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Caution:On models equipped with Delco-Loc 2 or Theftlock audio systems make sure you have activation code or lockout feature is turned off * Disconnect the negative battery cable * For access to the downstream oxygen sensor raise the vehicle and place it on jackstands * Follow the harness from the sensor to the electrical connector then unplug the electrical connector from the vehicle harness * Carefully unscrew the sensor from the exhaust manifold

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