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Changed air pump and check valve mounted in hose by pump. All hoses are updated and in good shape, no deterioration or rub through. Code returns in 2 or three days of driving. Could the oxygen sensor be faulty, even though that's not the code read. The oxygen sensors are original 180K kilometers. If it is the O2 sensor, should I change upstream and downstream?

Vehicle: 2001 GMC Jimmy SLT 4.3 (W) 4X4

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