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ya i would say the control box is bad...i'm pretty sure the o2 sensors last about 300hrs...they just get more inacurate with time and use....switch out the box and you should be good...

 

so i *just* have to buy a new box....come on people chime the **** in!

 

Talk to PLX about your problem. Maybe they'll stand behind their product and take care of you.

 

yeah but that means waiting till monday to call them.

 

you said the box is only 3months old...it probably has a warrenty...so call them monday..i looked at their site...i got this from my plx-m300 manuel------PLX Devices Inc. shall not liable for direct, special, incidental, or consequential damages resulting from any legal theory including, but not limited to, lost profits, downtime, goodwill, damage, injury to persons, or replacement of equipment and property due to improper installation, integration and/or misuse of any PLX Devices Inc.’s product(s). PLX Devices Inc. warrants all products to be free from defects for 90 days from the date of purchase. Parts returned must be determined by PLX Devices Inc. to be defective before any warranty credit or replacement is issued. PLX Devices Inc.’s obligation under warranty shall be limited to repairing or replacing, at its option, any part proven defective.------i would give them a call maybe they can help you out