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2004 tundra p0420 bank 1 code - 2002 Toyota Sienna

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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CMV9
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SOURCE: Pulled code p0420 on 99 chevy astro, 2wd, v6

from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter

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.

causes

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
possible soloutions

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.


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Posted on Aug 20, 2009

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SOURCE: I have a P0420 code catalyst efficiency below

it is a bad converter not o 2 sensor i would change the cat and both o 2 sensors

Posted on Mar 09, 2009

  • 77 Answers

SOURCE: Getting DTC code P0404 and P0420. What should I do?

The 420 will not go away with egr replacement. it means the computer has detected a problem with the catalytic converter. eGR valve is at the rear of the engine. Not easy to get to on vans.

Posted on May 06, 2009

crapiemael
  • 241 Answers

SOURCE: p0051 code, where is the sensor located, where is

Bank 2 is passenger side, sensor 1 is the one up closest to the exhaust manifold. Plug in type (just remove old and plug back into the wiring harness connector) is about $90 at Autozone. You can get a cheaper one that you splice but it's confusing to understand which wires to splice together. Don't forget to buy the special socket, $10, to remove and install the sensor. It's split up the side for the wires. Forget trying to use an open end wrench, socket is best.

Posted on Nov 18, 2009

  • 184 Answers

SOURCE: received fault codes P0420 and P1296 catalyst

Not sure on the P1296 code, however in 95% of the cases the P0420 code means the catalytic converter is bad. See P0420 and P0420.com

Posted on Feb 11, 2010

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1 Answer

What is the P0420 code on my 2004 toyota tundra


the P0420 CODE IS INSUFFICIENT CATALYTIC FLOW , FIRST CHECK OTHER SENSORS BEFORE REPLACING THE CATALYTIC CONVERTOR, CHECK YOU REAR OXYGEN SENSOR TO MAKE SURE IT IS WORKING FINE, THEN CHECK YOUR EGR VALVE, MAKE SURE IT IS NOT LEAKING, CHECK YOU MASS AIR FLOW METER IF IT HAS ONE OR AIR FUEL RATIO SENSOR, THIS WILL BE THE TOP OXYGEN SENSOR. IF ALL GOOD THE CAT IS THE PROBLEM, THAT IS THE TOP CAT.

May 09, 2014 | 2000 Toyota Tundra

2 Answers

Engine light stays on, code is p0420 low thresh bank 1.... where is bank 1 located


I'm not sure you understand the difinition of OBD2 fault code P0420, it means that Catalytic converter in the exhaust that is connected to the engine cylinder bank that contains number one engine cylinder has fallen below the a allowed threshold of cleaning pollunts from the engines exhaust stream. I would be more specific but you have not given model or year of the Mercury you have.
Here is the full difinition of OBD2 fault code P0420 from the factory service information system.


P0420 - Catalyst System Efficiency Below Threshold (Bank 1)


Possible causes - Three way catalyst converter worn out
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module

Jun 07, 2011 | Mercury Cougar Cars & Trucks

1 Answer

Code reading p0420 bank 1 on 2006 lincoln navigator. which one is bank 1/


bank 1 is the side were the #1 cylinder is. po420 catylist below threshold ( bank 1 ). if your check engine light is on for a P0420 code( bad converter ) and you decide not to fix it, another more serious code could be triggered and you'd never know. it could the back 02 sensor also, behind convertor. have a mechanic check it out.

Mar 20, 2011 | 2006 Lincoln Navigator

1 Answer

Service engine light on then off code saying bank 1 bank 2 what does this mean and what can i do to fix it thank you mrs. mayers


There should be a specific code. A "P" followed by four digits, for example P0420. I will have a better idea of how to answer you question with the code provided.

Banks refer to the left or right side of the motor. Bank 1 will always be the same side of the motor and the number 1 cylinder. On a V-6 or V-8 bank 2 will be the opposite side of the motor. Inline 4 cylinders, 5 cylinders or 6 cylinders will only have a bank 1.

Mar 04, 2011 | 2004 Mitsubishi Galant

2 Answers

I got a diagnostic test and came up code p0420. what should i do to fix the code for it to pass ommissions test?


Replace the 02 sensor bank 1. Although there was a service bulletin for your year car. Ask your dealer about it. Also might be covered under warranty

Mar 02, 2011 | 2004 Mazda RX-8

1 Answer

I am a master tech for a gm dealership. I have dealt with many domestic driveability issues, however I drive a 2003 tundra 4.7 v8. While I take some grief from my fellow employee's, I drive the toyota...


#1 When you replace 02 sensors you should always replace all of them. Otherwise the new 02 sensor will be returning its Data back to the computer faster than the other old ones and this in itself may cause problems. #2 the P0420 indicates that the Catalysts System Efficiency is below the threshold on bank #1 And yes put in all new sensors and that means bank 1 sensor #2 as well. And then if the P0420 code returns replace the Catalatic converter on Bank#1.Please let me know the results. Good Luck and have a good XMASS.

Dec 15, 2010 | Toyota Tundra Cars & Trucks

2 Answers

2001 Toyota Sequoia is showing a P0505 and PO420 error code; how do you correct these issues.


P0505 Idle Control System Malfunction

IACV or Idle Air Control Valve if equipped is malfunctioning.

P0420 Catalyst System Efficiency Below Threshold (Bank #1)
The Catalytic converter is not working up to par in Bank#1.

I think this will point you in the right direction..



Jul 16, 2010 | 2001 Toyota Sequoia

2 Answers

P0051 code, where is the sensor located, where is bank 2 sensor 1 located on truck, 2003 4.7 engine, tundra truck


Bank 2 is passenger side, sensor 1 is the one up closest to the exhaust manifold. Plug in type (just remove old and plug back into the wiring harness connector) is about $90 at Autozone. You can get a cheaper one that you splice but it's confusing to understand which wires to splice together. Don't forget to buy the special socket, $10, to remove and install the sensor. It's split up the side for the wires. Forget trying to use an open end wrench, socket is best.

Oct 06, 2009 | 2004 Toyota Tundra

1 Answer

3 codes present on my 2002 Envoy. p0172, p0420, and p0340,


Track the p0340 first camshaft timing is very important and could possibly cayse your other codes,Call your local GMC dealer I think I remember a bulletin about this code.

Aug 21, 2009 | 2004 GMC Envoy

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