I have a 1999 civic that occasionally hicups while driving and has slight idle problems.

I took it to autozone to have it analyzed I have a print out with codes:

P0505
Idle Control System Malfunction

P0135
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

I have no idea where to start with the first code. Anyone have any suggestions to what the larger problem may be other than the O2 sensor which I will replace when the part arrives.

Thanks

 

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MORE THAN LIKELY, the Idle air control motor is either filthy and needs to be cleaned, or its defective and needs to be replaced.

I am assuming that since its a "slight" idle issue, that its merely dirty.

The IACV is a little motor that sits on the side of the throttle body that controls the passage of air past the throttle body itself.

Hope that helps.