ANSWERS: 2
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What codes were you getting, did you check the wiring or test the components individually before replacing them, what codes do you currently get...need more info. OBD-II codes are a tool, not a "Replace this sensor". Problems are very often wiring issues causing erronious readings from a perfectly functioning sensor. You'll go broke pretty fast if you just swap out any sensor that the codes mention.
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You might want to have the Catalytic converter checked also. It could be partially blocked.
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