Question about Cars & Trucks

1 Answer

2003 toyota matrix with code po420

Code po420 but cat is functioning according to smog paper work, cleaned air flow meter with correct cleaner, checked 02 sensor data, found sensors switching, did not check sensors while vehicle was cold, test drove vehicle and code returned first drive cycle. i was told i needed to replace cat and than told to replace the air flow meter please any info would be appreciated thanks

Posted by on

1 Answer

You don't check O2 Sensors when cold,
they won't be operating or switching until
the computer goes into closed loop & converter
lights off at 600 degrees & continues to hopefully
around 900 to 1,100 degrees
Other than replacing a sensor, the only real
test I found of any value, is to watch switching
times on an oscilloscope
You can, as you said, look at scan tool data
Giving your vehicle is a 2003 & converters last
12 to 14 years, you know yours is worn out,doesn't
matter what the inspection gas results were & with
any codes, you should have been rejected & not tested
If you check fuel trim,you will see how well the MAF Sensor
is doing & you can't adjust fuel if the converter is not capable
of holding oxygen for the sensors to read
The front O2's get replaced on all vehicles at 100,000
when or before they slow down & fail

Posted on Jul 10, 2013

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

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

mrgreenz
  • 962 Answers

SOURCE: the code PO420 came on for my 2000 Toyota Camray ......

Catalyst Effeciancy below threshold (Bank 1) is the code meaning. Check or replace the oxygen sensors. Some cars have 2 .One is on the front of the cat. the other is the on the back. Check the back sensor . Other possible causes are leaking or damaged exhaust manifold, bad coolant temp sensor.If toyota did not replace both . replace the one on the back of the Caty.

Posted on Feb 02, 2009

  • 77 Answers

SOURCE: fault code po420 ; is problem sensors or is it the cat conv

The only thing that will set this code is the catalytic converter or the oxygen sensor behind it. Way to tell if it is the sensor is to monitor voltage reading with scan tool and see if it is fluctuating the same as the upstream oxygen sensor. If it is the converter is "free flowing" and will have to be replaced. If the sensor is "flatlined" then it is most likely bad and setting the code.

Posted on Apr 30, 2009

  • 1 Answer

SOURCE: 2003 Toyota Camry Se V6 has a check engine light

I had the same problem, then took my car to an expert repair shop who diagnosed the sensors and
found no problem with the car. They notified the DMV who was unaware of the problem, who then told the repair shop (John's Bascom Automotive) that they will adjust their computer system to allow a "two speed idle test". My bill was $95 and I still have to pay for a smog test after driving around for
a couple of days to clear the computer monitors, a fair amount and I gladly paid it.

John advised me that I'd get no satisfaction with Toyota or the DMV. I went to the dealership where I
bought the car and they said that the smog stations don't know what they're doing. They charge
about $100 and work around the P0500 code but it takes them about two hours to do this. I told
them that I should have been notified about the dyno none-compatability by Toyota and that Toyota
should have notified the DMV beforehand. I wonder how many speed sensors are being replaced by
unknowing smog shops around the state. I got Toyota's main customer support phone number and
will call them Monday. I'm going to get my pound of flesh ($95 worth) from the DMV next week also.

traderralph

Posted on Jun 26, 2009

  • 75 Answers

SOURCE: 1998 Ford Explorer v- 6 OHV Check engine light

OK. Since you have had so much trouble lets check the dealer for an updated software calibration for the PCM (power train control module). Once we're sure there is no "fix" here lets talk about "lean" engine conditions. Lean means one of two things are wrong with the air fuel mixture (ideally 14.7 parts air to 1 part fuel). 1. Too much air -or- 2. Not enough fuel. If you access to a scan tool we need to look at fuel trims. With the engine warm look at this data on the scan tool. You have a "bank 1" and "bank 2" fuel trim data. Additionally, each bank has a long term and a short term value. With the Engine hot and at idle add the LT and ST trim value for bank1 and write it down...do the same for bank2. Repeat this step, for EACH bank with engine at 2500 RPM in park (hold at 2500 for at least 30 seconds so trims update). Now, you have the total trim values for each bank at idle and at 2500 RPM. What should the values be? Total trim +/- 5 is good, +/- 10 borderline any thing greater is code setting territory. If trim numbers are high at idle and in range at 2500 rpm you have a vacum leak behind the mass air flow sensor. Or a faulty MAF. Pay particular attention to the air inlet hose clamps behind (between MAF and engine) the MAF. Also use ford parts only.

Posted on Nov 14, 2009

steve_e_uk
  • 1675 Answers

SOURCE: I have P0770 code on my 2003 Toyota Matrix 2WD

First I would try resetting the ECU by disconnecting the battery for a few minutes. This will remove the code. Then see if it comes back. Mind you you will not pass inspection, because the ECU will need to monitor a certain amount of driving "cycles" before inspection will accept the findings. Before that, replace your O2 sensors, and get those out of the way. P0770 is a Shift Solenoid E Malfunction. You will have to look at a manual to find out which Shift Solenoid that "E" refers to and where it is located. TC lockup, refers to the TC lockup solenoid. If so I would try replacing that and going from there. The auto transmission is a pretty complicated beast, and even the most experienced DIY'ers would go past the normal maintenance. HOWEVER, changing solenoids is considered, at least to me, DIY maintenance. Whats is your RPM when cruising at say 60 mph. If its more than 2400 rpms, then i would say it is your lockup solenoid. hope this helps

Posted on May 31, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Where is bank 1 02 sensor located on 2003 Toyota matrix


Hello, there are two sensors, one is the air/fuel ratio sensor which is in the pipe between the exhaust manifold and the catalytic converter and the oxygen sensor which behind the cat converter in the exhaust pipe, The most common fault is the front sensor but it depends on what the diagnostic code number is to be more specific.

Dec 03, 2014 | 2003 Toyota Matrix

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

1 Answer

Where are the O2 sensors? I found one directly behing the spark plugs on the back.


The O2 sensor (2 on V engines) are in the exhaust system pipes before the catalytic converter, the next sensor is the efficiency monitor for the catalytic converter system it looks like a O2 sensor but performs a much different function as far as testing goes. The codes you have follow.

P0420 - Catalyst System Efficiency Below Threshold Bank 1
What does this mean? In most cases it means the catalytic converter is worn out and that is sensed by the catalyst monitor I spoke of earlier.

P0102 - Mass or Volume Air Flow Circuit Low Input
Faulty mass air flow sensor
- Dirty mass air flow sensor (located in the air intake hose to the engine from the air cleaner)
- Dirty air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks

Nov 02, 2012 | 2003 Buick LeSabre

1 Answer

New 02 sensors but still have codes


massair flow meter or drawing air which confuses 02 sensor cos of wrong air fuel mix

Feb 15, 2012 | 1999 Kia Sportage

3 Answers

Readings on my 2003 Toyota 4 cylinder ck engine soon is P0128, P0420, P0430.. what could it be. Should I change thermostat, 02 sensor or catalytic converter.. Please advise.


PO128 = It is probably a bad ECT (engine coolant temp) sensor. PO420= The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail.PO430= Catalyst System Efficiency Below Threshold (Bank 2) Your CAT converter is not cleaning properly. Hope this helps, James Booth

May 17, 2011 | Toyota Highlander Cars & Trucks

1 Answer

2002 toyota rav 4 / code po420 whats wrong ?


You have a cat converter ie eficiency code. Most shops are willing to sell you a cat converter and make a quick buck. However you can save some major money if you can find out what is wrong. A cat converter doesn't just go bad by itself something causes it to fail. Most likely a bad oxygen sensor or a dirty mass air flow sensor. I would replace the oxygen sensor in front before I replace converter. Reset check engine light and see if light comes back on. If it stays off you just save about 600 dollars. Oxygen sensors cause cat converters to go bad. So fix the cause first, then if you have to replace converter.

Oct 28, 2010 | 2002 Toyota RAV4

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

3 Answers

Trouble codes PO174,PO401,PO420 NEED TO FIX SO I


P0174 means Fuel Trim too Lean (Bank 2)

P0401 means Exhaust Gas Recirculation Flow Insufficient Detected

P0420 means Catalyst System Efficiency Below Threshold (Bank 1)

Visit http://www.troublecodes.net/OBD2/

and Visit www.repairpal.com

Sep 28, 2009 | 1999 Ford Contour

2 Answers

Fault code po420 ; is problem sensors or is it the cat conv


The only thing that will set this code is the catalytic converter or the oxygen sensor behind it. Way to tell if it is the sensor is to monitor voltage reading with scan tool and see if it is fluctuating the same as the upstream oxygen sensor. If it is the converter is "free flowing" and will have to be replaced. If the sensor is "flatlined" then it is most likely bad and setting the code.

Apr 30, 2009 | Ford Fusion Cars & Trucks

1 Answer

The code PO420 came on for my 2000 Toyota Camray ......


Catalyst Effeciancy below threshold (Bank 1) is the code meaning. Check or replace the oxygen sensors. Some cars have 2 .One is on the front of the cat. the other is the on the back. Check the back sensor . Other possible causes are leaking or damaged exhaust manifold, bad coolant temp sensor.If toyota did not replace both . replace the one on the back of the Caty.

Feb 02, 2009 | 2003 Toyota Corolla

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

162 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

74945 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...