Engine codes P0420/P0010 I need to know approximately the costs to get this fixe on 2008 Chevrolet Malibu

Had it diagnoise already by OnStar and Auto Zone need to have repaired please give me the amount that it will cost

Asked by for the 2008 Chevrolet Malibu
agree with miles get complete diag and est
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1 more answer
You are just at the begining of diagnosis. Codes tell you what system has a fault. P0010 is a fault detected with Camshaft Position (CMP) Actuator Solenoid Control Circuit.
P0420 is a fault with catalytic converter:Catalyst System Low Efficiency.
I suggest you have the problem P0010 Diagnosed and repaired first. That issue could have set up the conditions for the P0420.