It is part of the vehicle emissions system. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. The downstream O2 sensor reading should be fairly steady. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The catalytic converter has an oxygen sensor in front and behind it. P0420 OBD-II Trouble Code Technical DescriptionĬatalyst System Efficiency Below Threshold (Bank 1) You have four catalytic converters, and the one that is giving you trouble is cat#1, the one on the passenger side.īefore you purchase, read this description of the trouble code. This video can help us see if the cats are bad Obviously they have not done exhaust work to realize how many cats go to a vehicle. First of all, I would stay away from that local repair shop.
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