Michael robinson Posted May 18, 2011 Share Posted May 18, 2011 hi yesterday my engine light came on and I tested it with the obd2 fault code reader it's coming up with P0420 Catalyst System Efficiency Below Threshold (Bank 1) I was just wondering if there's any way I can test weather it's my cat or the sensor ? Av just bought new hfc's from Tarmac so I can change my cat's , but if i could test the sensors to find out if the sensors are nackered before putting the hfc's in it would save me an labour changing them all together . Cheers Quote Link to comment Share on other sites More sharing options...
Zugara Posted May 18, 2011 Share Posted May 18, 2011 Swap them over, see if you get a fault code for bank 2. Quote Link to comment Share on other sites More sharing options...
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