Question about 2000 Toyota Corolla

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Check engine light with error code 304 on a 2000 toyota corolla

I have reset the computer several times but after 50 to 200 miles the check engine light come back on. I have replaced spark plugs and the coil, and even tried some fuel injector cleaner in the gas. None of this has helped. Any suggestions would be appreciated!! Also I discovered a diganostic port under the hood just in front of the brake fluid reservior.
Does this provide more info on engine problems, and is there DIY readers available for this port. Thanks

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  • mdjochen Mar 01, 2009

    OSB ll reader shows code 304. My owners guide says this indicates a misfire on cylinder 4. The reader cycles 3 times then cancels the code and resets the computer. The reader did ocassionally show a code 300 (random misfire) along with the 304 code before I changed the spark plugs. Does this help with possible solutions? thanks

  • scott carlson May 11, 2010

    do you know what the code is for the check engine light?

    Are you resetting the computer with an OBD II scanner?

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5 Suggested Answers

slfowler29
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SOURCE: 2001 Toyota corolla hesitates on acceleration

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust).

Posted on Mar 27, 2009

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SOURCE: 2001 toyota corolla check engine

Mass Air Flow sensor! Just remove your air filter cover. Go to Auto Zone and purchase some solvent. Spray past the air filter and it should correct the problem. If not, replace the Mass air-flow sensor. This is commonly mistaken for an oxygen sensor. Mine did this and I followed these steps and it fixed the light. BTW, the light stayed on for 5 years before I fixed it. Never hurt anything. It's normally something to do with emissions. Dummy lights. :)

Posted on Mar 30, 2009

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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

  • 1 Answer

SOURCE: 2005 Toyota Corolla CE P0741 error code.

I have a 2005 Toyota Corolla. Yesterday, the check engine light came on. I thought the car was running fine. Later, I noticed the car would **** when the auto transmission shifted from 1st gear to 2nd gear. I also noticed when the car was in the Park position and I put it into Reverse, it would **** backwards. The vehicle has 49,200 miles.

Thanks

Terry

Posted on Nov 08, 2009

nvannoy
  • 234 Answers

SOURCE: 1993 toyota corolla, problem no spark to spark

Check the ignition relay and all the main relays on the battery.

Posted on Jan 06, 2010

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