civicturbocharger Posted August 23, 2007 Share Posted August 23, 2007 What is bank 1? is that the cat? or the O2 sensor??? This is a 99 si civic with the obd 0 block..P0170: Fuel trim malfunction (bank1) P0172: system to rich ( bank1) what is wrong? Im thinking it the O2 sensor.... If anyone know any advice plz.. help.. Link to comment Share on other sites More sharing options...
SEPA Ride Posted August 30, 2007 Share Posted August 30, 2007 I'm throwing the same codes in my 98 Lude Sh and I know it's because i need a cat. My mech. said it could be either or cat or O2 sensor. Link to comment Share on other sites More sharing options...
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