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goodboyWRX 03-18-2010 05:29 PM

cel fix advice
Every now and then my car refuses to start. No cranking, no noise, nothing. I keep trying and it eventually starts and throws a code for crankshaft position sensor malfunction. Now the cel is stuck on and its also throwing a code for heat 1 bank 1 whatever. Front o2 sensor is shot. I was planning on replacing my stock uppipe anyway so I was thinking I would buy a catless one without an o2 bung and do the resistor mod. I don't know if the crankshaft position sensor led to the o2 failure but recently I've been getting atrocious gas mileage, like it used a half of a tank to go about 60 miles. Anyone ever have a similar problem? Thanks.

man show 03-19-2010 08:15 AM

Did you try cleaning your MAF sensor? Check your air filter? Spark plugs? Left unattended, those can also lead to poor gas mileage.

RcrsWetDream 03-19-2010 08:29 AM

1 Attachment(s)
Also could be a bad O2 sensor telling the ecu your car has no air left and has it dump fuel to compensate... Change out the sensor and see if that helps.

goodboyWRX 03-19-2010 10:11 AM

replacing the o2 sensor this weekend hopefully. will definitely check/clean the intake system and plugs.

sivart08 03-19-2010 06:52 PM

i have almost the same problems... my car wont start sometimes.. does the same thing.. and i have a check engine light. auto zone said it was the o2 sensor.. i need to get one too.. do you have any problems with jerky driving???

slvr04wrx 03-19-2010 08:36 PM

when my o2 sensor went three or four months ago my gas milage was horrible, and randomly would start bucking throughout my drive.

man show 03-21-2010 09:15 AM

Might be a dumb question, but how long do O2 sensors normally last on WRX/STis - stock, partially, and/or fully modded? How many miles do you guys have on your cars?

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