Question about Cadillac CTS
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Posted on Jan 02, 2017
Failed or faulty oxygen sensor, or faulty catalytic converter. It's actually the oxygen sensor reading that the catalytic converter is not functioning properly & needs relacement. That's provided the oxygen sensor is not faulty, which personally, I'd go for that first.
Both would explain excessive fuel usage.
Posted on Jan 25, 2009
SOURCE: code p0430 p0420
there is a update for the engine computer if you take it in to your toyota dealer they can do it for you. there is a campaign on this issue so its free of charge
Posted on Apr 27, 2009
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
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