Question about 2006 Toyota Sienna

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I have a 2006 toyota sienna giving me three trouble codes: c1241, p0420, p0430. What do they mean and how do they relate? What is the best repair solution?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

frcs68
  • 1605 Answers

SOURCE: Repair Codes - B2796, P0750 and P0420.

B2796 is no communication in Immobiliser system, which means you or some one else try to use a key transponder to start the car.
you need some one to clear that code. it doen't affect the car performance.
P0750 is shift Solenoid malfunction, you hsould have engine management light on the dash. this you can call the dealer, I believe this is cover by Toyota service bulletin.
http://www.mediafire.com/?jjmootmytfz
P0420 is O2 oxygen sensors.Toyota has issued a service bulletin regarding the P0420 trouble code that could apply to your vehicle, to be sure if this bulletin applies to your car I will need the VIN# and e-mail to tedrttr@yahoo.com with that information.

Posted on May 19, 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

  • 1 Answer

SOURCE: Replacing RH Side view mirror on a 2006 Toyota Sienna

I had to replace my passenger side mirror on my 2004 Sienna a while back. I took some pictures as I did it. Maybe this can help.http://time4nothing.blogspot.com/2008/03/fixing-04-sienna-passenger-side-mirror.html

Posted on Oct 04, 2009

  • 1 Answer

SOURCE: Ck. Engine P0420 & P0430

engine code p0430 for 2005 toyota sienna

Posted on Dec 30, 2009

  • 1861 Answers

SOURCE: check engine lite,code p0430 for a 2005 toyota

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

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Car sometimes will not start after sits for a day


Definition of Diagnostic Trouble Code P0420 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 1Note: This definition of P0420 is applied to all manufacturers

Definition of Diagnostic Trouble Code P0430 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 2Note: This definition of P0430 is applied to all manufacturers

As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.

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Sir,help me I have 2004 Toyota sienna van XLE ..my engine light was . c1201 ,c1223, c1224, u0123 u0124 u0126 P0430 P0420 Thanks Mr felix


c1223 Malfunction in ABS control system
c1201 Brake Boost Sensor Circuit Range/Performance
c1224 Open or short circuit in NE signal circuit
u0123 Lost Communication With Yaw Rate Sensor Module
u0124 Lost Communication With Lateral Acceleration Sensor Module
u0126 Lost Communication With Steering Angle Sensor Module
p0430 Catalyst System Efficiency Below Threshold Bank 2
p0420 Catalyst System Efficiency Below Threshold Bank 1

you have major problems is it worth fixing???,its gonna be quite a bit

Jun 02, 2015 | Toyota Cars & Trucks

1 Answer

2001 Toyota Sienna CEL displayed code P1150 & P0420 what could be the problem


Mine is a 2001 Sienna LE. I got the P0420 code and the dealer want to replace an engine control computer for $1600. I've found posts that say you can replace your oxygen sensors, which still costs around $100 each. The P0420 seems to be emissions related. When my check engine light comes on, I run the highest grade, no ethanol gas, and usually within a couple of tanks, the light goes off again. The last time it happened about 2 wks ago, I put in the 93 octane no ethanol premium and a can of Seafoam and within a half a tank, the light went out. Your problem might be more serious, and I don't know what the 1150 code is, but so far that's worked for me.

May 17, 2012 | 2001 Toyota Sienna

2 Answers

My 1999 Chev Tahoe will not start - Has codes p0430 and p0420


Hi Charlie,
Diagnostic Test Codes (DTCs) P0420 and P0430 ar "Catalyst Efficiency" codes. These simply mean that the catalytic converters in your vehicle are not performing the way they should be. To fix these codes, you will most likely have to replace the converters. However, these codes do NOT indicate why your engine wil not start. There are many things that can cause an engine to not start. Many of which may or may not set fault codes. You need to determine if the engine is getting fuel and ignition first then go from there.

Dec 17, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

P0420 and p0430 faults no others comes back 20 miles of driving?


this obd2 trouble code table can help you understand the meaning of code.
and for the p0420, you can try :

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.

for p0430, try:

.

First, inspect for exhaust leaks.

Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen o2 sensor while you're at it.

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.

Aug 17, 2011 | Toyota Tacoma Cars & Trucks

1 Answer

Ck. Engine P0420 & P0430


engine code p0430 for 2005 toyota sienna

Nov 25, 2009 | Toyota RAV4 Cars & Trucks

2 Answers

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.


Oct 26, 2009 | 2002 Toyota Sienna

2 Answers

P0420 & P0430 codes 99 silverado


codes p0420 and p0430 are both post o2 sensors, the ones after the convertor, both sides if replacing

May 17, 2009 | 1999 Chevrolet Silverado 1500

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