Question about Lexus LS 400
Engine check lite is on with the code P0430
Posted by Anonymous on
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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
Hello. Your P-0420-code is most likely due to a bad Air-Fuel sensor; Bank one, Sensor one. This sensor is on the exhaust manifold, closest to the firewall.
We would recommend replacing this sensor.
Note: Please use a genuine Toyota sensor; the aftermarket sensors do not deliver the correct voltage to the computer. If you purchase an aftermarket sensor, your problem will not be corrected; we see this quite often in our service department.
We hope that this helps you out.-
Posted on Dec 30, 2009
Testimonial: "thank you,you've been very helpful."
P0430 Catalyst System Efficiency Below Threshold (Bank 2)
P0441 Evaporative Emission Control System Incorrect Purge Flow
with p0441 did you replace the gas cap on all the way? that will cause this code every time. and or have you ever replaced the gas cap?
Posted on Apr 15, 2010
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