Hey everyone,

My service engine soon light came on last night so I went and pulled my ecu codes. I got 0304 (knock sensor), 0705 (evap control system) and 0309(undefined). My max has 80000 miles on it and I have 4000 miles left on an extended warranty I purchased when I bought the car used a little over a year ago. I have been trying to think through what could have caused the above codes, and I am curious as to what 0309 is... I am positive that is what it was, as I verified it 3 times. Should I take my car to the dealer, or should I reset my ecu? Being as my car is under the extened warranty I don't see resetting the ecu as a good idea if I am to bring it in, as I could make up a ton of bs and only pay my 100 deductible. Any input would be appreciated, as the yellow light of death starring me in my face everytime I drive my car will drive me to insanity. Thanks everyone.

 

Maybe a vauum leak, maybe carbon buildup in the EGR Valve?

If it's under warranty, take it in.

If they try to screw you, fix it yourself.

Unfortunately there is 0 a person can do when a dealer tries to screw you except fix it yourself.