I just got a P0420 code (catalyst efficiency below threshold) and will have to do the O2 mechanical fix.

I may not be able to fix it in the near future, so my question is whether there are any problems or risks to driving around with this code? (I can clear the code with my scanner, but I'm sure it will come back.)

 

no, nothings wrong with driving with it on i had it for a good amount of time before i found out how to do the spark plug anti-fouler fix.

 

Great, thanks.

 

just don't let you cat get clogged. it can cause excess heat build up and ruin the turbo.

 

you have a test pipe im assuming right? only thing youd have to worry about is you wont pass inspection until you either delete the code or get the fix

 

...if ams tuned it.. why didnt then mod your rom for you..

 

this is the smartest way to do it.. the defouler trick works good though.

 

what would they mod? can you take out the o2 sensors wit ecuflash?

 

You can remove the rear one via a simulator. Which also removes that code....

 

agghggghh! no - you can set the rom to always show the catalyst system is working correctly... this is done by modifying the SOFTWARE. NOT BY adding electronics gizmos!

 

.. at what point did i mention electronics?

 

simulators = electronics.

 

the original code was referred to a rear 02 simulator, or sometimes patch.

 

I have a HFC. And I was tuned at AMS a long time before the code appeared, so there was nothing to correct at that point.