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Crankshaft Position SensorMy wife limped home tonight in her 2004 Subaru Impreza WRX STi. She said that the "CHECK ENGINE" light was on and that the "CRUISE" light kept flashing. I plugged the OBD II AutoScanner into her card and read the following three codes. P0335 P0345 P0340 That is really freaking me out. I can understand that a sensor had failed, but to have entire circuit fail means a much bigger problem. What could it be? Chieh Cheng Searched for "p0335" sti on Google and the first forum thread that turned up was this one: That thread claimed it's a bad battery, because the sensor circuit requires a solid 12 volts to operate. That's possible, because I have in the past month or two installed a light-weight battery into the STi. And now it is just starting the coldest part of winter in Southern California. See this article: Chieh Cheng Well, I've been driving the car for over a week now. It looks like it has nothing to do with the battery. The first night I took it out and I found that the engine timing seems to be off (mis-fire). But when I get up to speed, it's alright. I brought the car home and unplugged the battery for the night. The next day, I noticed that the rear passenger tire seems to be a little flat. I checked and found it completely flat. It had 0 PSI. The other rear tire had 25 PSI, which is quite low compared to the 30 PSI recommended. I pumped up both tires to recommendation and went out for a spin. The mis-fire is complete gone. The check engine light never came back. I had a feeling that the complete flat tire caused the LSD to slip and the DCCD to sense "slippage" due to the different rotation speed, forcing it to transfer power to different wheels. This transfer of power is probably the lag I felt. Currently, the passenger tire is losing 5 to 7 PSI every day and a half. Every morning I pumped it up to spec before I drive it. No problem with the car so far. I pulled the tire off and found the inside side-wall bulging. Probably from driving on flat for so long. Looks like it will have to be replaced. The Bridgestone Potenza RE070 225/45ZR17 is going to cost $197 from Tire Rack. Chieh Cheng
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