They are instrument panel codes, all relevant to loss of data.
Code I033 Loss of SIR Data
Code I034 Loss of PCM Data
Code I037 Loss of ACP Data
Code I039 CCR Signal Fault
It is hard to say what the symptoms would be, and whether you would even notice the conditions for setting these codes, when they occur.
Tuesday, August 18th, 2009 AT 10:36 PM