I recently cleaned my engine with some cleaner and washed it off lightly with my power washer. I followed all the directions like stated but now im getting codes 0303 and 0503, which are both bank o2 sensors. I dont see how I could be getting these codes besides water getting in the connector, and I checked and its dry...I even used wire dryer and still getting the codes. If I clear the codes, they come back within 5 minutes of driving. Any ideas?

 

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ttt...12345678

 

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The car's computer will have to perform a drive cycle before it would throw the codes again. Just reset the computer, and take a nice drive for about an hour on an expressway. I believe that the front O2's only affect drivability below 3000rpm, so when you're driving stay in 5th gear or overdrive. Check the group deal forum, I think there is still a G/D going on for O2's http://forums.maxima.org/showthread.php?t=289189 or you can order direct from www.oxygensensors.com if you don't want to wait. Sorry, I don't have an answer for you as to why the codes suddenly appeared like that.

 

Codes are still comming up after multiple drives and resets

 

Check the wires for the sensors, if they appear to be ok...time for new O2 sensors.