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I wanted to give you guys an update on my car. I pulled the air filter and it wouldn't pass the light test if you were holding it against the sun. It has the Chrashler logo on it so could it be...an original air filter with 90K on it? Also, I checked my trouble codes and got 51 twice (why twice?). I know that means O2 sensor but does that mean I need to replace both of them? At $65 a piece that runs into some change.
 

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O2 sensors will do it. pretty guarenteed.
 

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You have at least 2 o2 sensors, maybe 4 depending on what year your car is. Are you sure it said 51 twice? Maybe it does mean both are bad. Not sure about that. But definately start replacing them. Make sure you disconnect your battery while doing it so that you reset the computer.
 

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While your rooting around for the o2 sensors you should do plugs, wires, fuel filter and a tranny service while your at it. That poor neglected trep will thank you for it. :)
 
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