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My toyota sienna 2004 v6 3.3l have code po420 any po430

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

bschilz
  • 2049 Answers

SOURCE: how to repair po420 code on a 2002 toyota sienna

The P0420 code is Catalyst System Efficiency Below Threshold (Bank 1) error.
A code P0420 may mean that one or more of the following has happened:

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers
offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


Posted on Oct 26, 2009

  • 1 Answer

SOURCE: Toyota Sienna 2004 Headlight Problem

If you have the HID bulbs, and there is moisture in the bottom of the assembly, the high voltage box at the bottom will not work. this requires removing the whole headlamp, removing the circuit board from the bottom and drying out. I have done mine twice before finally finding how water was getting in at the top seam of the lamp assembly. You will have to dis-assemble part of the wheel well and bumper cover to gain access to all the mounting bolts. Best of luck

Posted on May 02, 2010

c17hydro
  • 2984 Answers

SOURCE: 1997 toyota camry check engine light on,code po440,po420,po441,

P0420 is catalyst system efficiency below threshold (bank 1)

P0440 is evaporative emission control system malfunction

P0441 is evaporative emission control system incorrect purge flow

Posted on Mar 29, 2009

  • 225 Answers

SOURCE: 2004 Toyota Sienna code P0430, Catalyst system

7 out of 10 times that means that one of the cat's have gone bad. Most of the time it happens when your mileage is around 100,000 miles. The only thing is to do is to change the bad cat.

Posted on Aug 30, 2009

ftw1952
  • 10319 Answers

SOURCE: my 01 toyota sienna has check engine light on code

If you think the catylist is ok check your 02 sensor instead. P0420 is about the convertor and maybe water got in your tank fron filling it at a fuel stop with low reserves in their tank. They all do have water in their tanks. If you like fill your tank and the disconnect your battery for 15 minutes. reconnect it and drive the car 50 miles or more on the highway. This may clear your codes out

Posted on Jan 23, 2010

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1 Answer

Code po430


PO420 right exhaust converter failed
PO430 left exhaust converter failed
You can Google any codes you get & study/learn
whatever
The converter should last closer to 15 years ,so I suspect
the motor hasn't run well for some parts of it's lifetime
Too much fuel & cylinder misfires ruin converters
This is a growing problem as people just never work on
vehicles any more until they break down.
The new technology of the last 30 years won't compensate
for that,in fact they require a lot of checking over at least 3 times
a year.

Aug 08, 2013 | 2001 Lexus IS 300

1 Answer

Po430 error code what is it


Code 430 is for a problem with the catalytic converter on bank two.
It means the computer can not tell if the cat is working or not based on the readings from the O2 sensors.
The sensors and the cat would need to be tested.

Jan 09, 2013 | 2004 Toyota Sienna

1 Answer

How to remove 2004 sienna radiator


I have written step-by-step instructions on how to replace the radiator in a 2004-2007 Toyota Sienna, including removing the bumper: John Fixes Stuff How to Replace the Radiator on 2004 2007 Toyota Sienna

Apr 03, 2012 | 2004 Toyota Sienna

1 Answer

What do these codes mean ? po430 po420 po306 for mercury cougar 1999


P0430 code is(catalyst efficiency below threshold on bank 2)
P0420 code is((catalyst efficiency below threshold on bank 1)
P0306 code is(cylinder 6 misfire detected)

Dec 13, 2011 | 1999 Mercury Cougar

1 Answer

2003 lincoln ls what does the codes 420 and 430 mean


PO420--Catalyst System Efficiency Below Threshold (Bank1)
PO430-- " " " " " (Bank2)


O2 Sensor
Coolant Temp Sensor
High Fuel Pressure
Bad Converter
Thermostat
Etc

Owning a 2004 V8 myself--I will say your need to go thru the entire engine, as to how it is running
It may be overheating due to coil misfires or other issues and ruined the
converter

You need to solve all issues before replacing a converter
I would stay far away from a dealer, unless you have a couple thousand to spend

Nov 02, 2010 | 2004 Lincoln LS

2 Answers

Got a po420 and po430 in my 04 nissan titan. im tired of guessing. any help?


i have the same problem with mine and endit up being the trio cat mufflers under the vehicle
hope solve the problem if not tel me what happend bye
carlos

Oct 04, 2010 | 2005 Nissan Armada

1 Answer

Po420 bank 1 and po430 bank 2 error codes


sounds like O2 sensors to me. I havent changed one on a mustang yet but I havent had any trouble with any others that I have done, they screw in like a spark plug but you will need a special tool, I hope this helps you.

May 13, 2010 | 2007 Ford Mustang GT California Special...

2 Answers

Po420 on my 2001 sienna


P0420=Catalyst System Efficiency Below Threshold Bank 1,
The air filter is not the cause here,this is just a code saying your converter is not doing its best,

Jan 26, 2010 | 2001 Toyota Sienna

1 Answer

How do i fix code po420 & po430 on 2003 jaguar


Both these codes relate to Catalyst efficiency below threshold on banks 1+2. This is normally caused by a combustion fault. This fault may be shown due to a faulty sensor in either air imput or exhaust systems, Get the memory read at a dealers or good garage. If you had a serious problem the car would not drive well.
Hope this helps - good luck.

May 09, 2009 | 2003 Jaguar S-Type

1 Answer

98 silverado codes po420,po430,po446


if the cat was pluggin you would see this as your going down the road it would not get to top speed .. They act up usually only run 40 top speed.

Apr 12, 2009 | 1999 Chevrolet Silverado 1500

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