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Assuming you mean P0171, it is a lean condition Bank 1. If the engine is running okay I would look for a vacuum leak around the engine, maybe a vacuum hose disconnected or cracked. If the engine is running poorly it could be a plugged fuel filter, a faulty fuel pressure regulator or a faulty fuel pump.
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What causes the knock sensor code?
what causes the knock sensor code on a 2002 Kia Spectra. Thank You sreddish@neo.rr.com
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