Today, I noticed a Service Engine Soon light just after my car stopped running for several minutes. I thought that it was "low oil" or dirty air filter. I needed an oil change so I got one. Air filter was a little dirty so I didn't replace it. After the oil change, the light came back on and was on for a few minutes. I stopped the car for about 5 lines and restarted it and then I noticed the light was not on. So, I proceeded to Auto Zone to get a free check engine test. The result- Number Crossed - PO340 The Auto Zone print out states" The PCM has determined that a malfunction exists in the electrical circuit for the camshaft position sensor "A". (Bank 1 or single sensor) (bank 1 identifies the location of cylinder #1, while Bank 2 identifies the cylinders on the opposite bank). The car has about 91,000 miles. How good is the ODB II auto scanner? If the light stays off, when will the Service Engine soon light return? If I take this car to get fixed, about much will it cost to get fixed? Is there something else, I should test?
thanks