Question about 2003 Toyota Corolla

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Check engine light on

My check engine light has been on for at least a week. I took it to a mechanic and they said that i needed to replace O2 sensor bank one. I am unsure of that. I need to know what to do. Can i take the car to auto zone to see if they can read the numbersfrom the check engine light. Let me know

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Usually Engine check indicator will not malfunction. So you better take it to the authorized service station to check for the issue.

Posted on Jul 28, 2009

  • shameer ahamed
    shameer ahamed Jul 28, 2009

    Usually Engine check indicator will not malfunction. So you better take it to the authorized service station to check for the issue.

  • shameer ahamed
    shameer ahamed Jul 28, 2009

    Usually Engine check indicator will not malfunction. So you better take it to the authorized service station to check for the issue.

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All auto parts store have been slapped for perfoming this service. I code does not indicate a defective part which is all the parts store can sell you. Alot of times the code will only suggest that something is affecting the signal to the computer. This is why a diagnoses is important. If the shop just read the code and did not diagnose then you or they may just be throwing parts at this.
Bottom line. Find a repair shop you can trust. Cars cost money to maintain. If your looking for cheap way out you could be costing more money in the long run. With a bad 02 sensor you are stressing the catalytic converter to the point it is getting worn out fast. When it wears out enough it will set a code and you will have to spend hundreds to replace it.

Posted on Jul 28, 2009

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To confirn your mechanic is correct take it to Auto Zone they will read the codes and confirm for you you are right it doeasn't hurt to get a second opinion, The term bank one refers to the Oxygen senson that is before the catalytic converter, the sensor on bank 2 rarely goes bad its function is merely to confirm the catalytic converter is functioning properly, bank 1 sensor tell the computer how to adjust the fuel injector's air fuel mixture. If the auto zone OBD II code reader say bank one O2 sensor replace the sensor you need a large open end wrench to unscrew it sometimes they come out easy and some they come out hard if hard you may need to heat it with a torch to get it turning, if you have some mechanical ability you can do it yourself.

Posted on Jul 28, 2009

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