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May possibly be: Bad or clogged fuel injector, or needs tune-up. (Bad spark plug, ignition wires, cap and rotor), May need a new gas cap, may need new airfilter and PCV-valve. May need fuel system flush. May need fuel filter.

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Q: Why is it that I replaced the knock sensor and the CO2 sensor and the service engine lights still shows on my 1999 Nissan quest?
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