Quote:
Originally Posted by steve99
Tunes for catless headers will disable the P0420 cel code for cat efficiency and you wont trigger cel light.
However no tune system i am aware of even ecutek, will bypass or set the readyness checks to good, this is a separate piece of code in ecu
So even though you wont get cel the readyness check for front cat will still show fail
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Which is the best way?
Flash stock tune the moment before got inspected?