Question about 1999 Toyota Corolla
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.
Symptoms You will likely not notice any drivability problems, although there may be symptoms.
Causes A code P0420 may mean that one or more of the following has happened:
Posted on May 26, 2011
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Posted on Jan 02, 2017
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