 so I drove it around for about 2 day's and a P0156 code popped up and I replaced it with an oe o2 sensor and I drove it for about another 2 day's and again the P0156 popped up, what next step should I do?


Thanks again in advance.

 

Which 02 sensor did you replace?

https://www.clublexus.com/forums/gs-...n-sensors.html

 

Bank 2 sensor 2

 

Fixed it one of the flanges had a hairline crack and replaced it, also gasket as well to be in the safe side.