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My 2002 toyota camry throw P0420 after i fill the gas, start

Customer Question
my 2002 toyota camry throw...
my 2002 toyota camry throw P0420 after i fill the gas
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: start as usual
JA: Are you fixing your Camry yourself? What have you tried so far?
Customer: tried changing the gas cap did not help
JA: Anything else you want the mechanic to know before I connect you?
Customer: my mechanic told nothing wrong with CAT needs tuneing
Submitted: 5 months ago.Category: Toyota
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Answered in 5 minutes by:
6/15/2017
Toyota Mechanic: Gary, Technician replied 5 months ago
Gary
Gary, Technician
Category: Toyota
Satisfied Customers: 17,266
Experience: GM master tech for 15 years/ASE master tech for 20 years
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.

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Toyota Mechanic: Gary, Technician replied 5 months ago

is that the only code set ?

how does it run ?

your sure its a P0420 code only set ?

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Customer reply replied 5 months ago
Car run fine, P0420 is the only code set
Toyota Mechanic: Gary, Technician replied 5 months ago

ok the 420 code is a cat converter efficiency code set

this codes is set by either bad O2 sensors or a bad cat converter

nothing else will set this code

a shop has to read what the 02 sensors are reading and if reading wrong replace them if they are reading right the cat converter must be replaced to correct this code i am sorry to say

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Customer reply replied 5 months ago
CEL comes on after filling the gas (driving few miles) , if i clear the code it will not come again till i fill the gas again
Toyota Mechanic: Gary, Technician replied 5 months ago

the only thing to set a 420 code is the cat converter not converting the exhaust

please dont forget to rate me here at Justanswer

you can always get me back for FREE for any follow up any time with this question even after you rate me here at Justanswer

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Gary
Gary
Gary, Technician
Category: Toyota
Satisfied Customers: 17,266
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Experience: GM master tech for 15 years/ASE master tech for 20 years

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