To install the O2 sensor on a 1998 Lexus LS 400, first, locate the sensor; there are typically two, one before and one after the catalytic converter. Disconnect the battery, then unplug the old sensor’s electrical connector and use a wrench or O2 sensor socket to remove it from the exhaust pipe. Install the new sensor by threading it into position, tightening it securely, and reconnecting the electrical connector. Finally, reconnect the battery and check for any warning lights or codes.
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