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Those two codes go hand in hand a lot. If your car is not running correctly (tune up time, dirty air filter) you may get excessive ping. The knock sensor detects this and retards your ignition, making it run rich which causes your 02 sensor to go out of range, throwing the 02 code as well.
Make sure your car is in good running condition first. Check your plugs, air filter and gas filter. If everything is in good shape, change the knock sensor first. Your 02 error code will probably go away after that and you'll be shocked at how much more power you will get.
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99 SE LIMITED - A few changes here and there but most of all SPOTLESS!
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