Question about 2003 Toyota Matrix

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My 2003 toyota matrix has a check engine light which gives me a code 0420. I have changed both o2 sensors and replaced the plugs and it stll comes back. Could a bad coil or cat be the problem?

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Hello and welcome to FixYa!

Yes indeed. It can be a bad coil. This is common on this car specially if the check engine light doesn't go off after the O2 replacement. Have it replaced and I believe you'll be good.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on May 21, 2011

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0420 AND CHECK ENGINE LIGHT STAYS ON


DTC P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
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.

You will likely not notice any drivability problems, although there may be symptoms.

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
******** spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings

Some suggested steps for troubleshooting a P0420 error 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.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 17, 2012 | 2000 Toyota 4Runner

1 Answer

I have P0770 code on my 2003 Toyota Matrix 2WD L4-1.8L (1ZZ-FE) auto XR with ABS. I have couple more questions. I was replaced a ECM already and the P0770 come out after 1 days. I have the R&R Speed...


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

May 31, 2010 | 2006 Toyota Matrix

2 Answers

Check engine light on 2003 toyota tacoma, O2 sensor?


An O2 sensor code is a tricky one. It could mean SEVERAL different things, and I know how bad it sucks to hear this, but your best bet is to take it in and have a diagnostic ran on it at either a dealer or a good mechanic shop with a computer they can hook up to it. I had an "O2" code come up a while back on another car I used to have, and literally spent weeks and hundreds of dollars trying to fix it, and never did. Finally out of desperation took it in, paid the $90, and they found the problem and fixed it in like 30 minutes. Something I would have never even thought of was causing it (can't remember off the top of my head). After that I stopped wating time and money on check engine lights. One comes on in my car, I take it to have it ran for free at and auto parts store just to make sure it's not a loose gas cap or something, just to get an idea of what I'm looking at, then go and make an appointment to have to hooked up to a diagnostic computer to track down the problem. Good luck, and hope this helps save you some time and money.

Apr 03, 2010 | 2003 Toyota Tacoma

3 Answers

03 toyota highlander 57400 miles, oil & filter just changed. The check engine light is on. What could it be?


MANY THINGS CAN CAUSE THE LIGHT TO COME ON THAT LIGHT INDECATES A MALFUNCTION IN THE SYSTEM ITS HARD TO SAY WHAT CAUSED IT WITH OUT HAVEING IT CHECKED GO TO AUTOZONE THEY PROVIDE A FREE SERVICE CHECK ( OBD 2 96 & LATTER) GET IT CHECKED OUT THEN I'LL TELL YOU HOW TO FIX IT

Mar 02, 2010 | 2003 Toyota Highlander

1 Answer

Code p0420


Hello.

Normally, the P-0420 indicates a sensor issue; a cat replacement would be needed if you had the P-0420 coupled WITH a
P-0430 code.

What I would do, if I were you, would take the car to a shop that can perform an "induction cleaning", and have that service done. Then, replace the spark plugs, if the car is around 90,000 miles. You may alsop need a front air-fuel sensor (the one on the manifold) replacement.

I would not change the cat until I did the above services. It does not sound like a bad cat just yet.

Dec 30, 2009 | 2004 Toyota Corolla

2 Answers

I have a toyota rav4 2003 management light came on checked code p1155 oxygen sensor bank1 sensor 2 changed it, cleared code light still,came on again ,changed the other three ,cleared the code again, ran...


The upper sensors are air fuel sensors and the lower ones are o2 sensors. you cant mix these up. Assuming you did everything right and still coding then either the new sensor b1s2 is bad or the wirng(power and ground need to be checked. A scan tool can be used to look at the performance of the sensors too. Sometimes the codes just point to the area of the problem and changing the part isn't the answer.

Nov 15, 2009 | 2002 Toyota Avalon

2 Answers

Toyota Matrix Check engine light is on


Is it a check engine light or Maintenance Required light? If its the maintenance required light, turn the car off, push and hold the trip odometer button while turning the ignition back on. Don't start the car. You'll see five dashes that will count down to none. That'll reset the maintenance required light. Do it after every oil change and it'll come on when its time for an oil change.

Feb 15, 2009 | 2006 Toyota Matrix

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