Question about 2003 Toyota Matrix

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My 2003 Matrix sometimes doesn't start at all and sometimes it starts fine, I took it to Autozone yesterday and they checked the battery and alternator and they said everything is working fine. (I took it to a mechanic 4 months ago because there is a check engine light, and he told me that the diagnostic was that the Catalytic sensor was damaged or something like that) so I was wondering if that is what is causing the problem when i try to start the car..

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  • Toyota Master
  • 2,523 Answers

Wonder no longer Gabi_hn,

Your exhaust MUST be open and working for your vehicle to start & run... I will take it a step further and assure you FRESH FUEL can't even get fully into the combustion chamber WITHOUT the free flow of exhaust...!!

2003 TOYOTA MATRIX 1 8L L4 Catalytic Converter RockAuto

2003 TOYOTA MATRIX 1 8L L4 Exhaust System Kit RockAuto

2003 TOYOTA MATRIX 1 8L L4 Muffler RockAuto

You could save yourself some money... all you have to know
is oxygen sensors get very upset about blocked exhaust...
BUT the NEW ones (oxygen sensor) report the same
trouble
just as well as the old ones (my opinion).
More Information for NTK 21547

Hope this helps,

Carnac the Magnificent

Posted on Jun 18, 2017

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  • Toyota Master
  • 1,045 Answers

If the catalytic converter is plugging up or plugged it will not allow the fuel into the cylinders and fire, due to back pressure on the engine. Do a exhaust check on the tailpipe by putting your hand or something over it and see if you have pressure there when the car is running.

Posted on Jun 18, 2017

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Posted on Jan 02, 2017

  • 416 Answers

SOURCE: Toyota Matrix Check engine light is on

Hello
I would assume you need to replace spark plugs and fuel injectors (or try to use injector cleaner liquid). Also check/replace catalytic converter. Check engime lights codes you can read for free in nearest Autozone store. I would assume it either fuel evaporation problem or O2 sensor.
Please kinly let me know if you need more infor
Good Luck

Posted on Feb 15, 2009

2coolrick
  • 560 Answers

SOURCE: Check engine light - catalytic converter problem

If you haven't replaced the O2 sensor that is causing your check engine light to come on by generating a fault code in the ECM, replace it first. Cleaning the Catalytic Converter is not the thing to do. Replacing the faulty sensor will pay for itself in the long run with the better fuel economy you will get.

Posted on Aug 14, 2009

  • 14036 Answers

SOURCE: Help with toyota corolla 2003 code P0420

CODE PO420 CATALTYLIC CONVERTER SYSTEM FAULT.ITS SAYING FAULTY CATALTYLIC CONVERTER.IF IT BEEN A WHILE IF YOUR CAR HAS A WHOLE LOT OF MILES ON IT.YOUR SPARK PLUG CHANGE IS DUE AT 120000 MILES. DUE A LITTLE TUNE UP CHANGE AIR FILTER AND FUEL FILTER.SEE IF YOU HAVE ANY ENGINE FAULTS BAD PLUGS DIRTY INJECTORS ANY THING UP SET FUEL SYSTEM CAUSE CAR TO RUN RICH.EXCESSIVE UNBURN FUEL WILL GATHER IN CATALYTIC CONVERTER CAUSE IT TO BURN OUT.SHORTING LIFE OF THE CATALYTIC CONVERTER.

Posted on Aug 30, 2009

johnjohn2
  • 5763 Answers

SOURCE: 2003 Toyota Matrix won't start. No click when we

yes theres is, try locking and unlocking the pass/side door with the key. you can check for power at the starter at the small wire if theres power at that wire when the key is held in the crank position then you have a bad starter try taping on starter while key is held in start if its starts when tapping then starter is bad,heres a diagram to show you were to tap and where to check for power, hope this helps.4a6e88f.jpg8d713e8.jpg

Posted on Feb 10, 2010

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