HElp check engine codes, what do they mean?

[95rsender]

OK the day before yesterday my check engine light came on and I used the on off on off on trick to get 3 codes out of my car (dont know how i got 3 all at once but el well) anyways if anyone could tell me what they mean and how to fix them it would help a lot, the codes are 12, 21, and 55. thanks,

 

[dave2953]

I'm looking these up now......Code 12 is the Volume Airflow Sensor, the book says to check the connector, and if it's normal then just replace the sensor. Code 21 is the Coolant Temperature Sensor, This could be causing you to get a faulty reading on the temp. gauge. I've spent the last hour looking for a code 55 on your car. I don't seem to be able to locate it, but it could just be that I'm tired. Hope this is helpful