Question about 2007 Lexus GX470

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PLEAS WHAT ARE SOLUTION FOR THES CODE: P0420, P0430, P043E, P043F, P2401, P2402, P2419

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Posted on Jan 02, 2017

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SOURCE: drive and idle is normal

ok lets do this in order
P0420 Catalyst System Efficiency Below Threshold (Bank 1) an o2 sensor bad usually before the Cat converter P0430 Catalyst System Efficiency Below Threshold (Bank 2) same thing but the sensor after the cat converter the c1734 people will say you need to replace a bad BCM, but don't,, once the O2 sensor problem is addressed , that code will clear , it has to do with the remote start b2090 has to do with power doors ,, this will drop off too once the system is rest , same with the last one you listed, If I was you I'd have the 2 O2 sensors checked, replace the bad one, or both, and have the mechanic clear all the codes, then recheck them

Posted on Aug 11, 2011


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P0446 code

Ok code PO446 is your vehicles EVAPORATIVE EMISSIONS SYSTEM the most common cause is the gas cap gor left offf and someone drove the car or the cap was not fully locked it will set the code
the other causes are leaking evaporative emission plumbing from the fuel tank to the engine compartment, someone changed the fuel pump and did not seal it properly,
Failure of a emission component in the evap system
The only way to diagnost these is an OBDII scan tool and a smoke machine the light will come on when the computer does its test of the system and there is a hole as small as .020"
1/20,000 of an inch !
The light can only be turned off by a OBDII scan tool

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