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Posted on Jan 02, 2017
The codes are Catalyst System Efficiency Below Threshold (Bank 1)&(Bank 2).
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
A code P0420 may mean that one or more of the following has happened:
Posted on Oct 06, 2009
Clean your mass air flow sensor with electrical contact cleaner. It's located between your air box and intake when it gets dirty it tricks your car into thinking it's getting less air than it is
Posted on Mar 20, 2011
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